At present, the systematic design method and system for regional prevention of rockburst have not been established in the mine design stage. In order to facilitate the design department to integrate regional awareness of rockburst prevention into the main plan of the new mine design stage, and reduce the difficulty and intensity of preventing rockburst during the production period of the mine. This article proposes the steps and methods for integrating regional awareness of rock burst prevention and control into the preliminary design of the mine, including the determination of rock burst tendency in the feasibility study stage of the mine, the determination of production capacity of rock burst mines, the implementation of regional anti-scour concept in the development and deployment of rock burst mines, and the combination of mining sequence and regional anti-scour. Based on the design example of the northern mine in the Hujilt mining area, Provide reference for the regional anti erosion design during the feasibility study stage of other similar newly built rock burst mines.

Aiming at the shortcomings of the traditional method of roadway stereoscopic intersection, based on the analysis of the thin rock stratum of the stereoscopic intersection by using the rectangular thin plate theory, it is considered that the thin rock stratum formed by the roadway stereoscopic intersection can be regarded as the four-sided simply supported rectangular thin plate. The rectangular thin plate is reinforced on four sides to form a four-sided fixed rectangular thin plate, which can greatly improve the bearing capacity and the strength level of the plate. According to the above, a kind of technology of roadway stereoscopic intersection of thin rock stratum strengthened with four-sided fixed plate is proposed, and the composition of design structure and the process of construction control are explained. The scientificness and correctness of structure and mechanism are demonstrated through the analysis of structural characteristics and mechanical mechanism, the adaptability and beneficial effect are proved by field engineering practice. It not only solves the practical problems in the field, and overcomes the shortcomings of traditional roadway stereoscopic intersection, but also applies the theory of four-side fixed plate to the field of thin rock stratum strengthening, and advocates a new kind of method of retaining thin rock stratum and technology of controlling surrounding rock, and establishes the mechanical model of thin rock stratum strengthened with four-side fixed plate, and forms the anchor steel concrete coupling roadway stereoscopic intersection bearing structure strengthened with four-side fixed plate, and realizes the thin rock stratum retaining and bearing.

Abstract：Aiming at the problem of excessive deformation of narrow coal column and roadway surrounding rock under hard roof conditions and strong mine pressure, the parameters of deep hole pre-cracked cutting roof and narrow coal column protection alley of hard roof were studied under the engineering background of Fujiayan Coal Mine 10102 working face return air lane. Through the mechanical reasoning analysis of the roof cutting and protection alley, the roof plate after the roof is cut from the three-sided solid support and one side simple branch before the initial pressure to the two sides of the solid support and the two sides of the simple branch, which makes the roof more likely to collapse and the collapse step distance is correspondingly reduced, which eases the mine pressure of the working face. The key parameters of the narrow coal column protection alley of the cutting roof are analyzed in detail: the width of the coal column, the cutting top angle, the cutting depth of the cutting roof, and the spacing of the cutting top gun hole are the key factors to achieve accurate top cutting, and the vertical cutting depth of 24m completely cuts off the basic top limestone, which effectively reduces the stress connection of the basic roof, shortens the length of the basic top cantilever and minimizes the load of the coal column. The numerical simulation results show that the supporting pressure of the 8m coal column is the largest when the top is not cut, reaching 41.8MPa, and the shaping damage of the coal column is the largest, which will even lead to the failure of the coal column; after the 8m coal column is cut to the top, the supporting pressure of the coal column is the smallest, the peak value is 21.2MPa, and the internal pressure concentration area of the coal column is significantly reduced. The monitoring of the roof cutting effect showed that with the progress of pre-cracking and cutting the roof, the cycle of the return air side bracket was stable and the time was short, indicating that the roof cutting and unloading technology made the structural connection of the roof plate change significantly, and the stress transmission of the basic top was discontinuous, which reduced the load above the narrow coal column and played an effective role in the surrounding rock control of the narrow coal column roadway．

In view of the existing mine water treatment technology and o-phenylenediamine big, long processing time, the problem of the effluent water quality, to conventional mine water pipe micro flocculation - ultrafiltration process test research. The results show that the tube micro-flocculation and ultrafiltration process has good performance in treating mine water, and the turbidity of the effluent is all below 0.07NTU. The removal of particulate matter mainly depends on the screening effect of ultrafiltration membrane, and the type, dosage, tube length and diameter of micro-flocculation coagulant have little effect on the removal effect of turbidity.With the increase of dosage, Zeta potential gradually decreases and approaches zero, and the attenuation degree of membrane specific flux gradually decreases with the running time. When the dosage is 6 mg/L, the decrease of membrane specific flux J/J0 is the smallest. With the increase of pipe length, the decline rate of membrane specific flux is gradually slow, and the pipe length is 20 m ~ 30 m, and the corresponding reaction time is about 20 s ~ 30 s, which is more suitable. The flow rate has great influence on the reaction effect and ultrafiltration, and the flow rate is about 0.9 m/s. With the increase of operating pressure, the water yield increases and the membrane specific flux decreases. Physical contamination (particle blockage) is the main cause of mine water pollution to ultrafiltration membrane, and the best cleaning method is hydraulic flushing; When the diameter of the micro-flocculator is 4 mm, the length of the tube is 20 m, the dosage of PAC is 6 mg/L, and the transmembrane pressure difference of ultrafiltration is 0.18 MPa, the membrane specific flux J/J0 is 0.815 after filtration for 30 minutes, and the water yield is 93.8%.

As an important technological component in the construction of intelligent open-pit mine, the wheel and bucket continuous process system is the core of its development. In this paper, the evaluation system of the actual capacity of the wheel bucket continuous process system is established by analyzing and studying the various influencing factors of the effectiveness of the wheel bucket continuous process system capacity. Using the CRITIC method to assign indicators to each factor; On this basis, a new comprehensive evaluation method of continuous process system based on TOPSIS of discrete approximate ideal solution was proposed. The effectiveness, objectivity and practicability of this method are tested through the practical application of ZhaHanur open-pit coal mine project. Continuous process capability is put forward in this paper the wheel bucket effectiveness evaluation model can objectively reflect the correlation between the evaluation index, is in determining index weight and round in the continuous process effectiveness evaluation on the beneficial exploration and its evaluation mechanism more in line with the actual, the evaluation results more intuitive and accurate, and to improve the wheel bucket has an important guiding significance to the continuous process effectiveness.

The auxiliary shaft tunneling of Tashan Coal Mine belongs to the dangerous zone under pressure. In order to eliminate the potential threat of Ordovician limestone water inrush from the floor during the tunneling process, the water outflow from the borehole of the Ordovician limestone aquifer at the floor of the auxiliary shaft's sump floor are analyzed through drilling design and construction, and then the design and construction of grouting reinforcement is carried out. Finally through the water pressure test before and after grouting to analyze the treatment effect to ensure the safety of the auxiliary shaft. The results show that 17 boreholes are symmetrically and evenly arranged within 30m of the shaft for exploration. The data of borehole water yield, water pressure and water temperature are analyzed in detail. It is concluded that the borehole water yield and water absorption increase from northwest to Southeast, and the water yield of five boreholes in the southeast is greater than 4 m3 / h, indicating that the water yield of Ordovician limestone aquifer in the southeast of the shaft is greater than that in the northwest, and the fracture development in the southeast is stronger than that in the northwest, but except for some boreholes, The water absorption of all boreholes is lower than 0.01 L/min?m?m, indicating that the overall fractures in the exploration area are not developed;The design adopts cement single liquid slurry. The water cement ratio of most boreholes is 3:1, and the slurry concentration is about 1.2 kg / cm3. Some boreholes in the southeast can increase the water cement ratio, improve the slurry concentration, and carry out secondary grouting;From the perspective of grouting volume, the grouting volume gradually increases from the boreholes in the northwest to the southeast. Especially in the five boreholes in the southeast, the grouting volume reaches the maximum, which is positively related to the water yield and water absorption of the boreholes;Through the water pressure test to detect the treatment effect, the water yield and water absorption after grouting are far less than those before grouting, and the water absorption after grouting is less than the standard value of 0.01 L/min?m?m, which meet the required grouting completion standard, indicating that the cracks in the coal seam have reached the role of filling, reinforcement and plugging.

Before the development of the old mining areas, it is necessary to use geophysical methods to detect the small coal goafs left in the mining area. Usually, private small coal mines are not large in scale and shallow in depth. If it is located in mountainous areas, some of geophysical methods will be difficult to lay out long survey lines due to the influence of topographic relief, resulting in certain limitations. In order to realize the accurate detection of shallow private mining tunnels under mountainous areas, firstly, we discussed detection effects of three common devices of ERT on low-resistance abnormal bodies by numerical simulation. Then, the response characteristics of small-loop TEM to good conductors at different distances are studied by physical simulation. Finally, in field experiments, the above two methods were combined to detect shallow private mining tunnels in Zhijin County, Guizhou Province. The experimental results show that small-loop TEM can overcome the problem that ERT is not easy to arrange long lines in mountainous area, and ERT can make up for the shortcomings of TEM shallow detection blind area and insufficient resolution. In the process of detecting the private mining tunnels, TEM can be used for preliminary detection to provide some geophysical information. Based on this, more short ERT lines with higher resolution is laid out to accurately detect the tunnels, and TEM inversion data can be corrected with the ERT resistivity data and achieve more accurate results. The combination of the two methods reduces the limitations of only single geophysical method in the interpretation of inversion results, and provides a reference for the accurate detection of geophysical methods in the shallow private mining caves of small coal mine.

In view of the problems of serious destruction of side support and large deformation at the side of gob side entry retained by roof cutting, the structural model of surrounding rock of gob side entry retained by roof cutting is established, and the movement characteristics of roof strata and the stress process of side entry support are theoretically analyzed. Combined with the engineering practice, the rigid flexible combined support technology and process flow at the side of roadway are proposed, and the following conclusions are drawn: Based on the principle of roof cutting and roadway retaining technology, the movement process of roof strata is divided into rapid collapse stage Bending subsidence stage and compaction stability stage; In different stages of migration, the roadway side support body experiences dynamic impact, longitudinal compression and lateral compression respectively; According to the analysis of the roof movement law and the stress characteristics of the support, it is required that the roadway side support should have the ability of instantaneous impact resistance, longitudinal shrinkage and lateral compression resistance at the same time; By laying steel wire rope + metal mesh on the hydraulic support of the mining face, and setting retractable U-shaped steel + reinforcement mesh behind the support, a rigid flexible combined support body is formed, which can effectively reduce the deformation and damage of the roadway side support body.

Aiming at the problem of the large deformation of surrounding rock of deep high stress roadway, the main transportation roadway in the tenth mining area of Shuiyu Coal Industry Co., Ltd. was selected as the research object, combined with field investigation, theoretical analysis and field test, The failure characteristics of surrounding rock and supporting structure of deep high stress roadway, the internal structure and strength characteristics of roof and two sides were analyzed, and the main influencing factors of large deformation of surrounding rock of roadway were studied. Based on the research results, a combined structure including grouting, bolting, concreting and supporting with confined concrete support and grouting anchor cable as the core was proposed, the industrial test was carried out on site, which effectively guaranteed the stability of surrounding rock of deep high stress roadway, which has a certain reference value for the control of surrounding rock of roadways with similar conditions.

In view of the bottleneck of coal seam gas fire prevention and control collaborative control technology faced by roof cutting and pressure relief technology under complex geological conditions of outburst and spontaneous combustion coal seam, taking 3402 working face of Shaqu No.2 Coal Mine as the research object, the key technical parameters of roof cutting and pressure relief under complex geological conditions of outburst and spontaneous combustion coal seam are studied by combining theoretical analysis, numerical simulation and field engineering practice, This paper analyzes the distribution characteristics of stress and displacement field of surrounding rock of roadway under this geological condition, and explores the cooperative prevention and control mechanism of coal seam gas and fire prevention under this complex geological condition. The research results show that when the cutting angle of roadway is 15 ° and the length of cutting seam is 6M, the stress peak value in the stress concentration area of solid coal side after pressure relief is the smallest, and its size decreases by about 56.25%, and at this time the roof rock mass is stable The displacement is the smallest. After spraying polymer plugging material to the retained roadway section, the gas flow passage in the goaf was cut off in time, and the gas concentration in the return air flow was stabilized at 0.36% ~ 0.41%. After optimizing the design parameters of roof gas drainage borehole and goaf buried pipe, the average gas drainage concentration in the goaf was 6.1%, and the average gas drainage purity was 3.1m3/min, which realized efficient gas drainage in the goaf. After spraying atomization inhibitor into the goaf, no CO gas, ethylene, acetylene and other spontaneous combustion symbolic gases were detected, which greatly reduced the risk of residual coal spontaneous combustion, formed the prevention and control idea of "prevention first, combination of prevention and elimination, high coordination" under complex geological conditions, and the collaborative control technology of plugging (tenable), pumping (obtained) and injection (effective), which alleviated the risk of coal spontaneous combustion This paper analyzes the contradiction between gas and fire control in roof cutting and pressure relief roadway under the condition of outburst and spontaneous combustion coal seam, and provides theoretical reference for the maintenance of the same type of roof cutting and pressure relief roadway.

The difference of coal mine geological occurrence and mining conditions makes it difficult to find a unified occurrence mechanism and prevention strategy for coal bump, and a reasonable classification of coal bump mines will be a feasible path to support the effective development of anti-coal bump work in the engineering site. Based on a large number of field investigations, this paper analyzes the structural characteristics of each coal field in Inner Mongolia and Shaanxi mining area and its influence on coal bumps. It is concluded that the Zhungeer coal field, Dongsheng coal field, Zuozishan coal field, Shanghaimiao coal field and Shanbei jurassic period coal field Inner Mongolia and Shaanxi mining area face a different degree of risk of rock burst. Considering the occurrence mechanism of coal bump, disaster location, load (force source), mining environment and other factors, typical coal bump mines are divided into gravity type, structural type, roof type and coal pillar type. The classification method of coal bump mine types in Inner Mongolia Shaanxi deep mining area is put forward. Combined with the formation mechanism of each type of rock burst, the corresponding prevention and control key points are clarified. clear the corresponding prevention and control points. This provides a reliable means to support the design of specific measures for the mine's anti-scour work, and the engineering practice of coal bump prevention based on it has achieved good results.

In order to explore the prevention and control technology of rockburst in deep buried composite coal pillar working face, taking the 21201 working face of Hulusu Coal Mine as the engineering background, the distribution of the stress state before and after the formation of the composite coal pillar working face was studied, and the combined measures were proposed, and the effect was tested based on the change law of microseismic events before and after the combined pressure relief and erosion prevention measures. According to the analysis results, technical measures for joint pressure relief are designed. Affected by the superposition of the advance abutment pressure of the mining face and the lateral abutment pressure of the adjacent goaf, the composite coal pillar area will not only cause high stress concentration, but also easy to produce a large amount of energy accumulation. After the combined pressure relief, the daily average frequency and daily average energy of microseismic events have decreased by 71.7% and 75.6% respectively. The microseismic events above 103~104J have been significantly reduced and their spatial distribution is relatively scattered, which indicates that the combined pressure relief measures taken have significant effect and can effectively reduce the risk of impact.

The coal seam in Yunnan-Guizhou area is usually a multi-layer overlapping structure, which does not have the conditions for pressure relief mining of the protective layer, and the cross-layer drilling extraction efficiency is poor, so the coal seam penetration measures are urgently needed. Controlled shock wave is a new type of coal seam penetration technology, which has been well applied in northern China. In view of the coal seam problem in Yunnan-Guizhou area, the C7+8 large coal sample of a coal mine is used as a shock wave for energy optimization experiment; the overlapping operation mode and operation parameters of "coal seam penetration" and "rock seam precracking" are designed, combined with drilling and coal seam conditions are used, and the pilot test is carried out. The results show that: 30kJ energy rod is used for coal seam penetration, and 80kJ energy rod is used for rock seam precracking. The extraction concentration of borehole 5 in the coal rock junction was increased by 16.2 times, and the pure extraction volume was increased by 15.8 times, which was 2.8 times higher than that of the conventional cross-seam drilling hole. In the later period, the overall concentration and flow of borehole 5 increased in the later period, which showed that the cross-impact operation was balanced in the middle of the coal seam and the junction of the coal rock. This research result laid a foundation for the deep development of coal seam in complex geological conditions in Yunnan-Guizhou area.

In view of the problems of thin coal seam thickness, soft coal seam, high gas content and high gas pressure in faer coal mine under the condition of complex stratum floor, through the analysis of coal seam occurrence state and geological conditions, combined with field drilling detection test, the branch hole layout design and construction scheme based on comb directional drilling technology are studied, The location of each branch point of comb directional drilling and the reasonable spacing of branch holes are determined to be 24 ~ 36m, and the directional drilling technology of floor comb directional drilling under complex formation conditions is formed. The field test application was carried out during the excavation of + 980m horizontal belt extension roadway in Fa'er coal mine. A total of 7 boreholes were constructed, with a total of 45 branches. The average gas drainage concentration of a single hole was 26.64%, and the average gas drainage purity of a single hole was 0.33m 3/ Min, the gas drainage effect has been significantly improved. Practice has proved that the application of this technology can effectively control the upper and lower exposed coal (coal seam groups) in the roadway excavation contour under complex geological conditions, and provide a certain theoretical support and technical reference for similar working faces.

As a power source, ordinary explosion-proof large-capacity lead-acid batteries in China have been widely used in underground explosion-proof lead-acid battery scrapers and support trucks, but there are some problems, such as too long charging time, the need to manually add distilled water regularly and the inability to realize intelligent management. In this paper, the mine special valve-regulated lead-carbon lead-acid battery with capacitance characteristics is applied to the explosion-proof heavy-duty electric drive car, which can shorten the charging time to about 1/5 of that of the ordinary lead-acid battery, and at the same time reduce the labor maintenance cost. Through multi-sensor fusion technology, an online monitoring and intelligent expert management system for explosion-proof battery is constructed, which can remotely monitor the real-time state of the battery, especially can find out the causes of battery failure and give an alarm in advance, prolong the service life of the battery pack, which is conducive to the further popularization and use of underground electric-driven trackless rubber tires

Team is the most basic unit of mine and it’s construction is the key to improve the level of coal mine. Based on the mismatch between management efficiency and intelligent equipment level, four team construction connotations were clarified including a comprehensive and standardized basic management system,a management system of daily maintenance and timely maintenance of equipment, a standardized operation process focusing tasks and safety and a coal mine risk warning push from the consideration of man-machine-operation-risk. Technical path of mine intelligent team management system was introduced, and the key processes including information flow, infrastructures, method model, function application and system terminals were proposed. Key technologies including team assessment and evaluation method based on Delphi and analytic hierarchy process, position-operation matching system based on relational database and multi-system linkage information push method based on cloud-edge-device integration were designed. Finally, the PC and mobile terminals of the unified centralized smart team management system were developed and successfully applied in the team of Mindong No.1 Mine.

In order to further study the roof fracture mechanism of pitching oblique comprehensive working face in steeply inclined coal seam, taking N2821 fully mechanized working face of Fengchun Coal Mine as an example, based on the thin plate theory, considering the influence of coal seam angle and working face angle on stope, a model of elastic thin plate on basic roof of pitching oblique comprehensive working face in steeply inclined coal seam is established. The equation of roof deflection and deformation of subducted pseudo inclined working face is obtained. The stress distribution characteristics of the main roof of the pitching oblique comprehensive working face under the influence of two angles are further analyzed. Moreover, the initial and periodic fracture distances of the main roof are theoretically calculated to be 13.7 m and 7.9 m, respectively.The maximum deflection point of the working face is located at the lower end of the middle part of the working face and the characteristics of ‘?->’ type initial fracture and ‘c->’ type periodic fracture of roof in steeply inclined coal seam are revealed. The research results provide a certain theoretical reference for the control of coal seam roof in steeply inclined working face.

The intellectualization of the fully mechanized mining face is a very attractive field, and mine pressure prediction is an important part of realizing the intellectualization of the fully mechanized mining face, which has a wide range of application scenarios. The hydraulic support load is a direct reflection of the overlying rock movement of the fully mechanized mining face, and the end-cycle resistance of the load peak is a key indicator for judging the pressure from the roof and carrying out the prevention and control of the coal mine roof, water, and fire disasters. In this paper, the change of resistance at the end of the cycle is predicted to characterize the occurrence of rock pressure, and a set of support data quality optimization methods based on regionalization, roof pressure prediction model construction based on space-time fusion, and multi-scale deployment method systems are formed. The experimental results show that the Conv1d+Bi-LSTM temporal-spatial model combined with the attention mechanism can effectively extract the characteristic information of the working condition matrix of the hydraulic support, and the data optimization method for different situations improves the prediction accuracy of the model, and the model has good robustness With generalizability, accurate prediction of mineral pressure can be achieved. The multi-scale deployment method realizes the flexible deployment of the model, which is of great significance for practical prediction.

The strong-weak coupling outburst prevention technology is an effective method to prevent coal and gas outburst by using hydraulic punching to weaken energy absorption and grouting to strengthen resistance. In order to study the mechanical characteristics of strong-weak coupling structures with different strength combinations, MTS uniaxial mechanical loading experiments were carried out on 9 coal-rock combination samples with different strength combinations, and the loading process was monitored using acoustic emission monitoring system. The results show that the increase of rock mass strength can effectively enhance the overall bearing capacity of coal rock combination, and enhance the ability of strengthening area to resist residual energy; The increase of coal strength can effectively reduce the overall deformation of the sample, shorten the duration of the compaction stage, and reduce the degree of partial coal fragmentation. The research results are of great significance to the optimization design scheme of strong-weak coupling anti outburst technology. Key Words：coal-rock combination; strong-weak coupling; coal and gas outbur

Visualization of complex geological structures can provide guarantee for safe and efficient mining of coal resources, and is also a hot research topic in the field of coal. Taking the 3103 mining face of Mataihao coal mine in Ordos as the engineering background, this paper puts forward a construction method of fault structure visualization platform, which mainly includes three steps of three-dimensional interpolation of multi-physical field data, geological modeling and data in-situ restoration, and the visualization of fault structure and rock pressure characteristics are realized. The research results show that there is a fault running through the rubber transport channel obliquely at 1170m from the cutting hole in the 3103 mining face of Mataihao coal mine, and the visual platform visually shows the shape and distribution of the fault. When the mining face passes through the fault, the distribution of rock pressure is extremely irregular. The interval of periodic pressure is 45.9% lower than the average value of normal mining, and the duration of pressure is 70% higher than the average value; The pressure distribution of the hydraulic support along the inclined direction of the mining face is relatively uneven, and the pressure value of the support near the fault side is small. The pressure of the working face is generally distributed in an "n-type" line with the fault plane as a valley. During normal mining, the pressure is relatively uniform and distributed at intervals.

Well water level is one of the important means of underground fluid observation in seismic geophysical field. The water level of Menyuan observation well began to rise greatly on September 24, 2019, reaching 6.85m, then decreased about 4.5m, and finally remained at a high water level about 2m above the normal background water level. Since January 8, 2022, the Menyuan Ms6.9, Delingha Ms5.8 and Ms6.0 earthquakes have occurred successively in the Qilian seismic zone. In order to explore the relationship between the two-stage abnormal changes and the earthquake, regional hydrologic survey, geochemical analysis and other methods were used to analyze the abnormal changes of water level in Menyuan well, and it was found that: The abnormal change of water level of Menyuan well since September 24, 2019 is influenced by the loading of regional stress and the seepage of reservoir operation. Then the stable high water level is the abnormal response of strong earthquake breeding process in Qilian seismic zone. With the occurrence of Ms6.9 earthquake in Menyuan, the water level gradually returns to normal.

Close first for the study of coal mining working face of weak rock deformation characteristics, to Xiong Jiawan coal mining face 20903 working face as the research background, based on the numerical simulation, theoretical analysis and field observation analysis close initial mining work face weak (C8) coal seam of coal and rock fracture, the stress changes and the characteristics of expansion deformation, etc. The results show that the fractal dimension of cracks rises steadily, rises rapidly and falls rapidly before and after the coal failure deformation, corresponding to three stages of failure deformation of C8 coal seam, from fracture generation to fracture stable development, from fracture stable development to bending subsidence, and from bending subsidence to fracture compaction. The first working face changed the maximum principal stress value and area of C8 coal seam, resulting in the failure and deformation of C8 coal seam. The expansion deformation of C8 coal seam shows the law of compression → expansion → stability. The maximum expansion deformation values of C8 coal seam are 12.1 and 11mm, which are located in the pressure relief expansion stability zone. According to the field observation, the weak coal and rock of C8 coal seam are stable as a whole, some coal and rock have broken fracture zone, and some roof rocks have become loose, which has no great influence on the stability of rock strata. The research results can provide reference for the first mining face with similar mining conditions.

Aiming at the key problems such as severe overburden failure, unclear surface subsidence law and difficult control of surface collapse in fully mechanized caving mining of extra-thick coal seam, taking F6207 and F6211 working faces of Bulangou Coal mine as research objects, the vertical subsidence processing using TSX and Sentinel-1 data was carried out by multi-source observation fusion. The subsidence range of the working face is calculated by migration tracking, and the deformation field of the whole working face is obtained. Calculated according to the scope of the surface deformation range and underground mining based on InSAR Angle, the influences of multi-source monitoring short-term dynamic mining based on multiple information fusion technology of multidimensional surface subsidence monitoring system, break through the conventional single cloth surface movement observation data in "spot" or "line", the limitation of boundaries and accurately identify the subsidence area, The monitoring accuracy of surface residual deformation is effectively improved, and the problem of surface subsidence and overburden failure law measurement of extra-thick coal seam with high intensity mining in loess gully region is solved.

With the rapid development of the coal industry, the cantilever roadheader is widely used in coal mining. In the cutting process of the roadheader, the wrong selection of the structural parameters of the cutting head and the cutting motion parameters will not only accelerate the wear of the cutting head and reduce the life of the pick, but also reduce the reliability of the operation of the roadheader. In order to reduce the wear of picks and improve the cutting efficiency, based on the theory of coal cutting by picks, the stress state of single pick cutting process is analyzed, and the random load spectrum function of single pick cutting load and cutting head cutting load under yaw condition is constructed. Based on the theory of active vibration assisted rock breaking, a mechanical model of pick rock breaking process under vibration excitation force is constructed. By building a cutting test bench, the cutting load experiments with or without excitation and different excitation frequencies were carried out. The results show that the active excitation reduces the cutting load of the cutting head during the cutting process and reduces the impact damage to the cutting head. There is no linear relationship between the excitation frequency and the cutting load. With the increase of the excitation frequency, the cutting load decreases first and then increases. The cutting load reaches the minimum when the excitation frequency is 30 Hz. The experimental results verify the feasibility of the theoretical analysis and are beneficial to improve the existing cutting rock breaking theory.

In the process of intelligent coal mine construction in our country produces massive data, including the data produced by ventilation, gas and other kinds of monitoring and monitoring system are dynamic real-time data, data scale is huge, and directly reflect the safety of coal mine production, for this part of monitoring and monitoring data, if analyzed and applied well, can greatly improve the level of safety production of intelligent coal mine. Therefore, it is an important task for the high-quality development and digital transformation of the coal industry to explore the path to improve the ability of coal mine monitoring data governance. Based on the characteristics of data elements and application paradigm of coal mine monitoring and control, this paper analyzes the role and position of data governance in intelligent coal mine enterprises, defines the concept and connotation of intelligent coal mine monitoring and control data governance, and puts forward the research paradigm and overall framework of data governance in the whole process from basic data collection, data development and management to data value formation. Following the concept of data-driven decision-making, the quantitative relationship and logical relationship implicit in intelligent coal mine monitoring data are identified, and multiple comprehensive research methods and deduction methods such as big data tools and management decision-making methods are adopted to mine laws, rules, patterns and mechanisms, so as to guide data application practice with theories. A data value realization path of "information mining- theory inference-scene application" is formed, and a structural equation theoretical model of monitoring and monitoring data governance ability improvement path is constructed, and the demand-oriented, transfer and influence relationship between learning elements and learning modes of monitoring and monitoring data governance ability improvement under the background of intelligent coal mine construction is systematically analyzed. This paper explores the key path to improve the monitoring data governance ability of coal enterprises.

Boundary detection places an important role in underground coal mine autonomous driving technologies. Accurate boundary information is beneficial to object detection and subsequent decision and control of autonomous trackless rubber-tyred vehicles. To meet the urgent demands in underground boundary detection, a method for underground boundary detection and tracking is proposed. The proposed method consists of four parts: real-time point cloud correction, point cloud gridding, boundary fitting and boundary tracking. Based on the characteristics of irregular boundaries and frequently changing slopes in underground mines, a real-time point cloud correction method is designed, which consists of pre-correction and dynamic correction to achieve parallelism between the road point cloud and the LiDAR coordinate system. To avoid the influence of uneven road surfaces on boundary extraction, the corrected point cloud is projected into a two-dimensional gridding map. To address the problem of blind areas caused by turnings and chambers, the Kalman Filter is utilized to track the missing point cloud. The performance of the proposed was evaluated on the data collected in real-world operation scenarios. The experimental results demonstrate that the proposed method can detect and track underground boundaries with the precision of 91.2%, as well as meet the real-time requirements in autonomous driving.

In order to effectively evaluate the health status of shearer, a shearer health status evaluation model based on PCA and cloud model is proposed in this paper. Taking the shearer in a mine as the research background, 10 influencing factors from four aspects of cutting department, traction department, frequency conversion department and height and pressure regulation are selected as the evaluation indexes to establish the health status evaluation system of shearer; In order to avoid the subjective influence of decision-makers, this paper evaluates the shearer health state from a quantitative point of view, uses PCA to reduce the dimension of the data and calculate the weight of each index, constructs a shearer health state cloud model based on cloud theory, and determines the shearer health state level according to the characteristic parameters of the cloud model. The results show that the cloud model evaluation method of shearer health state based on PCA can accurately judge the current shearer health state, and provide a certain reference for coal mining enterprises to arrange maintenance plans.

The vibrating screen is an important mechanical equipment in coal preparation process and its fault signal shows nonlinearity and non-stationarity characteristics with the influence of uncertain factors such as external noise. However, most of the existing fault diagnosis methods are difficult to achieve effective extraction and accurate diagnosis of uncertain fault features. Therefore, a fault diagnosis method for vibrating screen in coal preparation plant based on feature fusion is proposed in this paper. The cloud model and principal component analysis are used to extract the dynamic-static feature information. Based on the stochastic configuration network algorithm, a diagnosis learning network is established in an autonomous way to ensure the fast convergence performance of the model. Finally, the superiority of the diagnosis method is verified by the data of the vibrating screen in the coal preparation plant.

The deep screening of wet fine coal can be effectively solved by the flip-flow screen, and the motion of screen panel has important effects on the depolymerization of wet fine coal mass. In order to study the depolymerization mechanism of wet fine coal mass in the process of large deflection elastic collision. In this paper, a kinematic simulation model of large deflection elastic screen panel is established based on Bonding Particle Model in discrete element method. Through the use of contact models after redevelopment, the large particle coal is replaced by the agglomerated equal diameter fine particle coal. The elastic collision between wet fine coal mass and large deflection screen panel is simulated and analyzed, and the influence of screen surface amplitude, frequency and collision velocity between fine coal mass and elastic screen surface on the depolymerization of fine coal mass was studied. Results show that the depolymerization degree of fine coal mass increases with the increase of the amplitude and frequency of the screen panel, and increases firstly and then decreases with the increase of the collision velocity between the coal mass and the screen panel, and the number of collisions increases with the increase of the frequency. This research is beneficial for the application of the discrete element method in the process of elastic screening with large deflection.

Hydroxypropyl starch copolymer (HPS-AM) was prepared by using ceric ammonium nitrate as initiator, hydroxypropyl starch (HPS) and acrylamide (AM) as raw materials through aqueous solution polymerization. The structure and morphology of synthetic HPS was characterized by infrared spectrum, scanning electron microscope and thermogravimetric analysis. The effects of flocculant dosage, stirring strength and pH value on the flocculation effect of coal slime water were investigated, and the comparative experiments of HPS-AM with PAM (500), PAM (1200) and polyaluminium (PAC) were carried out, the results show that the settlement effect is the best when the dosage of HPS-AM is 4 mL, the stirring intensity is 20 r.min-1 and the pH value is 8. After flocculation and sedimentation of coal slime water, the turbidity of supernatant is 24.69NTU and the floc compression rate is 99.90%; And the turbidity of supernatant is 83.81%, 77.25% and 80.07% lower than that of PAM (1200), PAM (500) and PAC respectively, and the floc compression rate is 0.18% higher than that of PAM (1200), PAM (500) and PAC. It is proved that HPS-AM is an excellent new flocculant for coal slime water.

Active carbon raw coal produced in domestic traditional areas is nearly exhausted, and Xinjiang with good resource endowment is bound to become the undertaking base of activated carbon industry. The optimization research of the preparation process of producing typical coal species in Xinjiang can lay a good foundation for the development of activated carbon industry in Xinjiang. In this paper, Hami weakly caking coal and Zhundong non-caking coal are selected as raw materials, and the low-speed carbonization and physical activation process are used to prepare granular activated carbon and adjust the coal particle size and carbonization activation parameters. The iodine value, methylene value and hardness of activated carbon were tested, and the adsorption and desorption curve of activated carbon was measured with liquid nitrogen as the medium to obtain its surface area and pore structure. Hami weakly caking coal can produce briquetted activated carbon with iodine value of 1135mg/g and hardness of 92.9%. The fineness of coal powder has a great influence on the hardness of activated carbon. The final temperature of carbonization is 650°C, and 140min activation at 950°C is the ideal process condition. Zhundong coal cannot be prepared into briquetted activated carbon because of its lack of caking. Both weakly caking coal and non-caking coal can be prepared into granular activated carbon. The fineness of coal powder has little effect on the hardness of the granular activated carbon made, and coal tar is the key to the formation of extruded activated carbon hardness. Asphalt in coal tar is more likely to form a highly oriented and more regular structure during the carbonization process, which is not conducive to the subsequent activation of pore formation. Under the final temperature of 650℃, the ideal activation time of the activated carbon prepared by the weakly caking coal is 160min, and the non-caking coal needs to be extended to 180min. The iodine value of the produced activated carbon is 945mg/g and 912mg/g, respectively. Under the final temperature of carbonization of 650℃, the ideal activation time of activated carbon prepared by non-caking coal is 160min, and Zhundong coal needs to be extended to 180min. The iodine value of the produced activated carbon is 945mg/g and 912mg/g, respectively. The reactivity of the inertinite in the coal is weak, and the Zhundong coal with more abundant inertinite needs a long activation time to develop the pores.

Large diameter borehole is a commonly used technical method for local relief of rockburst in coal seam. By increasing the borehole diameter and expanding the pressure relief area in the coal seam, the purpose of improving the preventing rockburst effect is achieved. Therefore, a special drilling rig and auxiliary drilling tools are developed for drilling 300 mm borehole in coal seam. The drilling rig has the characteristics of remote control under the coal mine, automatic loading and unloading of drill pipes, and large adjustment range of output parameters, which improves the automation of the drilling rig, reduces the labor intensity of workers, and improves the drilling efficiency of large diameter borehole, The safety during the drilling the large diameter borehole and pressure relief effect of large diameter drilling are improved. The test proves that the parameters of the drilling rig have reached the design targets.

Abstract：The fault diagnosis technology of coal mine machinery is the core technology to ensure the safety of coal mine production, and an indispensable part of the intelligent development of coal mines. In this paper, the fault diagnosis technology of coal mine machinery is divided into model-based fault diagnosis technology and data-driven fault diagnosis technology from the perspective of fault diagnosis principle, and the related research status is elaborated. Then，the fault diagnosis technology of coal mine machinery is classified from the perspective of signal types used in fault diagnosis, and the advantages and disadvantages of various types are analyzed.On this basis, the current difficulties in fault diagnosis of coal mine machinery and equipment are pointed out and corresponding countermeasures are proposed. The research in this paper can provide guidance for promoting the engineering application of coal mine machinery fault diagnosis technology.