In order to realize the safe and high efficient mining of 1000m deep mine under complex conditions, based on the analysis of mine resource conditions, combined with the ground layout and production experience in mining area, the reasonable development and mining system and mining technology of Xinhu mine are determined from the aspects of development mode, wellhead location selection, shaft number, roadway layout and mining technology of the first mining area. The test run of mine shows that the expected design goal of 1000 people per well has been achieved, which provides a reference for similar mine construction.

In order to study the selection of reasonable roadway cross section shape under the condition of upward mining in Yangchangwan Coal Mine, through theoretical calculation of the "two zones" height after the second coal mining and field measurement of the failure range of overburden rock in goaf, the advantages and disadvantages of different roadway cross section shapes and their application range are summarized. FLAC3D numerical simulation software was used to simulate and study the stress and deformation failure characteristics of the surrounding rock under the condition of upward mining, and the field verification was carried out. The research shows that after the second coal mining, the height of the fracture zone is about 38.75-49.95m, the integrity of surrounding rock is low, and the upward mining roadway is located in the fracture zone. The simulation results show that the stability of the surrounding rock is the best in the straight wall semi-circular arch section, followed by the micro-arch section and the worst in the rectangle section. Combined with numerical simulation analysis and field verification, the micro-arch section is the most suitable one.

Aiming at the present situation of roadway protection effect of wide coal pillar, large deformation of coal wall wall and surrounding rock, and serious waste of coal resources when driving along goaf in fully mechanized caving of extra-thick coal seam, etc. Taking 2302 working face track passage of Panjin Coal Mine in Yili as engineering background, a mechanical model of narrow coal pillar was established based on limit equilibrium theory, and the influence laws of lateral pressure coefficient, mining height, buried depth and support resistance of coal pillar on the width of narrow coal pillar were investigated. The results show that the width of coal pillar increases with the increase of the first three pillars, and vice versa. The difference between the upper limit and lower limit of the reasonable width range of coal pillar also increases, while the latter hardly changes. In addition, combined with the geological conditions, the width of the narrow coal pillar is determined to be 6m, and its rationality is verified by numerical calculation, and the industrial test is carried out on the track passage of 2302 working face. The field practice results show that during the period of 6m narrow coal pillar excavation along the goaf, the roadway section development contour has no obvious deformation, and the surrounding rock control effect is remarkable.

To solve the problems of large water inflow, high proportion of sewage and low utilization rate of resource in the bordering area of Inner Mongolia and Shanxi, the idea of construction of groundwater regulation and storage system to stabilize the water inflow, purify sewage, reduce water treatment pressure and improve water utilization rate of mine is put forward. According to the conditions of coal seam burial and mining, the feasibility study on underground storage, purification and storage of mine water is carried out from construction conditions and location principles of the storage system, water capacity calculation, water quality guarantee, isolation engineering construction conditions, strong mine pressure impact analysis, safety guarantee, economic and environmental benefits. Based on the feasibility study, the demonstration project of mine water regulation and storage system is formed by using the construction of goaf in a coal mine in hugilt mining area, and good economic and environmental benefits have been obtained.

The low temperature waste heat utilization project of Zhao Gu Coal Mine was tested in this paper and found that the system runs stably. However, the utilization rate of parallel heat of multiple low temperature heat sources is low, the model of the system was established by TRNSYS software and the correctness of the model is verified by the existing system, the model is used to analyze the heat utilization rate of multiple low temperature heat sources in series, the results show that Multiple low temperature heat sources in series are more efficient than in parallel, and it indicates the direction for the optimization of the system, provides a reference for the design of the same type project.

Aiming at the problem of surrounding rock control in deep soft rock roadway through thick coal seam cracked roof area, The characteristics of engineering failure are analyzed by field investigation,Combined with the analysis of borehole peep results,the reason for the deformation and instability of surrounding rock is concluded that the broken rock reduces the supporting performance of inner anchor net, fails to form a unified carrier with surrounding rock, the expansion of surrounding rock loose circle and uneven deformation lead to the decrease of supporting performance of U-shaped shed, Further lead to insufficient support resistance and the surrounding rock expands, until the destruction.In order to realize the secondary bearing capacity of the broken rock mass,A stable bearing structure is formed by modifying the broken surrounding rock and optimizing the stress of surrounding rock through pre-grouting and combination of metal framework,The supporting effect of inner anchor net is strengthened and the inner anchor is effective and the outer frame is reliable. Based on this, the combined control technology of "advance support + internal anchor and external frame combined control of roof +locking leg control of side wall + guniting and Grouting reinforcement+ Bottom plate water control and pressure relief groove relief " was proposed,The combined support system is formed, Including anchor solid and grouting rock mutually reinforcing, strong control of the roof, supplemented by control of the bottom; Through preliminary field engineering practice,good supporting effect has been achieved．

Aiming at the problem of large deformation and serious collapse of the surrounding rock of the roadway under the traditional support scheme of thick-top coal and gangue roof, taking the 818 machine roadway in the 81 mining area of Xinhu Coal Mine as the research object, theoretical analysis and FLAC3D numerical simulation method are used to compare 818 The optimization of the original support parameters of the machine tunnel was carried out, and the composite support technology of "three-center arch U-shaped steel shed + anchor cable beam + lock leg beam" under the thick-top coal gangue roof was proposed, which solved the problem of the thick-top coal gangue in Xinhu Coal Mine. The problem of roadway support under the roof. The results of underground tests and field measurements show that after composite support, the stress state of the surrounding rock of the roadway is significantly improved, and the roof subsidence is controlled near 50mm, which plays a good role in supporting the roadway and can meet the needs of safe and efficient production in the mine.

In order to solve the problems of large deformation and difficult support of surrounding rock of roadway in three soft coal seams and waste of resources of retaining large coal pillars between sections, the roadway layout and support mode are optimized. The method of combined support of adjacent roadway of roadway excavation along goaf in staggered position and staggered outside of thick coal seam is adopted. Firstly, the coal pillar of roadway along goaf is determined to be 5 m by limit equilibrium zone method, and the mechanical model of key block B is established, It is calculated and analyzed that the key block B will not have sliding instability and rotary instability. Secondly, the combined support technology of adjacent roadways is introduced. Finally, FLAC3D numerical simulation software is used to simulate and compare the surrounding rock support effect during roadway recovery after the original support scheme of roadway excavation along the goaf with staggered layer is optimized and the roadway support scheme is optimized, The results show that the optimized support scheme can stably suspend the shallow surrounding rock of the roof in the deep stable rock stratum and control the deformation of the shallow surrounding rock of the roadway; The side wall anchor cable and the roadway top anchor cable form a joint anchor zone, which enhances the anti separation ability of the roof, strengthens the control ability of joint fissures in different directions of the roof surrounding rock, and can effectively ensure that the roadway surrounding rock is in a stable state.

In order to improve the prevention and control effect of rockburst dynamic disasters in deep shaft coal roadways, based on the occurrence characteristics of rockburst disasters and engineering geological conditions in Gaojiabao Coal Mine of Zhengtong Coal Industry in Shaanxi, the universal theory of dynamic and static coal damage control through the combination of dynamic and static loads The method of exploration reveals the disaster mechanism of coal roadway pressure burst in Gaojiabao coal mine, and clarifies the prevention and control method of dynamic disaster caused by combined dynamic and static load stress field. On this basis, considering the characteristics of long service life of coal seam roadways and high degree of stress concentration in surrounding rocks, combined with the impact failure mechanism of the roadway induced by dynamic disturbance, a targeted combination of "blasting loosening + surrounding rock grouting" is proposed to control surrounding rock disasters. , And verified through the comprehensive research method of numerical simulation and field test. The research results show that the scientific prevention and control of rock burst dynamic disasters in deep shaft coal seam roadways aims to increase the attenuation of dynamic stress waves and reduce the stress concentration of surrounding rocks; and the realization of "blasting-grouting" joint control technology has both the above effects , In the field engineering practice, the prevention and control effect is good, and it can be used as one of the effective ways to prevent and control the rock burst disaster in the deep shaft coal seam roadway.

Aiming at the problems of high gangue content and low recovery rate of the whole fully mechanized caving mining in soft surrounding rock and extra-thick coal seam, the paper put forward the "top layer and large mining height fully mechanized mining frame after high-efficiency netting + lower slicing whole layer fully mechanized caving" mining Method,determined the netting, hanging, spreading, and networking processes for efficient netting after the top-slice large-cutting height fully-mechanized mining frame,developed an efficient net-laying material transportation system and an automatic net-spreading system after the working face frame, and determined the efficient netting method after the rack.The ground test of the efficient netting system was carried out to test the compression effect of the flexible net, the efficiency of the netting transportation system, the effectiveness of the netting process and the speed of networking.The test results show that the pulling speed of the high-efficiency netting and transportation system behind the large mining height fully-mechanized mining frame is 43.1m/min~49.1m/min, and the networking speed is 1.33m/min.The flexible net roll at the rear of the support can be spread smoothly without any distortion or shrinkage of the net roll. The net roll is effective and feasible; The overall process operation time of the net laying is 87.5 minutes, and the annual production capacity of the working face can reach more than 6 million tons.It can realize the high productivity and efficiency of the working face.The test results have important reference significance for the high-efficiency and high-recovery mining of soft surrounding rock and extra-thick coal seams.

In order to analyze the diffusion and migration law of transfer and crushing dust in fully mechanized coal caving face, the model was built according to the actual situation of the intake airflow roadway and the numerical simula-tion was carried out by FLUENT software. The results show that the main dust producing points in the intake air-flow roadway of the fully mechanized coal caving face are located at 1m of the reversed loader head and around the protective cover of the crusher, and the high concentration of dust is mainly concentrated at about 1m above the ground. The dust concentration in the dust center at the transfer point is high, and the dust rising height is about 0.5m. Therefore, the mist drops must be targeted when spraying for dust removal. The dust around the crusher protective cover is distributed in layers, and the dust concentration gradually decreases from the ground up. The dust escaping from the gap is far less than the dust generated at the transfer point. Overall, the dust starts up at 1m of the reversed loader head in the intake airflow roadway, and a high concentration of dust is formed at the bottom of the protective cover at central of the crusher and the reversed loader head. The dust concentration reaches the maximum at crusher, and the dust diffusion tends to be basically stable at the tail of the reversed loader finally. Therefore, the spray parameters of the spray system can be adjusted according to different positions during dust control.

Aiming at the problems in the application of this technology in the cross-measure borehole, such as poor reliability of fixaton, high cost of full-hole screen pipe,the optimal jaw length of the suspension device was studied and the drill bit was optimized.The application results show that the jaw length is 95mm, which is reliable in the commonly used 103mm high inclination hole, the drill bit has high drilling efficiency and the bit opening is reliable.Under the same drainage conditions, compared with the same number of open holes, the gas drainage concentration and drainage flow rate increased by 26% and 78% respectively. In the late period of the nine-month drainage period, the average increase of drainage flow rate increased by 20%. The method of screen pipe running in the coal hole section was also proposed, the detachable positioning device was designed, and the technology of screen pipe compeletion in cross-measure borehole was improved, which provided a technical idea for the completion of positioning screen pipe of the coal hole section in cross-measure borehole.

With the increase of mining depth in Chensilou Coal Mine, the limestone water pressure and the probability of water inrush increase. After water inrush, the cost of drainage increases with the increase of mining depth. Water inrush from floor not only threatens mine safety, but also greatly reduces mine economic benefits. In particular, the limestone karst fissures in the upper section of Taiyuan Formation in the mining area of the south wing of the mine are developed, which have the characteristics of high water pressure, strong water yield and rich water supply, which pose a serious threat to the safety production of the mining face. In order to solve the problem of limestone water disaster prevention and control during the mining of coal seam in the deep mining area of the south wing of Chensilou Coal Mine, the 2506 working face (inner section) of the south wing of the mine took the lead in implementing the ground area treatment project of floor water disaster. Through the construction of ground boreholes, regional advance bedding exploration of limestone karst fissures, water diversion channels and water storage spaces, and high-pressure grouting plugging, The transformation of the aquifer into an equivalent aquifer has liberated the coal resources threatened by the high-pressure and strong aquifer. At present, the working face has been safely mined. The research results provide a reference example for Yongxia mining area and similar mines harmed by high confined water in the floor in China.

Abstract: Shaanxi Yanchang Petroleum Yulin Kaiyue Coal Chemical Co., Ltd. Coal slurry preparation system of the three rod mills have been in a fully open state, no standby machine, when the rod mill failure shutdown, the subsequent gasification and synthesis must reduce the load, thus affecting the output of methanol.In order to reduce costs and increase efficiency and expand production capacity, Yulin Kaiyue decided to adopt the three-generation discontinuous gradation CWS preparation technology developed by the General Institute of Coal Science and Technology to transform the original pulping system.Standby a coarse powder production line, when a rod mill maintenance or failure to start, in order to fundamentally solve the bar mill unprepared machine caused by the production load fluctuation problem.The complete set of technology of discontinuous gradation of high concentration pulping organically combines selective grinding machine and fine grinding machine, which greatly improves the comprehensive grinding efficiency, and the coal slurry concentration can be increased by more than 4 percentage points.

In recent years, destructive rockburst accidents have occurred in multiple working faces in the deep mining area of the Ordos Coal Base, which has been listed as the main disaster for coal mining in the region, affecting coal output accounting for nearly 1/3 of the total area. Using comprehensive methods such as theory, experiment and actual measurement, the types and mechanism of rockburst are systematically studied, and key countermeasures against erosion are proposed. The results show that: (1) The deep mining area of Ordos has typical conditions such as a large depth, a thick base strata structure composed of multiple sets of hard and thick stratum, a complex coal structure, high-strength mining, and the surface subsidence value is very small. The types of rockburst could be divided into 4 types: geological master control type, engineering master control type, compound master control type, secondary disaster type. (2) Consider the influence of aquifers water drainage in overlying strata, a theoretical model of movement subsidence and separation movement of mining strata was established, on the basis of similar tests and on-site monitoring, and the rockburst failure mechanism of small structure of surrounding rock structure under the influence of large-scale strata structure subsidence and separation movement. (3) Aiming at the typical mining conditions in the deep mining area, the scientific design of rockburst prevention and control and key technical countermeasures throughout the whole process of "before mining, during mining and after mining" was put forward, based on the analysis of the technical principle of reducing the impact of rockburst based on pressure optimization and strain control. Shirawusu Mine and Yingpanhao Mine were successfully applied. Practice shows that the countermeasures taken not only improve the resource recovery rate, straighten out the relationship between mining and continuation, but also achieve the purpose of effective prevention of rockburst, which can provide a reference for the prevention of mine rockburst under similar conditions.

In order to improve the pertinence of the implementation of on-site prevention and control measures in rock burst mines, taking I010203 working face of B2 coal seam in a shallow buried hard roof coal mine as the engineering background, the temporal and spatial evolution law of microseismic monitoring information before and after the occurrence of previous large energy tremors was studied. The results show that: the focal position of large energy tremors in I010203 working face are affected by the upper "knife handle" goaf boundary, which have stage characteristics, and mainly concentrated in the middle and lower part of the working face, section coal pillar and surrounding rock of lateral goaf. Vertically, it is mostly located in coal and roof rock, and the fracture of hard roof is the main inducing factor of rock burst; within 7 days before the occurrence of the large energy tremor, the b value of the microseismic precursor warning factor, the A(t) value of the total fault area and the S value of the microseismic activity suddenly decrease or increase, respectively, and keep the low value or high value anomaly, indicating that the elastic energy accumulation and fracture degree increase in the coal and rock mass, and the rockburst risk increases; the microseismic factor contour drawn with spatially smoothed seismicity method presents certain regularity before the occurrence of large energy tremors, which can further quantify the local rockburst risk area. The research results reveal the spatio-temporal precursory information characteristics of rock burst under hard roof conditions, which can guide the field personnel to take targeted measures for rockburst risk, and contribute to the accurate prevention and control of rock burst in coal mine.

Aiming at the problems that the bolt can not be repeatedly pre tightened and the strength of the bolt is weakened after the wall expansion of Ji 15-23090 machine roadway in Pingdingshan No.4 coal mine, this paper puts forward a new type of pre tensioned bolt supporting equipment, and studies the influence of the pre tensioned force on the bolt anchoring performance. Through numerical simulation and uniaxial compression test, the characteristics of rock mass strength and internal fracture development under different pretensions are analyzed. The results show that: (1) the peak strength and residual strength of rock mass can be effectively improved and its ultimate bearing capacity can be enhanced by tensioning high pretension anchor（ 2) High preload can restrict the development of internal tension and shear fractures, and improve the integrity of rock mass. After the tunnel test, the bolt pretension is generally more than 60kn by tensioning the lock. After using the lock to fasten the bolt, the displacement of the roadway side is reduced by 44.3% compared with the original support method, which solves the problem that the bolt can not be repeatedly preloaded due to the insufficient length of the tail thread, and reduces the construction strength and support cost.

Abstract：In order to study the state of coal pillars left over from the upper protection layer mining in deep wells when the lower protection layer is mined, the coal pillar’s ultimate strength calculation, numerical simulation and on-site detection are used to conduct simultaneous research plans to communicate with Pingdingshan No. 4 Mine 15-23160 The section coal pillars with a width of 4 m on both sides of the roadway have been studied, and the conclusions are as follows: 1) The theoretically calculated ultimate strength of the section coal pillar is 26.0 MPa; 2) Coal pillar 1 and coal pillar 2 are in the Ji 15 coal seam and 16.17 The maximum vertical stress that the coal seam withstands during mining is 131.1 MPa and 85.1MPa, which far exceeds the ultimate strength of the coal pillar; 3) The maximum residual height of the remaining coal pillars detected by the two detection groups on site are both 0.64 m, and the height loss reaches the original coal 60% of the height of the pillar, the collapsed coal body rushes to the goaf on both sides of the coal pillar and the 15-23160 connecting road; 4) The residual coal pillar will not form an obvious stress concentration area on the protected layer in the lower part, and the protection effect is in there is continuity in the tendency.

In order to explore the development rule of water-conducting fracture zone in fully-mechanized coal face and provide important reference for the prevention and control of coal mine roof water damage, the development height of water-conducting fracture zone in 9105 fully-mechanized coal face of Gaizhou coal Mine was studied by traditional empirical formula calculation, software numerical simulation and borehole peeping technology, and mutual verification was conducted. The results show that the development height of the water-conducting fracture zone determined by borehole peeping technique is more accurate, but it is greatly affected by the highest saddle-shaped position and observation time of the overburden after mining. Height correction using borehole trajectory analysis is the key to improve borehole peeping technique to determine the height of water-conducting fracture zone. The closer the dip Angle and bearing of borehole are to the design parameters, the more accurate the prediction of the development height of water-conducting fracture zone will be. It can be seen that the combination of borehole peeping technology with traditional empirical formula and numerical simulation technology to determine the development height of water-conducting fracture zone is an effective means to improve the quantitative evaluation of the development height of water-conducting fracture zone.

Aiming at the problem of fast excavation and slow support in coal mine roadways in complex geological conditions, a multi-track drilling and anchoring robot group integrating drilling, protection and anchoring is proposed. According to the needs of roadway support, design the body structure, drilling rig layout and support technology of the anchor drilling robot, complete the three-dimensional modeling of the anchor drilling robot; establish the kinematics model of the anchor drilling robot rig based on the DH method, analyze and solve the roof drilling rig and side drilling rig Kinematics solution and inverse kinematics solution, simulation to obtain the point cloud picture of the supportable area of the rig, the end motion trajectory, etc. The results show that during the supporting operation of the top and side rigs, the interference between the rig and the robot body can be avoided, and the movement to the position to be supported can be achieved accurately and smoothly, with strong stability and reliability.

In this paper, didodecyldimethylammonium bromide (DDAB) was selected as Gemini surfactant, kerosene (C12) and methyl oleate (MO) were used as collectors to investigate the promotion mechanism of DDAB on low rank coal flotation. Through the slime flotation unit test, the optimal dosage of DDAB was determined as 0.5 mM. At this time, the clean coal yield of DDAB/C12 synergistic action was 76.91%, and the clean coal yield of DDAB/MO synergistic action was 75.86%. The infrared spectra of low rank coal before and after the reagent action were measured. The results showed that DDAB masked the-OH and-C=O groups on the surface of low rank coal. Through simulation analysis, DDAB has the highest molecular activity and is more easily adsorbed on the surface of low rank coal. The adsorption form of mixed reagent on the surface of low rank coal is laminated co-adsorption, DDAB preferentially adsorbed on the surface of low rank coal, followed by C12 and MO.

Abstract: Aiming at the demand for intelligent development of dense medium separation, according to the noise characteristics of dense medium clean coal ash content and the requirements of ash content process control for ash prediction accuracy and prediction time, a time series prediction method of dense medium clean coal ash based on EMD-LSTM is proposed.First, the empirical mode decomposition (EMD) algorithm is used to decompose the different scale components in the clean coal ash time series data step by step to generate a series of eigenmode functions with the same feature scale to remove certain noise effects; secondly, further use Long and short-term memory (LSTM) neural networks can solve the problem of long-term dependence on data, which makes it more prominent in long-term visual field prediction. This method is applied to the short-term prediction of actual data sets. The experimental results show that after optimizing the parameters of the LSTM neural network, the EMD-LSTM-based heavy-medium separation clean coal ash index time series prediction method is obtained by removing the IMF1 component of the model The prediction result has the smallest standard deviation σ (0.1481) and the average absolute error λ (0.1184). The EMD-LSTM model after removing the noise can significantly improve the prediction accuracy and effectively solve the problem of ash prediction of clean coal.

In order to identify the water source of mine water inrush quickly and accurately, and reduce the harm caused by mine water inrush, Baode mine was taked as an example, Ca2+、Mg2+、Na++K+、SO42－、Cl-、HCO3- were selected as the discrimination indexes. Through The representative water samples of each aquifer Were determined by analyzed the chemical characteristics of water samples. And then, the coupled Principal Component Analysis (PCA) - Outlier Tests (OT) - Regression - Bayes model were used to identify the water source of Baode mine. The results show that: the water quality types of the Goaf, Permian sandstone aquifer, Carboniferous sandstone aquifer and Ordovician limestone aquifer in Baode mine were HCO3-Ca.Na.Mg, HCO3-Na, HCO3-Na, HCO3-Ca. The main components of Baode mine water samples are Ca2+、Mg2+、Na++K+、SO42－, which can be used as comprehensive indicators to reflect the original water sample data information of Baode mine. The outliers in the tested water samples were determined and corrected by Outliers Test and Regression model. Compared the results of before and after data correction, the accuracy after correction was 95%, and the accuracy was significantly improved, which can accurately and efficiently identify water inrush source.

In order to explore the mechanical properties and failure mechanism of fractured rock mass in cold region, conventional triaxial compression tests were carried out on saturated sandstone with different fracture dip angles under -10℃ freezing environment. The results show that the geometric characteristics of fractures have a great influence on the development of stress-strain curves of sandstone during loading. The initial section of the stress-strain curve is "convex", which is due to the fact that the load is mainly borne by the ice body in the pores and fissures of the rock mass. The peak strength, elastic modulus and shear strength parameters of sandstone are linearly positively correlated with fracture dip angle, while Poisson's ratio and volume strain are negatively correlated with fracture dip angle, but the variation range is not obvious. The low temperature freezing environment enhances the degree of cementation and friction between sandstone particles to a certain extent, so that different fractured sandstones show the characteristics of monooblique shear failure, and there are no obvious wing cracks and secondary cracks except the oblique cracks in the main shear plane. By establishing the damage evolution equation considering the strength and deformation of fractured sandstone, it is found that with the increase of fracture dip angle, The stress levels of initiation and dilatancy of sandstone increase gradually, and the drop state of post-peak stress-strain curve is more obvious. it shows that the elastic stage of the stress-strain curve becomes longer, the plastic stage becomes shorter, the brittleness of sandstone increases and the ability to resist plastic deformation decreases

The coal content in gangue is one of the key indicators of coal preparation production, which cannot be detected online at present. A new method based on machine vision and particle swarm optimization-support vector machine (PSO-SVM) was proposed to detect the coal content in gangue. First, the sample pictures on the gangue belt are segmented to identify the areas belonging to the category of coal and gangue. The size feature and density feature are extracted from each region. The characteristic parameters of coal and gangue are obtained respectively, and then the feature of the gangue are divided by that of coal to obtain the two-dimensional feature of the sample picture. At the same time, the binocular images are collected on the belt, the height information of the image is obtained, the height ratio 3D image characteristics are calculated. The eight optimal features are screened by calculating the Pearson correlation coefficient, and finally the support vector machine is used to predict the coal content in gangue and optimize it through particle swarm optimization. Establish a plane feature model and a 3D feature model, and compare and analyze the prediction results of the two models. The performance of the 3D feature model is significantly better than that of the plane feature model. The average relative error is 7.57%, which was satisfactory.

At present, the unsafe behavior of underground workers such as omission of inspection is one of the factors that affect the safety of coal mine enterprises. Aiming at the video data features of complex underground environment, single background and not obvious reference, it is difficult to measure the velocity of moving target directly by visual calculation. In order to solve the above problems, a speed detection method that does not rely on scene calibration is proposed, and the operation specifications of underground workers can be intelligently monitored through independent learning. The method is based on YOLOv3 to continuously detect and track the inspectors. In this process, the design uses the target boundary box feature points in the adjacent frames of the video to determine the image vanishing point; secondly, it uses the image vanishing point measurement real-time speed; finally, use the measured speed trend to intelligently judge whether underground workers have unsafe operation behaviors. The experimental results on coal mine data sets show that the proposed method can effectively measure the velocity of moving targets in the mine, and is used to judge whether there is missing detection behavior when underground workers patrol, which is more suitable for application in the underground scene than the calibration method.

China's coal industry is in the primary stage of intelligent mining and due to the limitations of complex and diverse mining geological environment and intelligent equipment manufacturing technology. Reliability of intelligent fully mechanized mining equipment system cannot support the demand for adaptive mining. In order to clarify the controlled factors of the reliability of intelligent fully mechanized mining equipment system, the influencing factors of the reliability of intelligent fully mechanized mining equipment system were analyzed from the perspectives of system, equipment, technology and environment based on its connotation and characteristics. Firstly, the concept of intelligent system of fully mechanized equipment is expounded clearly, namely intelligent fully mechanized coal mining equipment system based on intelligent fully mechanized fully mechanized equipment as the core, fusing the cognitive system, communication network, control system and other kinds of component unit organically in together, and the collection, analysis and decision-making of big data of coal mine production are integrated with information as the dominant role, and then form an accurate cooperative operation system from equipment, communication, perception, control to decision management level. It is pointed out that its main features are based on intelligent single-machine fully mechanized mining equipment, centered on big data production, interconnected intelligent fully mechanized mining equipment, and targeted at precisely cooperative control of intelligent fully mechanized mining equipment. According to the connotation and characteristics of the intelligent of fully mechanized mining equipment system, a reliability index system of intelligent fully mechanized mining equipment system is established, which includes six aspects: reliability of fully mechanized mining equipment, reliability of sensor system, reliability of control system, reliability of communication system, fusion degree of production data, fusion degree of equipment and environment, and some research directions are proposed by the characteristics of different sub factors.

This paper proposes a fuzzy mathematical method for predicting the speed of the cutting head of a cantilever roadheader based on fuzzy mathematics, in view of the difficulty of identifying the cutting load in the process of underground roadheading. By analysing the working process of the cutting head of the roadheader and fusing the information from multiple sensors measured underground, the predicted output of the cutting head load is obtained and the cutting head speed is divided into four gears, which provides a basis for in-depth research on the adaptive control of the cutting head speed under different working conditions.

Research on advanced driving methods of articulated vehicles for explosion-proof lead-acid batteries in underground coal mines, including single-motor centralized driving system, dual-motor double-axle driving system and distributed driving technology. The characteristics of each driving system are analyzed separately, and representative vehicles are introduced for different driving systems, and the advantages and disadvantages of the three driving systems are described separately. Comprehensive comparison, using distributed driving system makes the articulated electric vehicle more flexible for the overall arrangement, the higher transmission efficiency, and the wider application field.Therefore distributed driving technology is a leading on the drive control system of coal mining electric articulated vehicles in the future

In order to identify the key factors to improve the miners'safety communication satisfaction, the improvement strategy of miners'safety communication satisfaction is put forward to reduce the unsafe behavior and human accidents.Based on the questionnaire survey of 21 index factors of safety communication satisfaction, this paper makes a statistical analysis of the survey results to determine the hierarchy classification and priority of improvement of miners'safety communication satisfaction.The results showed that 21 index factors were divided into 2 essential factors, 2 charm factors and 17 one-dimensional factors, which were combined with KANO-IPA Matrix analysis, to determine the key factors affecting the miners'safety communication satisfaction and the priority of improving the factors, and put forward the strategies to improve the quality of miners'safety communication.

In order to systematically analyze the accidents of coal mine hoisting and transportation system, a risk analysis method based on Bayesian network and pre-hazard analysis (BN-PHA) is proposed. Firstly, Using GeNle software, the risk Bayesian network structure of the transportation system is constructed, and its two-way reasoning ability is used to identify the Bayesian risk nodes that are most likely to cause transportation accidents. Then, the risk of the accident nodes is analyzed in advance, the causes and possible results of the accident are analyzed, and the corresponding rectification measures are put forward. The results show that: illegal traffic, signal device failure, illegal driving, overweight and overspeed and connector failure are the most likely risk factors causing coal mine lifting transportation accidents, and the countermeasures to prevent these risks are put forward to provide reference for the safe and effective operation of coal mine transportation system.