Solid filling mining technology has achieved good application effects, such as rock stability control, ecological environment protection, reducing safety risks. The combination of goaf retaining technology and filling mining technology can realize maximum recovery of mining resources without coal pillar and control of uniform surface movement and deformation. In order to improve the working efficiency and reduce the working intensity of solid filling mining face, a mechanized method of retaining roadway along the backfill body edge of solid filling working face is proposed. This paper studied the process method of mechanical gangue retaining rack mold and modular circulating forward moving, and developed mechanized road-filling and retaining equipment, including high and low adjustable gangue retaining hydraulic template, rail type moving forward platform and joint type hydraulic manipulator. ADAMS is used to simulate the motion of the manipulator, and the displacement and velocity curves of the end point of the manipulator are obtained, which proves the rationality of the structure parameter design. ANSYS was used to analyze the compressive capacity of the gangue template structure. The results show that the overall structure has a small deformation and a certain compressive capacity under the load of 1Mpa. The simulation results provide reference for the follow-up research.

With the gradual increase of coal mining depth, more and more coal mines adopt vertical shaft development mode. The phenomenon of shaft wall destruction occurs from time to time due to a variety of reasons. In this paper, the pulverized and broken condition of main shaft wall in Liuyuanzi Coal Mine in Gansu Province is taken as the engineering background, and the reasons of shaft wall destruction are deeply analyzed by using wall peeping technology, measuring the strength of shaft wall samples and analyzing the water quality behind the shaft wall. In view of the failure characteristics, the comprehensive repair and treatment scheme of " strengthening, inject and release" was put forward. Through on-site verification and later monitoring, the operation of the repaired shaft was in good condition, and no shaft wall damage occurred, which provided a strong guarantee for the normal and safe production of the mine.

At present, the coal transportation (main transportation) in underground laneways of coal mines in our country mostly adopts the transportation mode of belt conveyor, personnel, equipment, materials, gangue and other auxiliary transport using trackless rubber-tyred vehicles, traditional rail plus aerial vehicle, monorail crane, rail truck and other ways. The main and auxiliary transportation systems inevitably need to cross over, and the general treatment plan is to raise the main transportation roadway (belt roadway) as a whole to achieve a certain height of roadway cross-layout, but in the course of the connection of Kuanggou Coal Mining area, in the past, the construction of main and auxiliary haulage roadways in the first mining area has been completed at the same elevation without crossing, so it is very difficult to arrange the roadways crossing. When the author demonstrates the continuous mining area of Kuangou Coal Mine, the position of the track system in the underground car park needs to be extended from one side of the stone gate to the other side, two schemes are put forward, one is the track roadway around, the other is the belt roadway with local roof-lifting. In view of the proposed interchange scheme, firstly, the possibility of equipment transformation is calculated and analyzed, and it is determined that the belt conveyor can meet the transportation demand of roadway curve section after technical transformation Then, the support form and parameter optimization scheme of the cross-point roadway is put forward by using FLAC software, which ensures the safety and stability of the roadway surrounding rock. Through the detailed comparison of the construction period, investment and operation cost of the two schemes of the track lane bypass and the belt lane local lifting the roof, etc. , the scheme of belt laneway overhead crossing is simpler than that of track laneway around, the construction period is shorter, the investment is less, and the operation cost is lower, good technical and economic benefits have been obtained. The case of the Roadway interchange can be used as a reference for technicians in the similar layout of the existing roadway system.

There is a huge amount of coal under buildings in China, and the current mining methods cannot safely and efficiently extract coal resources under buildings, making a large amount of coal resources unable to be effectively recovered. In order to liberate the coal resources under the building and extend the service life of the mine, based on the mining conditions of the Mahuangliang coal mine, a four-stage strip paste backfill mining technology under the building was proposed, and reasonable process parameters were determined. Taking the disposal of solid waste of coal gangue as the starting point, a gangue paste backfill material is prepared and its performance is analyzed. The four-stage paste backfill process is described, and the backfill strip plugging and high-efficiency roof connection process are designed. Combined with the field application, the effect and economic benefit of four-stage strip paste backfill mining are analyzed. The research and practice show that the flow and mechanical properties of gangue paste backfill material meet the backfill requirements of Mahuangliang coal mine. After mining with four-stage paste backfill mining technology, the roof connection rate of backfill body is more than 98%, and the maximum deformation value of surface building deformation and movement is within the fortification index, which realizes the successful practice of backfill coal mining under coal mine buildings. This mining method can liberate the coal resources under the building of about 10Mt in Mahuangliang Coal Mine, extend the service life of the mine, jointly dispose of coal gangue, and avoid the impact of gangue stacking on the ecological environment. It has good economic and social benefits. The research provides a useful reference for the "three under" mining of Yuyang District and surrounding mines.

Based on the structural characteristics, engineering geological conditions and foundation treatment of large diameter spherical coal storage bunker in shaanxi coal preparation plant, a set of safety monitoring system for spherical coal storage bunker was established. The sensors are designed and arranged from composite foundation, ring foundation and underground passageway. This monitoring system can reflect the load change trend of spherical warehouse in construction period and operation period under the action of repeated pile of coal, coal unloading of stress and settlement of soil structure and the change trend of reinforced concrete spherical positions for gas film on the bearing capacity of foundation treatment, such as new structure design and material selection and so on to provide reliability, appropriate is used widely in the industry.

In view of the problem that the distance between the roof of the stoping roadway and the overlying goaf layer in the working face of Renlou Coal Mine Ⅱ7324S is less than 6m, the old support mode is not enough to keep the roadway stable under the influence of mining, the destabilization mechanism and control method of the surrounding rock along the wind roadway were studied by using theoretical analysis, mathematical modeling and field monitoring, and the "anchor grouting " integrated high strength coupled support scheme ("three high and two grouting") was proposed in combination with the actual geological conditions. The "anchor grouting " technology is proposed, i.e. high torque force, high preload force, high strength support material, full-length anchor grouting and surrounding rock reinforcement grouting support scheme. The findings indicate that the deformation of the roadway is minimal and the mineral pressure on the roadway envelope is insignificant, and anchor cable in good working order, which ensures the safe production of the working face.

Through the statistical analysis of the ground pretension stress induced by rockbolt pretension obtained by numerical simulation, a practical formula was obtained by data fitting method. Rockbolting desgin for roadway of Sanyuan coalmine was conducted based on the presented formula, and a field test was carried out to verify its effectivness. The results showed that the pretension stress influence radius RP of single rockbolt or cable was positively related to its pretension force P and the negative power index of reinforced arch effect index σP. During the roadway excavation and mining of the working face, not only the axial force of rockbolt and cable but also the roof separation displacement and the surrounding rock deformation were almost the same compared to that of unoptimized roadway. And there were no events affecting the normal production of the working face. The tunneling efficiency was improved, and the investment of support materials and manpower were reduced by introducing the optimized rockbolting support. It had achieved the goal of low density support. The rationality and effectiveness of the rockbolting design by the practical theoretical formula was verified. It could provide a practical theoretical calculation method for the design of rockbolting in coal mines under similar conditions.

Based on the geological and mining technical conditions of coal seam group in close distance, the distribution law of microseismic events and the influence range of roadway lateral abutment pressure during the production period of the upper working face after the mining of the lower protective layer are analyzed and studied by using microseismic data and drilling pressure relief technology. The engineering practice results show that: after the mining of the lower protective layer, the frequency and energy of the microseismic events in the upper coal seam decrease, and the elastic potential energy of the coal and rock mass in the affected area is released, and the lateral abatement pressure of the roadway transfers to the deep coal body, thus realizing the effect of preventing scour and reducing disaster.

Abstract：In order to ensure the safe operation of No. 4 coal face in QINGGANGPING coal mine, taking 42108 fully mechanized top coal caving face in No. 2 mining area as the engineering background, the impact risk of the working face is evaluated based on the impact risk comprehensive index method, the idea of simultaneous monitoring of static load and dynamic load is put forward, and a regional local combined monitoring and early warning system of rock burst risk is established. The regional monitoring adopts microseismic monitoring system, Local detection adopts drilling cuttings method and electromagnetic radiation monitoring, so as to form "comprehensive analysis - real-time monitoring and early warning" from the time dimension; Form a monitoring and early warning technical scheme combining "regional prediction, local monitoring and point prediction" in the spatial dimension, and follow the "strong pressure relief" principle of rock burst prevention and control according to the analysis of impact risk factors and grade evaluation results of 42108 mining face, This paper puts forward the pre pressure relief and active danger relief scheme of 42108 mining working face, including pressure relief of large-diameter borehole in the upper part and pressure relief of large-diameter borehole in the bottom plate. Finally, the effect of the pressure relief scheme is tested by the drilling cuttings method, and the risk of rockburst in 42108 working face is eliminated. It is expected to provide reference for the prevention and control of coal mine rockburst under similar geological conditions.

In view of the problems of poor coal flow transportation, low production efficiency and poor engineering quality caused by frequent upward and downward movement of scraper conveyor in 250107-1 fully mechanized mining face of Huating Coal Mine, this paper analyzes the causes of upward and downward movement of scraper conveyor. The results show that there is an objective upward or downward trace of △l during the movement of the scraper conveyor in the near horizontal fully mechanized mining face, and there is a side thrust along the upward and downward direction of the scraper conveyor. In the process of mining by one-way coal cutting, the deflection of push rod is the root cause of the accelerated upward slide of scraper conveyor and the skew of hydraulic support. In order to restrain the passive situation of continuous upward and downward movement of the scraper conveyor in the fully mechanized mining face, the combined application of the methods of adjusting the pseudo slope of the fully mechanized mining face, the single column auxiliary pushing the scraper conveyor, Side guards adjust the position of the hydraulic support, and the offset transfer machine is adopted in the field, which effectively curbs the harm caused by the upward movement and decline of the scraper conveyor, and ensures the safe, safe and efficient mining of the fully mechanized mining face.

In order to master the influence law of short distance upper coal seam goaf and residual coal pillar on ground pressure behavior of lower coal seam mining face, taking the geological conditions of 10# (lower) coal seam mining face after 9# (upper) coal seam mining in Shanxi as the engineering background, and uses the methods of theoretical analysis, numerical simulation and field measurement, the ground pressure behavior law, roof structure evolution characteristics and support resistance of the working face under the goaf and coal pillar are classified and studied. The results show that: 1) The dynamic load coefficient under the goaf is 19.35% higher than that under the coal pillar when the lower coal seam 1001 working face is pressed periodically. During the non pressure period, the support load under the coal pillar increases by 20.58% on average compared with that under the goaf; 2) When the upper coal seam is mined, the key layer 1 forms an articulated bearing structure. When the lower coal seam is mined under the goaf, the articulated structure loses stability and collapses, and the collapse zone develops upward until the key layer 2 forms an articulated structure to bear the load of the overlying strata; 3) The residual coal pillar in the upper coal seam has strong stability and bearing capacity, and the peak value of floor concentrated stress caused by coal pillar appears in the center line of coal pillar. When the lower coal seam is mined under the coal pillar, the key layer 2 forms a hinged structure to bear the load of the overlying strata; 4) The ground pressure control measures to increase the working resistance of the support are put forward. According to the on-site observation, the slope phenomenon has been improved, and the support can ensure the safe mining of the fully mechanized top coal caving face.

Abstract: The phenomenon of H2S over limit occurrs during the development of 13# coal seam in Shaping Coal Mine. In order to prevent the harm of H2S to workers and affect the safety production, the method of injecting alkali into coal seam is used to treat H2S. The alkali solution with sodium carbonate as the main component is chosen by comparing the absorption effect of different alkali solution. The H2S concentration in the coal water is 150ppm, the H2S concentration in the coal is 130ppm, and the H2S concentration in the air is 30ppm, which belongs to the high H2S coal mine. COMSOL multiphysics software is used to carry out numerical simulation on the process and effect of coal seam alkali treatment of H2S.The simulation results show that: Alkali infusion pressure and alkali liquor diffusion effect are positively correlated, and the longer the alkali infusion time, the greater the diffusion range of the alkali liquor. To achieve better results, we recommend selecting an alkali infusion pressure of 4MPa and an alkali infusion time of 48h, and using porous alkali infusion with a pore distance of 8m. A 30-day alkali injection test is carried out in 13# coal seam. After alkali injection, the concentration of H2S in roadway air decreases from 32ppm to about 3ppm, and the concentration of hydrogen sulfide stabilizes at about 3ppm during mining, indicating that coal seam alkali injection can effectively control H2S over limit.

Coal seams occur coal and gas outburst danger and pressure, the influence scope of mined-out area in goaf of reasonable and effective pressure relief scope and coal roadway with the determination of unloading zone width can be done to reduce unnecessary costs, mine roadway arrangement process and ensure safety, eliminate the drivage efficiency under the condition of gas threat, to coal mining to replace strain of emergencies. Taking Bai Ping coal mine 13091 working face and 13111 working face as the research object, adopting the means of numerical simulation and field measurement of the mined-out area pressure relief scope, determination of coal mining working face pressure relief scope, determine the stripe at the unloading coal lane unloading zone width, can optimize the new working face goaf roadway arrangement. In order to work in the goaf pressure relief range. The research results show that :(1) through the excavation simulation of 13091 working face, the law of displacement and stress of 13111 working face with time and stress with space is obtained, and the influence range of pressure relief of 13091 working face goaf should be within 40m; (2) As the distance between the coal seam gas parameter measuring point and the goaf of 13091 working face is close, the measured coal seam gas content of 13111 working face is gradually decreasing; (3) Comprehensive analysis shows that the effective pressure relief area is within 37m from the goaf of 13091 working face, the area from 37 to 42m from the goaf of 13091 working face is the transition area, and the area beyond 42m from the goaf of 13091 working face is the original area.

In the stratified mining of thick coal, the failure of roof overburden structure plays a decisive role in controlling the stability of roadway and the support stability of working face. In view of the problems such as non-collapse of the hanging roof in the goaf under the condition of direct overburden of thick sandstone roof, large weighting interval, and large impact dynamic pressure after fracture, taking the 13121 upper working face of Gubei Coal Mine as the engineering background, the failure mechanism of the overlying rock structure of thick and hard roof in layered mining is revealed through theoretical analysis, field detection, mechanical test and numerical simulation, and the laws of roof movement, deformation and stress distribution are obtained. The results show that the caving step of thick and hard roof is large, the mining effect is severe, and the plastic zone is destroyed. The engineering performance is large area hanging roof in goaf and large area spalling of coal side. Accordingly, the deep-hole blasting technology of roof cutting and pre-splitting with thick and hard roof was proposed and successfully applied to 13121 upper working face in Gubei Coal Mine, which shortened the initial and periodic weighting interval and effectively controlled the surrounding rock of roadway and stope pressure．

In view of the technical problem that under the action of mining-excavation superposition stress, the catastrophic instability of surrounding rock in the withdrawal channel is frequently caused by unreasonable support timing, which seriously affects the safe and efficient withdrawal of fully mechanized equipment, this paper takes the withdrawal channel of I030901 working face in Qipanjing Coal Mine as the research background, establishes the mechanical model of residual pillar in the five stages of stress evolution of residual pillar, and puts the measured parameters into the formula to determine the initial disturbance range of superposition stress in theory as 102.48m. On this basis, the FLAC3D numerical calculation model is established to invert the stress propagation law in front of the working face and the superposition effect mechanism of the vertical stress above the residual pillars. The results show that the simulation results are consistent with the theoretical results. Taking into account the influence of working procedures and production conditions, the wealth coefficient is 1.5, and it is finally determined that before the width of remaining pillars is less than 150m, the withdrawal channel is advanced reinforced in the field. The field test results show that the influence range of advanced stress is about 100 m, and the simulation results are consistent with the theoretical calculation results.

In order to reveal the internal relationship between coal acoustic characteristic parameters and damage and failure evolution characteristics, the indoor test of coal acoustic monitoring under uniaxial compression is carried out, the variation law of coal wave velocity with strain is obtained, the evolution process of coal surface failure characteristics at different stages is analyzed, and the damage and failure degree of coal is quantitatively characterized by wave velocity, The correlation characteristics between wave velocity and mechanical characteristic parameters of coal at failure precursor point are discussed. The results show that with the increase of axial strain of coal body, the wave velocity shows a trend of stable, slow decrease and then sharp decrease. The surface morphology of coal sample has experienced the change process of no obvious change, small-scale macro failure and complete failure. The damage variable of coal body also shows the change law of almost zero, slow increase and then sharp increase. When the strain level reaches 95.55% and the stress level reaches 95.68%, the wave velocity level of coal body is 96.32%. The coal crack expands rapidly and instability disaster is about to occur.

The fracture strength of the feed of the graded crusher is an important factor affecting the particle size distribution of its products, which is related to the loading mode of crushing. In order to study the fracture strength of the feed of the graded crusher, a point load instrument similar to its loading mode is selected as the test equipment to carry out the point load test on the coal and rock particles with the size of 5 ~ 40mm, and the maximum crushing force and fracture stress of the sample are obtained, which can be used as the fracture strength evaluation index of coal and rock particles during graded crushing. The fracture strength of coal and rock particles in the same group has certain discreteness. Boltzmann model, Weibull model, Lognormal model and Logistic model are selected to fit them, and the model with the best fitting effect is selected to construct the fracture strength distribution model during graded crushing of coal and rock particles. The results show that under the action of point load, the fracture strength of coal and rock particles of the same group is very discrete; Among the four models, Logistic model is the most suitable to construct the fracture strength distribution model of graded crushing. The study of the fracture strength distribution model provides a theoretical basis for the prediction of particle size distribution of graded crushing products.

In order to improve the effect of spray dust control on coal dust control, a magnetic activated water dustfall technology is proposed. Taking the bituminous coal of xindingtai coal mine in Jinzhong City, Shanxi Province as an example, the monomer surfactant was optimized and compounded through the contact angle measurement experiment; Magnetization test of the compound surfactant and water; Finally, the constructed roadway similarity model is used to conduct dust reduction experiments and determine the dust reduction efficiency. The experimental results show that the compound effect of anionic surfactant SAS-60 and non-ionic surfactant AEO-7 is the best. The optimum magnetic induction intensity and magnetization time are 4000gs and 50min respectively. The total dusting rate of magnetized compound active agent is as high as 88.3%, which is 57% higher than that of non magnetized water spray, and the dust dusting rate reaches 79.3%, which is 55% higher than that of pure water spray technology. Through the above research, the mechanism that the contact angle and surface tension of magnetized water show the law of multi extreme increase and decrease is revealed, and the magnetized water circulation system is established to make the magnetization effect more stable and lay a foundation for practical application in the workplace.

Abstract: In order to accurately and quickly predict the coal spontaneous combustion in mine, a classification early warning method of coal spontaneous combustion combined with Bayesian optimization method and XGBoost model was proposed. Based on the experimental data of coal spontaneous combustion in a mine in Shandong province, the early warning grades of coal spontaneous combustion are firstly classified according to the change trend of index gas curve with temperature. Secondly, the data are divided into training set and test set, and the index gases of O2,CO,C2H4,CO/ΔO2,C2H4/C2H6 are selected as the input of the XGBoost model, and the coal temperature grade is taken as the output of the model. At the same time, bayesian optimization is used to optimize the parameters of XGBoost, such as learning rate, n_estimators, maximum depth. The XGBoost model of coal spontaneous combustion classification early warning based on Bayesian optimization algorithm (Bo-XGBoost) is constructed. Then, the test set data is brought into BO-XGBoost, XGBoost, BO-RF, BO-SVM, BO-KNN and other models for comparative analysis. The results show that the prediction accuracy of BO-XGBoost model is 91%, which increased 3%, 9%, 12% than that of BO-RF, BO-SVM and BO-KNN respectively. Finally, the applicability and stability of the BO-XGBoost Algorithm are further verified by its application in the early warning of spontaneous combustion classification in a mine in Tangshan. The results show that the BO-XGBoost model is more suitable for the early warning of coal spontaneous combustion.

In order to reveal the influence of different excavation section shapes on the stability of surrounding rock of the gob-side coal-rock roadway in inclined coal seam and further guide the optimization design of this kind of roadway. Based on numerical simulation, the surrounding rock plastic zone distribution and deformation characteristics are studied after the excavation of three kinds of type roadway section, including inclined roof echelon, vertical wall semicircle arch and inclined wall arc roof. The result show that: comparaed with the inclined roof echelon and straight wall semi-circular arch, the excavation of the inclined wall arc roof is more benefical to the surrounding rock deformation control of the gob-side coal-rock roadway in inclined seam; The influence of excavation on surrounding rock deformation and damage is different for inclined wall arc roof of roadway with different angle of outward and the inclined wall arc roof with an outward 10° had the smallest deformation of the surrounding rock after excavation, which was the relatively ideal roadway section shape. Based on the above results, it was determined that the 1511 return air roadway of a mine in Guizhou province was excavated with inlined wall (10°) arc roof.The laser roadway section detector was used to detect the deformation of the whole roadway section during the service period, the maximum shrinkage rate of section is 23.3%, and the overall uniform deformation of roadway further verifies the reliability of the research results.

In order to improve the power quality of shearer power supply system, the static var generator (SVG) is selected as the compensation scheme of electric traction shearer reactive power compensation and harmonic suppression. The traditional PI control SVG is difficult to deal with the load mutation caused by the different coal seam hardness of the electric haulage shearer. The linear active disturbance rejection control (LADRC) strategy is proposed. The linear extended state observer (LESO) is used to observe and compensate the variable coupling terms and external disturbances in the SVG model,and the current loop linear active disturbance rejection controller and voltage loop linear active disturbance rejection controller of SVG are designed. The simulation results show that the grid-side voltage and current are in the same phase after the designed SVG compensation device is put into the shearer, which reduces the harmonic content of the grid-side current of the shearer and improves the power quality of the underground power supply system. Compared with the traditional PI controller, the LADRC controller effectively improves the compensation performance of the SVG compensation system.

The intelligentization of mechanical equipment in fully mechanized mining face is an attractive field, and abnormal detection of mechanical equipment, as an indispensable part, has broad application scenarios. However, the following problems are faced in practical applications. One is that unexpected anomalies encountered in the actual environment bring challenges to data labeling; the other is the imbalance of data categories caused by too little abnormal information. In this paper, a shearer anomaly detection method based on self-encoding twin neural network is proposed, and a weak label data set is constructed by combining shearer working condition information to solve the first problem. For the second problem, build the LCAS (LSTM-CNN Auto-Encoder Siamese) neural network, reduce the impact of class imbalance on training through the twin neural network, and combine the LSTM and CNN auto-encoder neural network for feature extraction to improve model accuracy when diagnosing time series data. The test results of the model show that the model can effectively extract high-quality features, has good robustness against unbalanced data, and the model has a certain generalization ability, which is effective and practical.

Mine flood accidents are closely related to the geological structure of the minefield. Scientific evaluation of the complexity of the mine structure is of great significance to the safe mining of the mine. Taking Xiaoyun Coal Mine as the research object, Select the value of fault fractal dimension, fault density, the number of fault pinch points and intersections, and fault strength index as the evaluation indicators that affect the structural complexity of the mine,An improved stacking algorithm (Stacking) based on gray correlation degree (GRD) for index weighting calculation, Obtain the weight of the main controlling factors of the mine structure complexity, and establish the quantitative evaluation model of the mine structure complexity. The study area is divided into structural failure zone, structural influence zone and stratum intact zone. The core sampling rate verifies the validity and rationality of the zoning pairs of structural complexity. The results show: The evaluation results are consistent with the core adoption rate verification results, and are basically consistent with the actual exposure of the coal mine, which proves the rationality of the evaluation model and provides a guiding basis for the efficient and safe production of the mine.

Mastering the indigenous microbial community structure and function in in-situ coal seams is an effective way to explore and control the biotransformation of in-situ coal seams. In order to accurately reflect the in-situ flora, newly exposed coal samples at different burial depths were collected using geological drilling. Through 16S rRNA and 18S rRNA high-throughput sequencing, the Alpha diversity, community composition and differences of the bacterial, archaeal and fungal communities in in-situ coal samples were analyzed. Finally, secondary function prediction was performed based on KEGG and MetaCyc databases. In the in-situ coal samples, the microbial community richness decreased with increasing of coal sample burial depth. Among them, bacteria identified 27 phyla, 67 classes, 159 orders, 267 families and 468 genera, with Proteobacteria and Aquabacterium as the dominant phyla and genera. Archaea identified 6 phyla, 14 classes, 21 orders, 26 families and 31 genera. The dominant phyla of archaea were Euryarchaeota, Asgardaeota and Crenarchaeota, and methanobacterium was found among the dominant genera. The fungal community obtained 20 phyla, 38 classes, 52 orders, 66 families and 72 genera; the dominant phyla of fungi included the Streptophyta, Ascomycota and Colpodellidae, and the dominant genera were Zea, Colpodella and Saccharomycopsis. The main functional prediction of microbial communities was the metabolism of substances and energy required to maintain basic microbial life activities. The research results will provide a reference for the preferential selection of coalbed methane bioengineering blocks.

Aiming at the problem of coal gangue sorting, a target detection algorithm based on deep learning is proposed to replace manual gangue sorting. At the same time, a coal gangue image data expansion method based on deep convolution generation countermeasure network is proposed. Through experimental analysis, it is found that the improved yolov4 algorithm using k-means initial anchor frame parameters and adding a detection channel can overcome the defect of missing detection of small coal gangue, At the same time, the detection accuracy of the target detection model is improved.

Considering that the flip-flow screen panel under heavy load is in tension, and ignoring the difference of the screen panel movement in the width direction, an elastic string model is established for the horizontal flip-flow screen panel driven by one end, furthermore, the differential equation of the screen panel lateral vibration is derived. Using the numerical method to solve the vibration differential equation, five detection points are arranged in the length direction of the screen panel, comparing the calculation results with the simulation results of the finite element software ABAQUS, it is found that the relative error between the calculated and simulated displacement and time curve of each detection point is small, and the lateral movement period is approximately equal to the excitation period; At the midpoint of the screen panel, the relative error between the calculation period and the simulation period does not exceed 0.2%; Comparing the average amplitude of ten cycles at the midpoint of the screen panel, it is found that the relative error is no more than 12.8%, which verifies the feasibility and accuracy of the elastic string model to analyze the lateral movement of the flip-flow screen panel under heavy load.

The underground mining environment is complex and diverse, and the stress state of hydraulic support is severe, which puts forward higher requirements for the bearing performance of hydraulic support. In order to study the bearing capacity of hydraulic support under different loading conditions, the change trend of hinge point load of hydraulic support is analyzed. Based on ZF5600/16.5/26 top coal caving hydraulic support as an example, the dynamic model of the hydraulic support is established by using LS-Dyna, the rigid joint area is established at the hinge, and the rotation pair connection is defined to transfer the force. Subsequently, combined with different loading forms and loading conditions, the numerical simulation analysis of hydraulic support was carried out. The results show that the stress concentration of top beam is in the front column nest and the rear column nest under internal and external loading, respectively; the load of hinge point fluctuates greatly and the peak value is much larger than the stable value under internal loading; under eccentric loading condition, the load fluctuation of hinge point is the most violent; in different working conditions, the load at the hinge point of the rear connecting rod needs the longest stability time in the force transfer process. The research results can provide reference for structural strength design and reliability analysis of hydraulic support.

Aiming at the problem of mine robot working under the ground, in order to improve the obstacle-surmounting performance of the robot in the non-structural complex ground environment, a swinging-arm type detection-rescue robot is designed and developed this paper. Based on the robot mobile platform, the dynamic modeling of the robot swing-arm and ontology is carried out, and the mechanism and motion mode of the platform swing-arm module are studied, the relationship between the robot's barrier height and the robot's geometric parameters is analyzed, and the maximum barrier height of the robot under the assistance of the front and rear swing arm components is analyzed. Studies have shown that the maximum obstacle-surmounting performance of the robot is 463 mm, and the actual maximum obstacle-surmounting performance in the experiment is 467 mm. The results of outdoor experiments verify the validity of theoretical analysis and are beneficial to automatic obstacle-surmounting control and intelligent detection and rescue.

Henan Province has a long history of coal resources development and high mining intensity. In recent years, the development potential of coal resources is seriously insufficient. It has changed from the traditional net transfer out area of coal to the large-scale net transfer in area. This paper deeply analyzes the coal production, transportation and demand in Henan Province in recent years, and uses the four coal consuming industry methods to predict that the coal demand in Henan Province will drop to 180-190 million tons at the end of the 14th five year plan and the 15th five year plan. Combined with the information of remaining recoverable reserves, production capacity and remaining service life of coal mines in Henan Province, it is predicted that the coal production capacity of Henan Province will drop to 114-117 million tons at the end of the 14th five year plan and the 15th five year plan. It is expected that in the future, Henan Province's coal dependence on other provinces will continue to increase and the pressure of ensuring supply will continue to exist. This paper puts forward countermeasures from the aspects of stabilizing regional production capacity, ensuring coal source supply and improving storage and distribution system.

In this paper, the interaction mechanism of complex behaviors between local governments and coal enterprises under the carbon neutrality objective is investigated using evolutionary game theory. The evolutionary game model and preliminary conclusions are validated using numerical simulations. Finally, the effects of the initial probability choices of both sides of the game on the evolutionary stabilization strategy and the sensitivity analysis of the selected parameters are discussed. The results show that (1) local governments play a key role in promoting low carbon development in coal industry; (2) the probability of occurrence of the ideal game strategy group is positively correlated with local governments' penalties, subsidies to coal enterprises, coal enterprises' revenue, additional government revenue, and negatively correlated with regulatory costs and improvement costs. And based on the analysis results, we propose relevant policy recommendations.