Aiming at the problems of coal under village and solid waste emission disposall and surface subsidence control caused by high intensity mining in ecologically fragile areas of western China, a short-wall continuous mining and filling cemented filling mining technology was proposed. The technical connotation and technology of mining and filling were expounded, and the composition and strength of filling material were analyzed. The ratio of gangue ( slag ), fly ash, gypsum, cement and mine water suitable for the engineering site was determined as 74: 2: 2: 7: 15, and the slurry concentration was 85%. Under this ratio, the uniaxial compressive strength of filling body could reach about 3.1MPa. The composition of the filling system of the technology is proposed, including the gangue transportation system, mud preparation system, monitoring system and working face filling system. The engineering application shows that the filling rate of 5.25m thick coal seam can reach more than 98% by using this technology, and the maximum ground subsidence is about 180mm. It can deal with 400,000 tons of industrial solid waste, and the filling effect is good.

This paper studies the problem that the mobile roof pedrail powered support is being desalinated in Wongawilli short-wall mining, and introduces the process from import to localization of support and its application effect. In addition, this paper analyzes its configuration and necessity in different short wall mining methods, and optimizes the calculation formula of support resistance on the basis of previous achievements. Through numerical simulation, the support resistance of the support in different positions of the same branch entry and different width of cut pillars, and the distribution and variation law of each single mast pressure were studied. Then the influence of goaf side and entity coal side on mast pressure was obtained. The relationship between the support resistance and the main influencing factors is comprehensively analyzed, and the column pressure is monitored and analyzed in the field practice, which verifies the correctness of the theoretical analysis. Finally, the key practical technology of crawler hydraulic support in fractured zone is given. The results show that the roof caving without cutting of the branch roadway behind the hydraulic support is still an important guarantee for the safety of short wall mining. The theoretical calculation formula of support resistance . And the pressure of the four columns has a positive correlation with the size of the goaf and the width of the coal pillar between the knives. The pressure of columns in goaf side is obviously higher than that in entity coal side. The change of side pillar pressure is the key to analyze and predict the change of roof pressure and load in goaf. In addition, the actual working resistance of side column is smaller than that of simulation. The support crusing can be solved by the following ways, such as strengthening roof support, reinforcement support of caving gangue pile, ground anchor support, grouting reinforcement, and at the same time, the support is pulled out by the traction force of the prop pulling hoist.

In the project, BIM Technology has the advantages of design scheme visualization, collaborative design process, 3D modeling, collision detection, post operation and maintenance, etc.Referring to the use of BIM Technology at home and abroad, combined with the application process of BIM Technology in the design of coal preparation plant, and through the use of various disciplines in the design of coal preparation plant, this paper analyzes the advantages and challenges of BIM Technology in the process of industrial design.It provides reference experience for BIM Technology in coal preparation plant and similar industrial engineering design, construction, operation and maintenance,and provides a certain reference for BIM Technology Development in the future.

With the design of xiaobaodang coal preparation plant of Shaanxi Coal Chemical Group Co., Ltd., accurate coal quality analysis and product positioning, applicable coal preparation methods, optimization of process layout, and adoption of domestic and foreign advanced washing equipment, take the road of combination of automation and intelligence. After the coal preparation plant is completed and put into operation, the economic, social and environmental benefits are remarkable. It has become a modern super large coal preparation plant which adapts to coal quality, high production efficiency, intrinsic safety, scientific management, civilization and harmony. This coal preparation plant is a super large coal preparation plant designed and built at one time, which provides reference and reference for the design and construction of Yushen mining area's subsequent super large coal preparation plant.

This paper analyzes the characteristics of different environmental transportation systems and puts forward the concept of mobile network for intelligent open-pit mine transportation equipment.The importance of real-time spatial information in the research and application of intelligent open-pit mine and automatic driving is discussed, and the corresponding model is proposed.According to the proposed model, the data set of transport equipment big data in open-pit mine is designed specifically: trajectory data, in which the location and attributes of objects will change with time;Temporal data collected at a fixed location.In order to analyze the diversity of data, the visualization of "time, space, time fusion and multidimensional information" is discussed.Based on the existing actual cases, the representative software and hardware systems of mining transportation big data in China are summarized, and the existing problems and future research direction are suggested.

Abstract: In order to ensure the installation of large mining equipment in fully mechanized mining face, large section cut roadway is needed. However, it is always difficult to solve the problem of how to quickly form and stably support large section cut roadway. The construction technology of one-time roadway formation by step excavation is proposed, that is, the roadway with the first construction width of 4000mm is constructed. After one shift, the remaining 2100mm width from step to the second construction is cycled back and forth, avoiding the cross operation of secondary wall expansion and installation and saving time. The active support parameters of steel belt and steel mesh support on anchor bolt (cable) are adopted to effectively control the deformation of surrounding rock. The maximum subsidence of roof is 130mm and the maximum displacement of two sides is 164mm. In the process of on-site excavation, there has never been a safety accident. The use of this technology improves the excavation efficiency and ensures the safety.

Abstract: Aiming at the problem of long-term stability of surrounding rock of coal mine TBM tunnelling, with TBM tunneling a gas drainage tunnel in Huainan mining area as the engineering background, time-effect deformation analysis of tunnel surrounding rock and optimization of support parameters were carried out. CVISC creep parameters are obtained by drilling sandy mudstone samples at the construction site of TBM tunnelling tunnels, carrying out creep tests, and introducing CVISC creep model into FLAC-3D numerical simulation software to carry out TBM tunnelling tunneling under different supporting conditions the surrounding rock is subjected to a 100-day creep deformation simulation, and the time-dependent deformation characteristics of the surrounding rock of the roadway under various supporting conditions and the evolution law of the stress field and the plastic distribution area are obtained. The analysis shows that the bolt + steel mesh combined supporting system can resist resistance the time-dependent deformation of the surrounding rock of the roadway is more effective; based on the results of the numerical simulation, the optimized bolt + steel mesh support system is applied to the TBM construction roadway, and the surrounding rock deformation monitoring and the bolt axial force monitoring of the TBM construction roadway are carried out. Verification based on actual measurement results. The field test results show that the optimized support scheme adopted can effectively control the surrounding rock deformation and the roadway stability is good. The research results can provide technical reference for the stability control of surrounding rock and the design of support parameters for deep soft rock TBM tunnelling.

In view of the problems of unbalance of excavation-anchor and low efficiency of roadway formation in coal mine, by means of theoretical analysis, simulation and field test, the adaptability of shield tunneling and matching of construction system of full-section hard rock machine in coal mine are analyzed. Four aspects of problems affecting the construction efficiency of shield tunneling in vertical coal mine are proposed. It includes shield machine access to vertical shaft, equipment rapid assembly and transportation technology, shield machine trajectory control and rapid support. Combined with the existing conditions of the mine, the shield equipment assembly and disassembly platform of the underground large chamber was designed, the construction technology and labor organization management were optimized, and the shield construction technology system with multi-process coordination and unity of digging, supporting, assembling, transferring, transporting and spraying was formed. The research results were applied for the first time in rock roadway of Yangquan high gas vertical shaft coal mine, which realized the highest monthly and daily footage of rock roadway 608m and 31.5m, and created the level of rock roadway forming 3490m in a single tunneling and a single tunnel forming, improved the efficiency of rock roadway forming, shortened the mine preparation period, and achieved significant technical and economic benefits.

In view of the characteristics of Changping coal mine bottom drainage with large deformation, short service life and potential roof collapse, the comprehensive control technology of "steel prestressed grouting anchor cable net shotcrete" is put forward. By field test and laboratory test, the structural and strength characteristics of mudstone in bottom drainage were clarified, and the instability mechanism of fractured mudstone in bottom drainage was revealed. The effectiveness of the proposed comprehensive control technology was verified based on numerical simulation and field test results. The results show that the mudstone of No.3 coal floor drainage tunnel in Changping coal mine has the characteristics of structural fissure, low strength, easy weathering, water softening and remarkable creep characteristics. The deformation of floor drainage roadway induced by dense boreholes and water immersion creep can be well controlled by the presented surrounding rock control technology, which ensures the safe and efficient mining.

Abstract: Aiming at the problem of increasing anchor failure rate of high ground temperature and high ground pressure anchorage support in deep soft rock roadway, taking deep soft rock roadway in Huainan mining area as an example, the indoor similar simulation test method was used to study the deformation and failure characteristics of anchor solid and the stress characteristics of anchor under the coupling effect of temperature and pressure. The results show that with the increase of temperature and lateral pressure coefficient, the fracture depth of anchorage body increases, while the increase of lateral pressure coefficient decreases the fracture angle of anchorage body. When λ = 1.2, 1.5 and 1.8, the fracture depth of the anchorage body is 1.02～1.2, 1.13～2.2 and 1.15～2.4 times of the tray diameter, and the fracture dip angles of the anchorage body are 45°～60°, 40°～45° and 30°～35°, respectively. With the increase of temperature and lateral pressure coefficient, the horizontal deformation of the anchorage increases in the compaction stage. With the increase of lateral pressure coefficient, the influence of temperature on the deformation and failure of the anchorage is weakened. The bolt is in the complex stress state of compression, tension and shear under the action of broken blocks. The bolt is mainly subjected to tension stress, and the bending position is compressed and shear stress. With the increase of temperature and lateral pressure coefficient, the bending position of the bolt is compressed and the shear stress increases, and the bolt has obvious bending deformation. Bolt anchor solid progressive failure. The full-length anchoring support technology is applied to the optimization design of the surrounding rock support parameters of the main roadway of the Western Third Railway, and the field monitoring is carried out. The feedback shows that the surrounding rock support effect of the roadway is good.

Condition monitoring and on-line fault diagnosis of hoist in the actual industrial scene, insufficient labeled fault samples and the distribution difference between testing and training samples caused by variable working conditions are important reasons that restrict the application of intelligent fault diagnosis algorithm in practical engineering. This paper proposes a transfer fault diagnosis architecture combined edge node for actual hoist, including multi-source data perception layer, edge node layer, network layer and central cloud server layer. Taking the hoist bearing as the object, a deep transfer fault diagnosis algorithm based on ResNet and multi-core joint distribution discrepancy is proposed to realize the fault state recognition of hoist under variable working conditions, two kinds of bearing fault data are used to verify the effectiveness and adaptability of the algorithm. The results show that the proposed algorithm can achieve the ideal transfer fault diagnosis accuracy. Finally, a hoist detection and diagnosis platform is designed and constructed, which is deployed in the coal mine ground central cloud server center to realize the monitoring of the running state of the mine hoist and online diagnosis.

The 21606 working face of Qinglong Coal Mine adopts the entry retaining by roof cutting technology, and the ventilation mode is the "Y" ventilation mode of "one inlet and two return". Facing the problems of wide air leakage range and large air leakage in the goaf, it is very easy to cause the residual coal in this face and adjacent goaf to ignite naturally.In this regard, taking 21606 working face as the research object, firstly, the distribution of air leakage field in goaf with entry retaining by roof cutting is studied through COMSOL numerical simulation. The numerical simulation results show that:Under the "Y" ventilation mode of entry retaining by roof cutting, the air leakage wind speed in the goaf decreases significantly along the direction away from the fully mechanized mining face. The air leakage path in the goaf mainly enters from the lower corner and flows through the goaf to the upper corner and the ventilation eye.The air leakage prevention measures taken for different areas mainly include: building walls and shotcreting at the cut-off roadway and ventilation vertical hole; The roof cutting blasting is carried out in the working face to accelerate the roof collapse; Sand bag wall shall be built at the upper corner of the make-up track and the track, and Schmidt air leakage proof material shall be sprayed; Shotcreting shall be carried out at the cut hole and make-up cut hole, and the gas drainage hole of the cut hole shall be blocked in time; And spray inhibitor, pressure gel injection and other measures.Through the above comprehensive air leakage prevention measures, the safe mining of the working face is ensured.

Aiming at the problem of gas control in goaf of outburst coal seam, taking the 12110 working face of Shoushan No. 1 Mine as the test background. The caving characteristics of the roof of hard overlying coal seam are studied by using the coupling theory of crack field and gas field. The study found that the caving steps of the Dazhan sandstone and the fragrant charcoal sandstone in the roof of the working face are quite different, and the gas enrichment area in the goaf is formed under the caving step. By means of the comparison method, a near-field gas extraction technology in the goaf based on the roof strike long borehole is proposed. The test results show that the gas flow rate of the long drilling hole in the roof direction is 8.3m3/min. Under the coordinated extraction with the high-drainage roadway and the upper corner buried pipe, the gas high value of the upper corner is controlled below 0.6%, which ensures the work. High-quality recovery.

Belt conveyor plays an important role in enterprises such as mines, ports due to its fast speed, huge transport volume and long transport distance. Conveyor belt rip occurs from time to time, and if the alarm is not given in time, the entire belt frame structure will be severely damaged. It will directly lead to huge economic loss and even threaten the safety of workers. Based on the analysis of the characteristics of belt tear, the commonly used methods for conveyor belt rip detection were summarized in this paper, the basic principles, advantages and disadvantages of the methods were discussed, and the development direction of the detection of conveyor belt rip was summarized and prospected.

In order to study the optimal proportion of double filling wall along goaf retaining wall and its influence on roof gas leakage of working face, Taking the 2603 working face of Zhangcun Coal Mine as the engineering background, By preparing cubic composite samples with different proportions of concrete and high water material, the optimal proportions were selected from the study of mechanical properties and macroscopic fracture forms of the composite samples with different proportions,and based on the characteristics that the upper soft layer can fully connect the roof and prevent the upper gas leakage, the gas concentration of the roadway is monitored.The results show that when the proportion of high water material is 10%, 20%, 30%, 40% and 50%, the peak strength of the concrete decreases by 18.95%, 44.23%, 52.31%, 60.78% and 79.68%, respectively, compared with the peak strength of pure concrete. When the proportion of high water material is less than 20%, the combined specimen has the effect of letting pressure while ensuring a certain strength.When the proportion of high water material is more than 20%, the high proportion of soft stratified material will reduce the supporting effect of high strength material at the bottom, thus affecting the overall strength of the specimen. The application results show that the gas concentration can be effectively reduced and the effect of roadway retention is good.

Taking the proposed backfill face of Renjiazhuang Mine as the engineering background, through similar material simulation experiments, this paper statistically analyzes the parameters such as the number, angle, length and width of overburden fractures, and studies the temporal and spatial evolution law and distribution characteristics of overburden fractures in backfill mining. The results show that the excavation and backfill distance of coal seam is short, and the low-level rock stratum near the coal seam first produces transverse fractures, with a small number and a nearly horizontal angle. With the increase of excavation and backfill distance, the number and length of transverse fractures increase. The non penetrating longitudinal fractures derived from transverse fractures are basically distributed in the area at the junction of coal pillar and goaf. Their length is relatively short and the angle is generally greater than 180 °. The overburden fractures gradually develop and expand from low-level rock stratum to high-level rock stratum, and the fracture distribution range gradually expands. The fracture development at the key stratum is hindered to a certain extent. The fractures in the overburden in the middle of the mining and backfill area shrink and close, slowing down the increase in the number of overburden fractures. The fracture width of overburden after stopping mining is generally less than 0.8mm. From both ends of the fracture to the middle, the fracture width first increases and then decreases; The width of overlying rock fracture at the mining starting position is larger than that near the stopping position. Finally, the control factors of overburden fractures in backfill mining are analyzed from the aspects of stope backfill rate, mechanical properties of backfill body, backfill layout, working face parameters, overburden structure and roof lithology. The research results are of great significance for further understanding the development and evolution of water conducting fractures and water retaining mining.

In order to study the influence of ditch mining speed on the movement and deformation of the overlying strata in shallow coal seams, the Anshan mine field in the Miaohagou mining area in northern Shaanxi was taken as the research object, and the ditch model was established using Rhino3D-FLAC3D coupling technology. The 6m/d and 8m/d advancing speeds are numerically simulated, and the influence of different mining speeds on the deformation of the overburden was discussed. Research shows that: when the coal seam is excavated at a speed of 4m/d, The height of the water-conducting fissure zone, the surface subsidence value and the horizontal movement value are 42.2m, 1.67m and 0.2m respectively; When the coal seam is excavated at a speed of 8m/d, the height of the water-conducting fissure zone, the ground subsidence value and the horizontal movement value are 32m, 1.01m and 0.14m, respectively, Compared with mining at a speed of 4m/d, the height of the water-conducting fissure zone, the value of ground subsidence and the value of horizontal movement have been reduced by 24%, 40% and 31%, respectively. As the mining speed increases, the amount of overburden movement and deformation decreases. Therefore, in order to reduce the amount of movement and deformation of the overlying rock during the mining process, in the coal mining process, the coal seam advance speed can be appropriately increased according to the actual situation.

Abstract: In order to study the development law of overburden failure height under repeated mining in multiple coal seams, taking the mining of No. 3 coal seam in Gongwusu coal mine as the engineering background, the height of overburden water conducting fracture zone during single-layer mining and repeated mining is obtained through field measurement and numerical simulation. 3DEC numerical simulation studies the failure characteristics of overburden under single coal seam mining and repeated mining, The fracture development mechanism of overlying rock under repeated mining and the calculation method of fracture zone height are analyzed theoretically. The results show that the combination of borehole flushing fluid observation and borehole peeping is more accurate. Under the condition of repeated mining of Gongwusu 16 coal, the split mining ratio is 15.14 and the collapse mining ratio is 3.15; The simulation shows that the fractures on both sides of the goaf are obviously developed and discrete, the middle fracture is closed, and the fracture height is close to the measured value; Three kinds of calculation methods for the development height of repeated mining fracture zone are put forward, which provides a theoretical basis for determining the development height of overlying rock fracture under the condition of repeated mining.

In order to reveal the influence of coal deformation on the seepage law of gas drainage, a study on the gas-solid coupling law of coal seam gas drainage was carried out. Considering the changes in coal adsorption deformation, pore pressure and permeability, and assuming that the gas migrates by Darcy flow, a gas-solid coupling equation of coal seam gas seepage and coal deformation with effective stress and adsorption strain as the coupling medium was established. Taking the field conditions as the background, numerical analysis was carried out on the displacement, adsorption strain and gas seepage characteristics of the drainage coal seam, and the coupling effect of gas pressure, permeability and gas drainage volume was compared and analyzed. The results show that the displacement of the coal seam around the borehole increases after drainage, the coal body shrinks and deforms due to gas desorption, and the closer it is to the drainage hole, the greater the strain; The gas pressure drop gradient in the coal seam at the initial stage of drainage is larger; After drainage, the coal seam permeability shows an increasing trend, the closer it is to the borehole, the greater the increase. When considering the coupling effect, the overall trend remains the same but the increase decreases; the gas drainage volume in the initial borehole is larger but the decrease is faster, and then tends to stable. Compared with the actual drainage volume, it is found that the model calculation results are more consistent with the actual drainage data.

The releasing-hole size of bolting shotcrete in deep gateway influenced directly stress releasing and bearing strength of bolting shotcrete. Uniaxial compression test was produced on twelve cement specimens with six different hole size by rigid test machine, the stress-strain relationship of different hole-diameter specimens was analyzed, the effect of different hole size on specimen compressive strength, axial strain and elastic modulus, poisson ratio, was studied, and failure form and instability mode of cement specimens with different hole size were discussed. The results showed that: the larger the diameter of the pore cement specimen, the angle between the main fracture surface and the horizontal surface increases obviously, and the smaller the fracture bonding area of the specimen. The stress-strain curve of uniaxial compression cement specimen with different-size horizontal hole was whole, the larger the compressive strength was on the specimen, the larger the axial and horizontal strains were. As hole-diameter was from 0mm to 50mm, the compressive strength and elastic modulus reduced, the decreasing trend was slow down, and the attenuation rates were respectively 52.7396%, 22.31%and 34.6282%, the relationships between hole size and compressive strength, axial strain and elastic modulus could be represented by negative liner functions, but the linear relationship decreases. The crack in cement specimen with 0mm to 20mm hole-diameter started at the hole-walls in the upper and lower diagonal angles of specimen, the specimen was damaged at diagonal crack of hole-walls in the upper and lower diagonal angles, which was named small hole-size failure form. The crack in cement specimen with 30mm to 50mm hole-diameter started at the walls in the left and right holes of specimen, the specimen was damaged at both sides of hole-walls in vertical split, which was named large hole-size failure form. The instability mode of cement specimen with different-size horizontal hole was divided into shear dislocation instability and planar splitting one.

A separate water-stop device installed in the hole was developed, in order to solve the problems of large depth, small number of surface hydrological monitoring holes and relatively insufficient density of monitoring points in the eastern mining area in China. , Corresponding hole-forming and well-flushing technical requirements and installation were proposed. The operation process formed a set of double-layer monitoring technology and equipment suitable for long-term groundwater monitoring of coal mines. The research results effectively improved the utilization of ground monitoring holes and increased the density of monitoring points. The researched separate water-stop equipment is simple to produce, suitable to various hole formations, and is easy to install and operate. It can be installed in both new geological exploration holes and hydrogeological exploration holes, and can be installed in the original mixed-layer monitoring holes, with a little transformation into double-layer monitoring holes. The technology and equipment have been verified in the ground monitoring hole of a mine in Shandong Province. The monitoring results show that there is a significant difference in the monitored water levels of the upper and lower aquifers of the double-layer monitoring hole, the water level trend is completely different, and there is no cross layer phenomenon between the upper and lower layers. The purpose of double monitoring of one well is successfully realized. The equipment has the advantages of simple processing, low hole forming requirements and simple installation and operation. It is suitable for installation in all kinds of boreholes in coal mine area and has high practical value.

In order to study the source and formation mechanism of high fluorine groundwater in buertai coal mine, the characteristics and distribution law of f-mass concentration in high fluorine groundwater are studied by means of mathematical statistics and ion analysis in the aspects of mineral dissolution and precipitation, evaporation and concentration, ion exchange and competitive adsorption. The results show that the range of C (F -) in groundwater of buertai coal mine is 0.31-11.15mg/l, and the average value is 1.7mg/l. In terms of spatial distribution, high fluorine groundwater is mainly distributed in the range of 1-5mg / L, accounting for 48.48% of the total samples; In terms of vertical distribution, high fluorine groundwater is mainly distributed in Jurassic aquifer group. The main recharge sources of water in high fluorine goaf are Quaternary and tertiary pore water and Jurassic pore and fissure water. The dissolution of fluorine-containing minerals is the main control factor of high fluorine groundwater. Ca2 + has a strong ion exchange reaction with Na + and K + in the solid phase, and the competitive adsorption of HCO3 - replaces F - adsorbed on the surface of clay minerals, promoting the enrichment of F -.

Based on the statistics of coal mine safety production accidents in China from 2000 to 2021, the following accident characteristics are obtained: ① after 2002, the number of coal mine accidents and deaths in China decreased rapidly with an average annual rate of 18.4% and 17.6% respectively. ② The proportion of major accidents, major accidents and ordinary accidents is generally stable at 1:4:45, which shows that to effectively prevent major accidents, we must start from resolving ordinary accidents. ③ In recent five years, roof, transportation, other and gas accidents are still frequent, and gas, roof, water and fire accidents are easy to cause mass casualties. ④ Accidents occurred frequently in May, and major accidents occurred frequently in January, November and December. ⑤ Landslides in safety management of some key state-owned coal mines and violations of laws and regulations in township coal mines are still the main causes of group injuries.

In order to reduce the weight of the round link chain of the scraper conveyor and improve the contact state between the links, the finite element contact analysis on the round link chain was carried out through ANSYS Workbench, and the topology optimization collaborative response surface optimization method was used in the optimization research of the chain link. The research results show that: during the tension of the circular chain, there are obvious stress concentration phenomena at the contact parts between the two links and the transitional connection between the straight cylinders and the circular links, and the maximum equivalent stress and equivalent strain are 400.04 MPa and 0.00195 respectively. Without compromising the stiffness of the chain link, topology optimization reduces the mass of the chain link from 2.841 kg to 2.733 kg, which is a reduction of 3.70%, but does not improve its contact state; On the basis of topology optimization, response surface optimization is used to perform the second optimization on the chain link. And response surface optimization reduces the weight of the chain link to 2.743 kg, which is a reduction of 3.35%. At the same time, the maximum equivalent stress and maximum equivalent strain of the link are also reduced by 6.08% and 6.67%, respectively, which improves the contact state.

Topographic reconstruction is the foundation and the key of land reclamation and ecological reconstruction in the ecological restoration of abandoned mines. The stability and coordination of the topographic reconstruction has an important effect on soil reconstruction and vegetation reconstruction. The abandoned Coal Mine of JinFeng in Jinsha County which is the experimental pilot of land reclamation and ecological reconstruction, the coal resource is exploitation and utilization, is taken as a study case. In this study, the particularity and fragility of karst landforms has been taken into consideration, we take an adjacent watershed with balanced erosion as a reference. Using 3S(GIS、GPS、RS) technology and GeoFluv model, the first step is topographic reconstruction which is similar to the reference watershed with the long-term stability erosion and is integrated with the surrounding landscape visually and ecologically. The second step is to evaluate the feature of the topographic reconstruction and to analyze the balance between excavation and filling. The results showed that the reconstructed topography is similar to the reference watershed in terms of shape characteristics and channel geometry. There are differences in terms of basin structure characteristics. The main differences are the maximum height difference and the average slope reduction. It's good for restoring the stability of the topographic reconstruction. On the other hand, the volume of the cuts is just 33806.32m3 more than the volume of the fills, it is beneficial to the stability of the foundation after topographic reconstruction and to reduce the cost.

In order to find out the effect of different combinations of bacteria pretreatment on biomethane conversion from lignite, phanerochaete chrysosporium, pseudomonas and streptomyces viridosporus were selected to carry out biological pretreatment and biogas production experiments of lignite. The biogas production detection and Gompertz equation simulation method, the effects of different combination strains pretreatment on lignite biogas production were discussed. The results showed that the biogas production of lignite increased significantly after microbial pretreatment, with the maximum increase of 127%. According to the results of different pretreatment sequence of the same strain, the pretreatment sequence of streptomyces viridosporus + pseudomonas and pseudomonas + phanerochaete chrysosporium was better. Compared with the pretreatment results of the same strain before that of other strains, the pretreatment sequence of pseudomonas + phanerochaete chrysosporium was better than that of pseudomonas + streptomyces viridosporus. The Gompertz equation for gas production fitting, it can be seen that coal samples pretreated by different strains have greater maximum methane yield and cumulative gas production potential.

Aiming at the problems of unobvious fault characteristics, serious noise signal interference, and wrong and missing selection of single-phase grounding fault in the mine power supply system grounded by the arc suppression coil, a line selection method for single-phase ground fault based on Complementary Ensemble Empirical Model Decomposition (CEEMD) and autocorrelation threshold denoising was proposed. This method combines CEEMD with autocorrelation threshold denoising,and fault line selection is simultaneously completed according to the instantaneous am-plitude and instantaneous phase criteria.The system model was constructed using Real Time Digi-tal Simulator (RTDS),a large number of simulation tests were carried out under different fault point grounding resistance, fault initial phase angles, fault point locations and fault lines. The results show that this method, not affected by fault factors, has a better denoising effect than or-dinary denoising methods, and has high line selection accuracy and reliability. Therefore, this method is particularly suitable for single-phase grounding fault line selection of the mine power supply system grounded by the arc suppression coil.

The coal gangue identification method based on optical image has the advantages of simple equipment, easy realization, greenness and environmental protection, and it is an important way to realize intelligent coal gangue separation.There are two research ways. One way requiresextracting artificial features for recognition, which generally includes four steps: coal and gangue image data set collection, image preprocessing, feature extraction and selection, and coal and gangue recognition. The other way uses deep learning neural network to independently extractfeatures.This paper summarizes the different methods in the two research ways, and points out that the existing identification methods have shortcomings such as incomplete coal gangue image data set, incomplete feature understanding, and failure to give consideration to both efficiency and real-time performance. Suggestions for efficient coal gangue identification are put forward.

The energy input during the flotation conditioning will both promote the adsorption of the collector to the coal particle surface and the desorption of the collector from the surface of the particle, which is a key factor affecting the flotation performance. Taking flotation feed from Linhuan coal processing plant as the research object, the effects of the impeller stirring speed, stirring time and kerosene concentration on the collector adsorption rate, surface area utilization rate of coal particle and flotation rate in flotation process were investigated, respectively. Furthermore, the carbon emission utilization rate was also explored. With the increase of impeller stirring speed and stirring time, the adsorption rate of collector, surface area utilization rate of coal particle and flotation rate firstly increases and then decreases. Meanwhile, the adsorption rate of collector and flotation efficiency increases and then decreases with increasing of kerosene concentration in the studied scope. In addition, the surface area utilization rate of coal slurry gradually increases and then keeps constant.

Aiming at the casualty accidents caused by the driving control system of articulated double axle drive material transport vehicle in coal mine during use, take 5 tons transport vehicle as an example，the key technologies of articulated material transport vehicle such as cab layout design，diesel engine start and stop，variable speed control, steering control, brake control, dump control，control force determination，assistant driving system design and design of man machine-environment-system were expounded. The vehicle has been applied to the inclined shaft coal mines with different production capacity in Inner Mongolia, Shaanxi and Shanxi；When the vehicle is running at the normal speed of 30km/h，test the internal environment of the cab，the maximum temperature and noise in the test cab are 25 ℃ and 78 dB (A)；the maximum acceleration of pulse vibration is 19.6m/s2 ，lower than 31.44m/s2, no harm to human body；the maximum acceleration of random vibration is 0.312m/s2, less than 0.315m/s2?，the driver will not feel uncomfortable；the driver has no fatigue feeling after driving for 2 hours，never caused a safety accident. Design of driving control system for articulated double axle drive material transport vehicle in coal mine，need to research and development integrated electro-hydraulic control steering and electronic shift device with the coal safety certification；design explosion-proof instrument backlight display, driver fatigue alarm and air conditioning system；apply the roadway environment perception technology based on depth camera and millimeter wave radar，through the vehicle multi-sensor information collection, fusion, transmission，build 5G network vehicle mobile terminal and cloud data storage vehicle running state management platform, realize the information visualization interaction, automatic driving or unmanned control of vehicle；so as to further improve the convenience, comfort and safety of driving and handling.

Analyzed the main reasons for the slippage between the roller and the belt of the belt conveyor , and the tension detection device and its control system are researched and designed to realize the automatic adjustment of the driving force of the tail of the belt conveyor.The overall structure design of the automatic adjustment tail driving force device of the belt conveyor, the design check calculation of the tension detection device, and the design and working principle of its control system are introduced in detail.By applying the belt conveyor to automatically adjust the tail driving force device, it can ensure that the tail drive roller will not slip during any operation, and improve the service life of the roller and the belt.

Safety management system is an important means for an organization to maintain order and lead to safety objectives. How the safety management system produces effects？A theoretical model “institutional cognition- institutional behavior” was constructed based on cognitive and behavioral theory and the qualitive research of the individual's cognitive rules and characteristics of safety management system. It was proposed that: positive cognition of the system and background of institutional rules forms positive emotion, which makes individuals produce high level of willingness to comply with the system, and then increases endogenous compliance behavior, reduces exogenous compliance behavior, intentional violation behavior and retaliation damage behavior, and individual's cognition of institutional execution system moderates the predictive effect of institutional compliance willingness on institutional behavior choice.