Based on the actual situation of thick topsoil thick hard roof slab cutting and retaining roadway in 4307 working face of Guotun coal mine, this paper first simulates the evolution law of lateral overburden structure of thick topsoil thick hard roof slab with similar materials. With the different length of working face, it presents cantilever beam structures such as "L", "triangle" and similar "triangle". Because the thick topsoil is located in the bending subsidence zone above the fracture zone of overburden under 3 coal, the thick topsoil, as a given load, basically has little influence on the movement of overburden. The cantilever beam of thick hard roof slab has large thickness and long cantilever, which has a great impact on Retaining Roadway along the goaf. For the retaining roadway in this case, four key technologies of "full filling", "cut down", "asymmetric" support and "retaining" are proposed. These four key technologies are designed according to the actual situation of 4307 working face, and the determined design parameters are given. The field practice shows that the roadway reserved along the goaf behind the working face can be divided into three zones, the deformation gentle zone within 30m behind the working face, the deformation rapid zone of 30m-100m and the gradually stable zone of 100-240m. The deformation of solid side and bottom heave is large, and the deformation of roof and gangue side is small. After the 4307 track trench retaining roadway is stable, the section is reduced by about 22.1% compared with the original section. The reduced section of the retaining roadway can basically meet the requirements of mining reuse, and has achieved good application results.

Aiming at the complex hydrogeological conditions and the current situation of the underground normal drainage system of Lilou Coal Mine, in order to increase the mine's ability to resist flood disasters, design proposes a new mine disaster-resistant drainage system in the underground depot. Through theoretical calculations and program comparison, adopted the 'inclined lane connection + horizontal installation + floor layout' system arrangement, determined the selection of water pump and drain pipe, drew the pump characteristic curve. The disaster-resistant drainage system of Lilou Coal Mine is reasonably arranged, the equipment runs well after the project is implemented, The actual use effect meets the design requirements. The mine's ability to resist sudden flood disasters has been greatly improved, which has a good reference for the design and application of coal mine disaster-resistant drainage pump rooms.

Abstract：Indonesia is a very important coal producer in the world. Its coal output is 563 million tons in 2020, ranking third in the world. At present, almost all coal is mined in the open pit. After nearly 20 years of high strength mining, the coal resources with good surface mining conditions are greatly reduced, and the next step into deep mining is the future development direction. This is a very instructive attempt by a company in Indonesia to introduce Chinese technology for well mining. Through this project, it is found that the comparison and selection of development schemes is one of the key links in open-pit mining. The relative change of shallow surface in open-pit mines has great influence on the development design of industrial square and wellbore. Therefore, the whole coal mining development scheme needs ground and underground comprehensive consideration for comparison and selection. In this paper, the best scheme is selected through comparative study of schemes, which is not only beneficial to construction and cost reduction, but also in line with the transportation system left by open-pit mines to achieve the special design effect of open-pit to underground mining. There are not many similar projects in China, and it is hoped that this paper can provide reference for the future design scheme of open pit transfer mining

Based on the development trend of domestic coal mine intelligent substation, this paper discusses the design and application of intelligent substation technology in coal mine power supply engineering, puts forward the intelligent design scheme and system architecture of 110kV Substation in Wucaiwan No. 1 coal mine, and analyzes the relevant technologies and equipment selection required for the construction of intelligent substation in simple terms. This paper focuses on the relevant technologies and design solutions of "process layer" of 110kV intelligent substation in Wucaiwan No. 1 coal mine, summarizes the "three-layer and two network" communication network structure of substation, and summarizes the problems existing in the design and application of 110kV intelligent substation in coal mine. This paper has a certain reference significance for the engineering design of coal mine intelligent substation.

Based on practical engineering, the foundation design of factory buildings under complex karst geological conditions is studied and analyzed，Select different foundation types according to different geological conditions in site，According to the specification, the construction survey of rock-socketed piles is carried out one by one as the basis for the final hole of pile foundation，According to the on-site construction, various problems in the construction process are dealt with comprehensively considering various factors such as safety and reliability, engineering cost and construction convenience, so as to provide reference for similar projects.

In view of the large deformation and difficult to control of the gob roadway with large mining section, taking the 3402 working face of Hongqinghe coal mine as the research background, the calculation formula of the lateral basic roof breaking position of the gob is deduced by theoretical calculation. It is concluded that the lateral basic roof of 3402 working face is broken at 3 ~ 3.5m in the coal wall. FLAC3D simulation software is used to analyze the different coal pillar width and mining height of different working faces along the gob roadway, The results show that the peak bearing stress of coal pillar is relatively small when the coal pillar is less than or equal to 6m, the mining height of the working face increases, the stable bearing area in the coal pillar gradually shrinks and decreases, the roadway span increases, the range of low value area of partial stress of roof and floor expands, and the stability of roof decreases. According to the stress distribution characteristics of high section goaf roadway in deep large mining, The width of coal pillar is determined to be 6m. Through the implementation of support optimization scheme, good field effect is achieved.

The second substation at the level of -320m in Pingmei No.10 Mine is located in sandy mudstone. Affected by the behavior of rock pressure, the floor and two sides of the roadway had large deformations and the traditional support could not control the deformation efficiently. It was so necessary to repair the roadway with high-strength integrated bolt-grouting supporting technology. The deformation and damage characteristics of rock was analyzed by observing the fractured zone at various depths with borehole camera, and the reason of large deformation and difficulty of supporting was obtained. By numerical modelling, the primary support and the integrated bolt-grouting supporting were compared and analyzed with the result of that the integrated bolt-grouting supporting can control the roadway deformation effectually. The field application showed that the roadway would be stabilized in a short time with the integrated bolt-grouting supporting, and the deformation was controlled completely. This indicated that this method had obvious technical effects on controlling the deformation of soft rock roadway.

The roadway affected by the in-situ stress and mining stress will produce non-uniform deformation, and even cause roof accidents. The stability control of surrounding rock of mining roadway is the key to realize the safe and efficient production. In view of the serious deformation of 152106 working face track roadway under the influence of mining in Changling No. 1 Coal Mine, field monitoring, numerical simulation and other research methods are used to analyze the deformation characteristics of surrounding rock and the evolution law of plastic zone of mining roadway. The results show that under the influence of mining, the deformation of roadway surrounding rock is non-uniform. The deformation of roadway surrounding rock in front of the working face is smaller than that in the back of the working face, the deformation of roadway pillar side is larger than that in the coal wall side, the roof is separated and the floor heave near the pillar side are larger, and locally up to 400mm. The maximum principal stress, the ratio of principal stress and the range of plastic zone in front of the working face are all smaller than those behind the working face, plastic zone is elliptic in shape, and the displacement of surrounding rock is consistent with the range of plastic zone. Based on this, the reinforcement support scheme is put forward, namely the roof and the coal pillar is reinforced with anchor cable and two-ended cable respectively, and the single hydraulic prop is set up. The field test results show that the deformation of pillar wall of the track roadway is reduced by 65%, and the roadway floor heave is 260mm, so good engineering application effect has been obtained.

In order to explore the disturbance effect of roadway under near goaf on adjacent roof during repeated excavation, based on the mining environment of 22103 transportation roadway after coal mining in Hulusu Coal Mine 2-1, the disturbance relationship between unloading disturbance stress and adjacent roof in anchoring area was obtained by simulating multiple excavation progress of roadway. The results show that the disturbance stress of adjacent roof subjected to cyclic excavation shows a decreasing trend of waveform, and the disturbance area can be divided into near field disturbance area, middle field disturbance area and far field disturbance area according to the stress wave propagation characteristics. The relation between the disturbance stress and the distance of the roof can be regarded as "exponential function".The disturbed stress of the roof in the same position is less than that of the previous excavation, and the stress variation is almost the same each time. Field drilling peeping results show that the establishment of thick anchorage zone can greatly improve the integrity of roof strata.

In order to make the shaft sinking of coal mine with vertical shaft drilling method pass through the loose water bearing sand layer smoothly, combined with the geological characteristics of the loose water bearing sand layer in the central air shaft area of hokegai coal mine, a technical scheme of pile foundation curtain pre reinforcement treatment for the shaft is put forward. Through the implementation comparison of two pile foundation curtain reinforcement schemes of concrete bite pile and MJS jet grouting pile, it is determined that MJS jet grouting pile can be implemented smoothly under the geological conditions of loose water bearing sand layer. Through the establishment of finite element model and theoretical calculation, the reasonable construction parameters of MJS jet grouting curtain pile are determined. The results show that MJS rotary jet grouting curtain pile forms a curtain plus solid with qualified strength around the loose layer of the shaft. In the actual construction, it ensures that the shaft sinking of the coal mine shaft can smoothly pass through the loose water bearing sand layer. Its construction technology can provide a reference for the shaft construction of the coal mine shaft under similar conditions.

In order to control the curtain weak zone of multiple media and water-abundance aquifer, taking the curtain of Jurassic limestone aquifer in Zhuxianzhuang Coal Mine as the study area, the main reasons of the formation of weak zone of curtain and the identification method of weak zone are analyzed and studied. And the targeted control technology system for the weak zone of curtain based on drilling layout principles and targeted grouting technology is proposed. The results show that: (1) the main reasons for the development of weak zones are aquifer anisotropy, high-speed hydrodynamic conditions, groundwater impact or erosion and structure; (2) The reinforcement boreholes are arranged in the main runoff direction outside the curtain wall, 0.5 ~ 1 times the diffusion radius from the curtain, and the hole spacing and number of boreholes are determined by the slurry diffusion radius and the length of weak zone; (3) using the water pressure difference caused by underground drainage to form hydrodynamic conditions, the traditional reinforcement method is developed into targeted grouting reinforcement, which can grout the weak zone of curtain targeted. The research reduced the blindness of grouting, reduced the treatment cost, achieve the curtain closure of multiple media and water-abundance aquifer, and provide scientific guidance for the reinforcement of large-scale weak zone of curtain.

Taking the production process of fully mechanized coal mining face as the research object, aiming at the complex mechanism of the process, difficult to establish mathematical models and other problems, through data mining and deep learning technology, mining hidden laws in data, through intelligent modeling technology and multi-objective optimization technology, the process control parameters are simulated according to the comprehensive production index of the mine, the optimization model of process parameters is established, and the model is trained by massive historical data, in order to improve the production efficiency of working face, the optimized and reasonable process control parameters are selected, in order to reduce the production cost and energy consumption, improve the production efficiency to provide intelligent decision-making scheme, mining staff to provide auxiliary decision-making methods.

In the process of deep mining, with the advance of the working face under different mining conditions, the working face will experience different goaf boundary conditions. Based on the theory of overlying rock spatial structure, the overlying rock structure is called "O" type and "S" type under the condition of “one side goaf” and “two sides goaf” boundary condition, and the overlying rock structure is defined as "O-S" type in the process of their transformation. In order to study the spatial structure change of different overlying rocks in working face and its influence on rock burst, based on theoretical calculation, microseismic monitoring and on-line stress monitoring, the different overlying rock structure types formed during mining in 30202 working face of Muduchaideng Coal Mine are analyzed, and the characteristics of mine pressure appearance and the distribution of rock burst risk area under different overburden spatial structures are analyzed. The results show that under the condition of "one side goaf", the risk of impact in the mining process is small, in the process of changing the boundary conditions from "one side goaf" to "two sides goaf", the impact risk of the goaf side and its end coal in the adjacent working face is obviously higher than that in the previous stage, under the condition of “two sides goaf”, the distribution area of the influence range of inclined supporting pressure on the side of return air roadway is the risk area of rock burst. The research results can be used for reference for the analysis of stope pressure characteristics, roof control and roadway support design under different mining conditions.

Aiming at the potential safety problems existing in the application of explosion-proof diesel engine and explosion-proof battery monorail crane in high gassy mine and mine rescue, the structure of self-propelled pneumatic monorail crane with self-contained aerodynamic force, which can work independently without air duct, is studied. The multi parameter coupling optimization design method of the pneumatic actuator is proposed, and the optimization parameters of the pneumatic actuator are obtained, which effectively improves the output torque of the pneumatic actuator. The pneumatic pipeline, pneumatic valve, pressure reducing valve and other pneumatic equipment are used to construct the full pneumatic step-by-step pressure reducing driving air circuit. A safe, reliable, high transportation capacity, quiet, noiseless and environment-friendly underground air powered monorail crane has been developed. It has no high temperature, no spark, no combustion and no electrical control during underground operation. It is suitable for high gas mines to ensure safe production. The test results show that the performance of the pneumatic monorail crane has been effectively improved.

Gas drainage in goaf by surface L-shaped boreholes can not only reduce gas accumulation in upper corner of working face, but also facilitate the utilization of gas drainage. It has been experimentally applied in many mining areas in China, and the gas control effect and economic benefit are remarkable. However, there is a certain gap between the gas drainage effect of some surface L-shaped borehole and the expected drainage target. In order to improve the gas drainage effect of L-shaped boreholes, based on the "three zones" theory of stope rock movement and the gas migration law of working face, this paper comprehensively analyzes the influencing factors of L-type borehole pumping goaf gas, and studies the adaptability of L-type borehole and the optimization of horizontal section position of L-type borehole. The results show that the surface L-shaped borehole gas extraction technology is suitable for high gas working faces with high proportion of goaf emission, U-shaped ventilation and overhead mining face, and large amount of gas resources in goaf. The horizontal section of the L-shaped borehole should be arranged close to the side of the return air roadway of the working face. In the vertical direction, the starting point to the final hole point should have a certain downward dip angle, and the height of the starting point and the final hole point should be located in the upper and lower parts of the fracture zone respectively. In the horizontal direction, the horizontal section of the L-shaped borehole should be located in the fracture development area and close to the boundary of the return air side as far as possible. At the same time, the calculation methods of the vertical distance between the starting point of the horizontal section of the L-shaped borehole and the coal seam floor and the horizontal projection distance from the return air roadway are given respectively.

To accurately predict the basic top cycle pressure law of a fully mechanized mining face, the gray system theory is used to extract eight significant features that affect the cycle pressure of a fully mechanized mining face; the support vector machine (SVR) prediction model is overly dependent on subjectively selected parameters. Established a support vector machine (PSO-SVR) prediction model for particle swarm optimization parameter selection. The test results show that the mean square error of the PSO-SVM model during the period of compressive strength and step distance is reduced to 47.7% and 74.3% respectively, and the coefficient of determination is increased to 45.7% and 44.6% respectively. To highlight the superiority of the PSO-SVM algorithm model, the most widely used BP general neural network is established for comparison experiments. The results show that the particle swarm algorithm has a significant effect on the performance optimization of the standard support vector machine model, and has obvious advantages over the ordinary BP neural network. Therefore, PSO-SVM has high accuracy and strong generalization for the nonlinear coupling prediction affected by multiple factors. This study can effectively predict the periodic pressure law to provide a reference value for safe and efficient mining in a fully mechanized mining face.

Abstract: To predict the blasting effect of rock roadway more accurately, to improve blasting efficiency and reduce production costs, the blasting data in the existing rock blasting database is used. Select 6 factors of total charge, roadway cross-sectional area, blast hole depth, cut eye charge, auxiliary eye charge, and peripheral eye charge as input, and construct a grid search Cross Validation-Support Vector Machine (Grid Search CV-SVM) regression prediction model. Use average absolute error and correlation coefficient as evaluation indicators to predict the unit consumption of explosives. SVM uses radial basis kernel function (Rbf), polynomial kernel function (Poly), and linear kernel function (Linear) to compare three kernel functions with each other, and introduces Random Forest (Random Forest) regression algorithm as the control group. The results show that the SVR-Rbf group performed the best. The correlation coefficients in the database and the actual case prediction of the Gubei coal mine were both about 0.95, and the average absolute error was at least about twice as small as the other groups. The performance of the Random Forest prediction group is not as good as the three SVM prediction groups，and the optimal model is applied to the prediction of the unit consumption of explosives for rock tunnel blasting in Gubei Mine, and the effect is good. The established Grid Search CV-SVM prediction model is an excellent method to predict the effect of rock roadway blasting.

In view of the serious dust pollution in the first-level crushing station of open-pit coal mines, in order to solve the problems of high investment, large energy consumption and poor dust suppression effect in the existing dust control technology, a micro-power induced dust suppression hood for first-level crushing station hopper of open-pit mine was developed based on micro-power induced dust suppression mechanism, and a field application test was conducted. This dust suppression hood has simple structure, is composed of a cover body, a first level dust layer, a second level dust layer and a vibration device. Thus, the air discharged from the hood has passed through two times of dust reduction, the dust concentration has been significantly reduced. It has a good prospect of popularization and application by vigorously improving the production environment.

Slicing mining is one of the main mining methods for thick coal mining. The deformation of the surrounding rock of the roadway affected by mining is a common factor in slicing mining. Ensuring the stability of the surrounding rock is a safety guarantee for the daily production of coal mines. This paper takes the Laogongyingzi Mine as an example. On the first layer, there is a 22m-wide coal pillar between the first mining face and the continuous face. Through theoretical analysis and numerical simulation, the range of the continuous face affected by mining is determined, and the support is optimized. The protection plan increases the stability of the surrounding rock of the roadway, and reduces the work of expanding and pulling the bottom of the connecting surface. The research shows that under the 22m wide coal pillar, the influence range of the first mining face on the continuous face is 50m from the leading face to 30m from the lagging face; the optimization plan is determined according to the observation of the numerical simulation effect, and the area with concentrated plastic failure set up reinforced anchor cables to strengthen support; through field application, the effectiveness of the optimization plan was determined.

In view of the large amount of deep laneway deformation and support difficulties affected by multiple mining, the research object of Zhaozhuang Coal Mine 33092 Lane, through on-site research, theoretical analysis, numerical simulation and other ways to analyze the deformation and destruction pattern of deep coal lane surrounding rock affected by repeated mining, obtained the characteristics of deep lane surrounding rock bias stress distribution and the evolution law of plastic area. The results show that the "8" type distribution of the bias stress S1 and plastic area of 33092 lane-surrounding rock are skewed, which belongs to the obvious asymmetric destruction, and the form of on-site roadway destruction is basically the same as the theoretical analysis and numerical simulation results Based on the asymmetric distribution pattern of bias stress and plastic area, the asymmetrical support improvement scheme of 33092 lane is proposed and the industrial test is put into practice immediately, and the test results reveal that the scheme can maintain the stability of the roadway surrounding rock and ensure the safe use of the roadway during the service period.

In order to explore the influencing factors of rheological parameters of gangue paste like slurry during pipeline transportation, taking the gangue paste like filling slurry of Gonggeyingzi mine as the engineering background, the rheological parameters of gangue paste like filling slurry under different concentration and gangue particle size were measured by CRT rheometer. The stress of gangue particles in paste like slurry is analyzed by using hydrodynamics and particle transportation hydraulics. The slurry flow state and particle trajectory under different flow velocity, gangue particle size and slurry concentration were simulated and verified by FLUENT software. The results show that the particle size and concentration of gangue paste slurry affect the plastic viscosity and initial shear stress of the slurry, and then affect the critical flow rate of pipeline transportation. Specifically, in the process of pipe transportation, gangue particles with particle sizes of 15mm and 20mm are more likely to sink than those of 5mm and 10mm. When slurry concentration reaches 76%, the increase of initial shear stress of slurry increases sharply. As slurry concentration increases, gangue particles are less likely to settle in the process of pipe transportation. This study has certain reference significance for setting parameters of gangue paste like filling slurry and engineering practice.

In order to study the effect of the flat baffle inlet distortion on the internal unsteady flow field of the fan, SST k-ω turbulence model was used to simulate the three-dimensional flow in the whole flow passage, including the intake air duct, of a mining contra-rotating main fan. The internal flow field characteristics are analyzed in detail. The results shows that compared with the undistorted intake type, the flat baffle inlet distortion deteriorates the flow field in the intake air passage upstream, resulting in the decrease of the relative flow angle of the impeller inlet and blocking the blade passage in the distortion zone, and the rotating stall of the contra-rotating fan will occur in serious cases. The vortex pair located under the lower passage caused by the flat baffle inlet distortion leads to a serious difference in the static pressure load distribution of the two blades in the same distortion area, which seriously affects the working state of the impeller and blades. Along the span of the entire blade, the flat baffle inlet distortion has the most serious impact on the blade tip area.

The image classification of coal and gangue is the key to realize the automatic separation of coal and gangue images. To improve the accuracy and stability of coal gangue automatic separation model, a hybrid feature selection and classification method based on Relief, MRMR algorithm and SVM classifier is proposed in this paper. A total of 26 features of the color and texture of coal gangue image are used to study its classification. LBP local features and GLCM global features are combined to improve the accuracy of coal-gangue classification. After an optimal feature subset is selected, PSO and SVM are used to construct PSO-SVM optimal parameter model for coal gangue classification. The results show that this method can eliminate more redundant features and improve the efficiency of coal-gangue classification. The average classification accuracy of the model is 96.12% and 94.17% respectively on two different data sets, which proves the effectiveness of the method and the stability of the model.

The industrial and mining activities have an import impact on regional water environment and water security. It is of great significance for maintain the development of regional ecosystem and human development to deepen the research on the chemical composition and influencing factors of surface water and groundwater in the mining areas. Taking the surface water and groundwater in the Shendong mining area as the research object, the Piper diagrams, Gibbs, Na-normalized molar ratios, WQI method, and TH-TDS method were used to analyze the differences and characteristics of chemical composition and controlling factors of surface water and groundwater in this area, and evaluated the suitability for drinking. The results show that both groundwater and groundwater in the Shendong mining area were weakly alkaline, and the pH value of surface water was larger than that of groundwater as a whole. The EC value of groundwater was higher than that of surface water. The TDS value of groundwater was obviously higher than that of surface water. The TH value of groundwater was larger than that of surface water and varied in a wider range. Secondly, the dominant anions of surface water and groundwater were HCO3- and Na+, and the water types m were Cl-SO4-Ca-Mg. The chemical composition of surface water and groundwater in the Shendong mining area was mainly related to the weathering of silicate rock and evaporative rock, while carbonate weathering also played a certain role. Meanwhile, some points fell outside the triangle, which may be influenced by other factors. Finally, the suitability evaluation of surface water and groundwater quality in the study area showed that the groundwater quality in the study area was better than that of surface water on the whole, but attention should be paid to proper treatment when using the mine water as drinking water. This study can not only provide scientific basis for the management of surface water and groundwater in the Shendong mining area, but also provide scientific reference for other similar areas.

Abstract: The current domestic developments in large diameter deep shaft construction formation, the well drilling rig drilling method as a kind of mechanized shaft sinking method, by means of directional drilling technology, can achieve the goal of safety fast high precision construction of large diameter deep well .Firstly, directional drill is used to drill the pilot hole and control the borehole trajectory, well then use the drill hole enlarge pilot hole Due to the deviation of the pilot hole, the total Angle change rate of the pilot hole track will have a great influence on the sweep of the large diameter drilling tool. Through the theoretical analysis of bending stress, the relationship between the total Angle change rate of the pilot hole track and the large diameter reverse drilling tool is established. By analyzing the measured deviation data of the pilot hole, the trajectory model of the pilot hole is established. Through the industrial test of directional reverse well drilling, the influence degree of the total Angle change rate of the guide hole on the sweeping of the large diameter reverse well drilling tool is studied. The results show that the method can accurately predict the state of the drilling tool during the sweeping, which provides theoretical and technical support for ensuring the safe and smooth sweeping of the drilling tool during the construction of the large diameter deep reverse well drilling method.

According to the working characteristics of underground road-header, the walking position and posture deviation model of a road-header is established. Taking the caterpillar moving line speed and turning angle speed as control inputs, the control law of path tracking scheduling is designed and simplified by using principle of Lyapunov and backstepping method. The BP neural network is used to update the dynamic optimization of the key factors in the control law to compensate the tracking deviation of the body position and posture which is from the designed track in real time. The simulation results show that the proposed working control model of road-header based on BP network is simple and easy to implement. The position and posture deviation of the road-header can converge to zero within a limited tracking step and the angular speed adjustment process is stable. This proves that the tracking effect under the control of this model is good and has great potential for application.

In view of 10 kinds of important electromechanical transportation equipment in coal mines, such as vertical shaft hoisting system, which are of great significance and prone to mass death and injury accidents, through a comprehensive investigation across the country, the current situation of technical development and safety management is mastered. Combined with the statistics of MA Certification management data, the problems existing in the safety management of important electromechanical transportation equipment are studied. Combined with the comprehensive analysis of electromechanical and transportation accidents in coal mines in China in the past 8 years, the countermeasures to further improve the safety guarantee level of important electromechanical transportation equipment are put forward, which provides useful reference for coal mining enterprises, equipment manufacturing enterprises and safety supervision and supervision institutions.

According to the Hertz contact theory, the internal mechanical analysis of the ball bearing was carried out, and the lubrication characteristics of the bearing were considered according to the elastic fluid lubrication theory. Based on ADMAS, the fault bearing models with inner ring fault dimensions of 0.007 inch, 0.014 inch and 0.021 inch were established, and the vibration data of inner ring fault were simulated. The results show that the simulated characteristic frequencies of different fault sizes are close to the calculated and experimental values, and the maximum relative error is 3.46%. The feasibility of using virtual prototype technology to establish bearing typical fault database is verified.

The principle of interference bed and the best range of feed size are introduced. The analysis shows that increasing the bed density and decreasing the rising water flow rate can enhance the function of density separation, and then improve the separation effect of interference bed.Adding heavy medium into the interference bed can increase the bed density, significantly improve the clean coal index, and greatly improve the separation effect.

In order to solve the contradiction between the damage caused by shallow-buried high-intensity mining and ecological protection, based on the geological mining conditions and ecological background characteristics of Shendong mining area, the damage characteristics of high-intensity mining are summarized. Shendong mining area adopts the technology of large working face rapid advancing to reduce the non-uniform settlement area, grouting to reduce the settlement of working face at the initial stage of mining, constructing underground reservoir to keep water and ecological utilization, burying surface cracks to keep water and soil moisture, improving the stress resistance of plant inoculated microorganisms, domesticating and screening suitable plants, which effectively reduces the ecological damage caused by coal mining and achieves good results. Remote sensing monitoring shows that the vegetation coverage of Shendong mining area is about 50% in the initial stage of technology application from 2011 to 2015, which is in the middle and high vegetation coverage level. In 2018, the vegetation coverage is 62.4%, reaching the high coverage level. Combined with mining practice and theoretical research, the whole process control technology is put forward, which starts from the design of mining source, regulates the transmission process, and repairs the end of the mining damage.

In the process of coal mine excavation, the safety detection is an important link in production after blasting oper-ation. Aiming at the traditional safety evaluation method of safety officers using portable detection equipment and open hole experience judgment after excavation blasting, a robot technology for blasting quality evaluation is proposed in this paper. The realization method of crawler robot base in the environment of heading face is studied. The robot scans the front end of heading work by carrying geological radar to identify the stability of roof and surrounding rock. The three-dimensional laser scanning technology for underground roadway is studied. After panoramic scanning of underground roadway, the data is transmitted to the management and control platform system, Process and analyze the collected scanning data, generate the three-dimensional solid model of under-ground roadway, compare the obtained solid model with the design and construction drawings, and complete the acceptance of roadway construction quality; At the same time, the changes of solid model in multiple time periods are compared to assist in the analysis of roadway surrounding rock stability. Through the autonomous inspection of the robot, the rapid evaluation of roadway safety and quality in the initial stage of blasting in the heading face is realized, the operators in dangerous environment are reduced, and the intelligent level of the heading face is improved.

In order to improve the material transportation efficiency of Dongjiang coal industry in Shanxi Province and reduce the potential safety hazard，it is determined that the container with materials is fixed on the rail flat car，is hauled and transported to the loading chamber by the mine hoist, the container is lifted by crane and placed and fixed in the cargo compartment of trackless rubber tyred vehicle，the materials are transported to the designated place by trackless rubber tyred vehicle in the drift. About 80t of materials are required per day in coal mine，proposed the load of the trackless rubber tyred vehicle is 5t，the maximum speed of full load operation is 40km/h，two vehicles are equipped for continuous transportation. The trackless rubber tyred vehicles are required to meet and avoid passing in the auxiliary transportation, the width of the whole vehicle shall not be greater than 1980mm，the maximum dump height cannot be greater than 3200mm, therefore the whole vehicle is designed to be articulated, the front car body is designed with power transmission system and driving control device, design and layout of working device for rear car body. The design of vehicle power transmission system、frame and suspension design、steering system design、dump truck and container design and other technical points is described；the maximum traction force for full load test of the whole vehicle is 90kN on a horizontal dry road，the maximum speed is 35km/h；lengthen the wheelbase by 600mm，the maximum speed of all wheel drive and front wheel drive is 32km/h. Practice has shown that two 5t rubber-tired trucks transport an average of 16 times a day, it takes about one hour for a single vehicle to change the load, unload and arrive and depart, have been used for 12 months with stable performance.