ABSTRACT：During 14th Five-Year, due to new uncertainty and instability to the development of the coal industry caused by the changes of the global economic and energy, the opportunity provided by the new generation of information technology needs to be seized. This paper will focus on the key field, research the application in the development of the coal industry and the significance in the the intellectualized development of the coal industry of the new generation of information technology which is represented by “artificial intelligence”, “big data”, “blockchain”. Meanwhile, this paper will research the effect of the new infrastructure in the intellectualized development of the coal industry.

In order to determine reasonable lag safety distance of shallow buried 1-1 coal and 2-2 coal in Longde mine, CT detection technology and borehole stress monitoring system are used to carry out the measured study on the simultaneous mining stress distribution of upper and lower coal seams. Study concludes that CT detection determines that the leading mining stress range of 2-2 coal seam for fully mechanized large cutting height face is 59.5m, and roof of 1-1 coal seam began to collapse is about 47.5m behind the goaf, and affect the stress distribution of 2-2 coal seam below. The borehole stress gauge has determined that the maximum distance affected by the leading stress on 2-2 coal seam is 50.7m, the stress peak is 6m ahead of working face, and stress concentration coefficient is 1.23, but working face of 2-2 coal seam are not affected by the adjacent working face with 20m coal pillar and the overlying coal mining with an interval of 54m roof layer thickness. Three calculation methods are used to determine that the reasonable lag distance of upper and lower coal seams co-mining in Longde mine is 138.4m. The numerical simulation study shows that the tensile stress runs through the whole interval within 50m, thus verifying the safety of the coordinated safe interval of 138.4m between upper and lower coal seams in Longde coal mine.

Aiming at the concepts of precise mining and reducing waste of resources of Russian coal mines, a combination of on-site investigation and industrial design was used to conduct research on equipment selection for the fully mechanized coal mining face of the Russia Nanfang mine,which under the condition that the coal seam fluctuation frequently, tends to fluctuate, and the dip angle changes greatly. The results show that the scraper head and tail "short chute" are used to reduce the vertical bending curvature radius between the chute, speed up the vertical bending rate, shorten the length of the bending section,and better achieve the cross side unloading method of inclined working surfaces and it tends to cause problems such as the bottom of the head and the top of the tail being too large due to the large curvature radius of the vertical bending of the conveyor head and tail. The results show that the scraper head and tail "short chute" are used to reduce the vertical bending curvature radius between the chute, speed up the vertical bending rate, shorten the length of the bending section, and better achieve the cross side unloading method of inclined working surfaces and solved the problems of such as broken head and excessive tail break due to the large curvature radius of the vertical bending of the conveyor head and tail.Utilizing the technology of the attitude correction cylinder between the hydraulic support and the central groove to accurately control the tilting angle and supporting relationship, to ensure that the tilting angle of the central groove can be accurately controlled within the range of ± 5 °,which effectively prevent the problems of "slipping" and "bottoming" of the conveyor caused by more frequent undulations. It improves the work efficiency and reduces the waste rate.

Research of village coal mining under pressure is to solve the problem that in Datong a large number coal resources under buildings, railways and water cannot be mined for a long time. A lot of high-quality coal resources are lost. In the paper, it is considered that strip mining is the most suitable method for coal pillar mining under Datong Coal Mine Group, through the comparison of various technical approaches of coal pillar mining in villages. Based on the analysis of 11# coal, thickness, dip angle, burial depth, etc. in Xinzhouyao Mine, the maximum subsidence and deformation value are calculated, and the most reasonable mining width and reserve width are selected. According to the analysis of the lithology in this area and the relationship of rock displacement parameters between strip mining and longwall fully mechanized mining, the final surface subsidence and deformation values are calculated, and the impact of the surface subsidence on the housing are expected. Through this study, we hope to provide theoretical basis for the coal mining under pressure in Datong Coal Mine group.

Aiming at the current situation of low transportation efficiency and poor safety of the orbital auxiliary transportation system of large inclined angle inclined shaft coal mine, the Shanxi Tiandi Wangpo Coal Industry Inclined Coal Mine with a dip angle 23° was studied. The transportation, material transportation and fully mechanized equipment transportation were carried out by means of overhead passenger, rail and trackless transportation. The process of entering and exiting the rubber wheel, the rail and railless reloading, the design features of the main models and the vehicle configuration are discussed. The results show that after the trackless rubber tire car, the time from the downhole loading station to the working surface of Wangpo coal industry personnel is shortened from 60min to 20min; the daily transportation volume of materials increased from 120t to 480t; the time for moving the fully mechanized mining face to be moved from 90d to 30d; the auxiliary facilities in the rail transportation system are avoided, and the mechanical safety hazard is reduced. The track-assisted transportation mode of the large inclined angle inclined shaft coal mine will be changed and designed. According to the materials and equipment types of each mine, the suitable trackless rubber wheel vehicles will be selected to form a unique transportation process.

In view of the concept confusion in the performance test method of coal mine ventilating fan, this paper adopts the method of combining theory and practice. Firstly, the relationship between the relative static pressure、relative total pressure at the entrance of ventilator and the total resistance of mine shaft ventilation is analyzed in theory. And it points out the error prone place when reading the data in the field performance test. Then it analyzes the misunderstanding of static pressure of device and total pressure of device for a long time, and points out the seriousness of the problem through a real field performance test case recently. Finally, it puts forward its own suggestions to relevant units and practitioners.

In order to solve the problems that data can not be unified access, the response is not timely and low degree of intelligence in monitoring system for central substation of coal mine, the distributed intelligent acquisition and analysis system has been developed for the central substation in the underground coal mine. Based on the main processors Exynos4412, NVIDIA Jetson TX2 processor and FPGA processor, the infrared imaging sensor circuit, vibration signal acquisition circuit, current signal acquisition circuit and TEV signal acquisition circuit etc. are designed. The application software of intelligent acquisition and analysis terminal is realized based on downhole loop network and Linux system coding. After testing, the system developed in this paper has an average packet loss rate of 0.114% and an average response time of 1.685 seconds.The intelligent acquisition and analysis terminal developed in this paper can provide fault diagnosis service and improve the intelligent level of coal mine.

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In order to ensure the speed of coal seam exposure and improve the efficiency of stripping operation, the single bucket truck technology of throwing blasting was used during the maintenance of the dragline in Heidaigou open pit coal mine. Based on the analysis of the technological process and technical characteristics of the single bucket truck technology of stripping loose blasting, the single bucket truck technology of throwing blasting and the pull bucket shovel technology of throwing blasting, this paper compares the advantages, disadvantages and applicable conditions of the three stripping technologies, and takes the actual project of Heidaigou open pit coal mine as an example, studies and proves that the single bucket truck technology of throwing blasting can improve the stripping efficiency Ensure the coal seam exposure speed, shorten the truck distance, reduce investment and other advantages. The technology is worth popularizing in the open pit with suitable conditions and has a bright future.

The influence characteristics of soil environment in the coal mining area are analyzed. Take Baijiahaizi coal mining for example, main problems of soil environment are analyzed, the influence of coal mining on soil environment are predicted, and the prevention and control countermeasures are put forward. The paper can provide technical support for soil environmental impact assessment and follow-up monitoring in similar mining areas in China.

Abstract：After the outbreak of novel coronavirus pneumonia in 2020，There is an urgent need to rebuild the existing buildings，Make it a shelter hospital for the prevention and control of the epidemic。This paper takes Hongshan gymnasium, one of the first three shelter hospitals in Wuhan, as an example，From the construction principle, design interpretation, matters needing attention and promotion strategy，through theoretical analysis，data processing and other methods were analyzed for the transformation of the shelter hospital，the design process and results of shelter hospital reconstruction project are summarized，give full play to the value of public buildings in urban disaster prevention，It provides a new way to realize the conversion between peacetime and wartime。

To reduce the amount of small roadway excavation and relieve the tension of mining replacement, one or two roadways in a working face with multi-roadway preparation will be remained for utilizing in the next working face. Under the influence of strong mining, the coal pillar is suspended by the side roof of the goaf, which is difficult to collapse, resulting in large variable of the reserved roadway and difficult to control. In order to solve this problem, the hydraulic fracturing and pressure relief technology is put forward, and the seepage stress damage coupling mathematical model of water movement, rock deformation and failure in rock stratum is constructed. Based on the research background of the working face Ⅲ 4321 in Changping Coal Mine, the whole process of hydraulic fracturing and roof cutting and pressure relief is numerically simulated. The elastic modulus, damage field and stress field distribution of coal seam in hydraulic fracturing and mining are studied, and the roof cutting and pressure relief effect of hydraulic fracturing is numerically analyzed. According to this, the field application of hydraulic fracturing and roof cutting and pressure relief in the dynamic pressure roadway is carried out. The practice shows that after the hydraulic fracturing measures are taken, the maximum displacement of the two sides and the displacement of the roof and floor in the mining process of Ⅲ 43212 roadway are greatly reduced. The deformation control effect of the roadway surrounding rock is good.

Yushuquan Coal Mine has a shallow coal seam and simple geological conditions. It is suitable to use gob-side entry retaining technology. In order to improve the recovery rate of coal resources and reduce the number of heading roadways, Yushuquan Coal Mine adopts constant resistance large deformation anchor cable and steel belt reinforcement at 1014 working face, then carries out deep hole blasting technology to pre-crack the roof and cut the roadway along the gob-side. After blasting, it adopts temporary and permanent support to reinforce the supporting roof, and finally uses U-shaped steel to retain gangue, which has achieved good supporting effect.

Based on the problem that the surrounding rock of deep high stress and super large section chamber is easily unstable，taking the equipment replacement chamber of Hongqinghe coal mine as the engineering background, with the numerical simulation method , the stress distribution characteristics and deformation law of the surrounding rock of the super-large cross-section chamber under low-disturbance driving conditions was analyzed. Under high stress conditions, the plastic zone of the super-large cross-section chamber becomes significantly larger; The wall and floor of the chamber are more prone to instability. Based on this, high pretensioned stress and intensive bolting system is proposed to control the surrounding rock of the high-stress ultra-large section chamber. The bottom plate anchor cable is cement grouted to achieve full-length prestressed anchoring. Field practice shows that the chamber is very stable and the amount of deformation is controlled within 30mm.

In the process of mine production, the accuracy of the location of old goafs and gob areas have always been the key issue affecting the mining design, construction and the safety of production. This article takes unknown area of underground yard of Shanxi Coal Transportation and Marketing Group Tuoxin Coal Industry Co., Ltd as research object; and using seismic exploration technology of reflected trough wave to detect the goafs which are defined in <Geological Report>. The final imaging results of the research effectively delineated the distribution of goafs and gob areas which is verified by drilling results. The research indicates that the channel wave seismic exploration clearly delineates the distribution of suspect goafs and gob areas. Reflected trough wave technology provides technology support and safety guarantee for the design of underground depot, central substation, pump house and water tank during the process of mine’s construction, which shortened the construction period resulting effective reduction in investment requirement.

Abstract:During the construction of large-diameter silo sliding form, due to the large load on the top of the silo, the construction of the silo roof structure needs to be poured several times. The sliding formwork platform needs to be set up with a temporary vertical center frame and diagonal stays to improve its carrying capacity. To solve the problems caused by such measures, such as high cost and long construction period, this paper proposes a new modular rigid sliding mode platform. The platform system is simple in form and clear in force transmission path. It not only gets rid of the vertical center frame, but also solves it. The low rigidity of the traditional rigid sliding mode platform causes the platform to be idle, which shortens the construction period and saves costs. The finite element software SAP2000 and ABAQUS are used to check the bearing capacity of the whole and the most unfavorable splicing nodes of different diameter rigid sliding mode platforms. The results show that the modular rigid sliding mode platform meets the bearing capacity requirements.

In view of the problem of ground pressure control in the final mining stage of super long and large mining height fully mechanized mining face, this paper adopts the methods of theoretical analysis, numerical simulation and field test to determine the corresponding technical scheme of ground pressure regulation by studying the distribution law of surrounding rock stress and the characteristics of ground pressure manifestation in the final mining through stage of 112201 working face in xiaobaodang coal mine. It can effectively control the periodic weighting step distance of the working face in the final mining stage, maintain the stability of the roof strata, and realize the smooth laying of the flexible plastic net (15m wide×360m long) in the working face. The results show that: during the last mining period, the stress of the surrounding rock in the withdrawal channel will be transferred from the mining side to the pillar side. Strengthening the support strength of the surrounding rock of the withdrawal channel can ensure the stability of the withdrawal channel.By adjusting the mining speed of working face, the position of periodic weighting can be changed and the duration of weighting can be reduced. It can achieve the smooth hanging and connection of the working face, which has reference significance for the smooth withdrawal of similar working face equipment.

【 Abstract 】:Aiming at the problem of broken roof and poor stability of fully mechanized mining face, a new idea of roof top control technology was put forward. The roof reinforcement was carried out in front of the coal wall in the roof of fully mechanized mining face, and Ma Lisan chemical grouting agent was strengthened. The roof control technology scheme combining Rock's foam filling and the three is applied in the field at the Xiaoji Khan 11217 fully mechanized mining face. The results show that the technical innovation scheme effectively controls the roof of the fully mechanized mining face, and the stability of the surrounding rock of the working face is enhanced, which realizes the safe and efficient recovery of the fully mechanized mining face.

Aiming at the problems of small extraction radius and low extraction efficiency in the gas gas extraction of deep-permeability coal seams in deep mine, taking the Shoushan No. 1 coal mine of Pingdingshan mine areas test sites, Experimental research on permeability improving technology of tree-type through layer borehole. The test used a self-propelled hydraulic jet tree drilling process.A total of 34 sets of tree-type through layer borehole were constructed in low gas extraction lane which under the seam. 7 per group, total 238 boreholes. The results showed that,compared with hydraulic punching borehole, the application of tree-type through layer borehole in deep low-permeability coal seams, significant increase in extraction influence radius. The average gas drainage concentration increased by 1.30 ~ 1.80 times. And the high-concentration extraction cycle is prolonged. The average daily extraction volume of a single hole is 3.47 ~ 5.30m3 /d. Compared with hydraulic punching and drilling, it is 1.58~3.66 times. The effect of the application of tree-type through layer borehole to the pre-extraction of the cross-strip strip in the deep mine face is obvious. Provided permeability improving technology reserves for gas drainage in deep low-permeability coal seams of pingdingshan mining area.

Since mine load center has such particularities as complex operating environment, intense vibration and frequent operation, the short-circuit breaking capacity of the HV vacuum switch of such load center was analyzed in detail in this paper from grid system, circuit breaker contacts, arc extinguish chamber and opening mechanism, etc. The following conclusion was acquired: the actual breaking capacity of the HV vacuum switch is less than the rated breaking capacity and will gradually decrease over time. It was proposed from the perspective of underground power supply and distribution design that attention should be paid to the scientific selection of new equipment and that the equipment in use should be supplemented by optimizing the fixed value, improving the test, strengthening the maintenance, among other measures. This proposal provides a theoretical guidance for power supply and distribution design for underground coal mine, especially for the selection of vacuum circuit breakers and the verification of breaking capacity.

In view of the engineering problems of rockburst prevention and control in a kilometer deep well, taking the first mining face of Shuanghe coal mine as the engineering background, through theoretical research and field measurement and analysis, the law of the first mining face's mine pressure under the current geological and mining technology conditions is explored. The conclusions are as follows: (1) based on the analysis of load three zone theory and microseismic measured data, the thickness of immediate loading zone in the first mining face is 23.8-37.2m above the coal seam, the thickness of delayed loading zone is 60-73.7m above the coal seam, and the static loading zone is 73.7m above the coal seam to the surface; (2) the influence range of advance disturbance in the first mining face revealed by microseismic is 120m, and the advance influence range revealed by borehole stress monitoring is 115-120m It is 92-101m. (3) The microseismic monitoring revealed that the fracture angle of the strata is about 52 ° in strike and 60 ° in dip.

Abstract：As the basic parameter of mine, the development height of water-conducting fracture zone in roof of coal seam plays an important role in mine disaster prevention. Based on the crack evolution law of different stages in the stress-strain curve and acoustic emission characteristics of rock, the feasibility of microseismic monitoring technology to determine the height of water-conducting fracture zone was analyzed. A microseismic system was built around the 1604 caving top coal face of Guhanshan coal mine, and the results show that the damage degree of the direct roof and the old roof of the working face is much higher than that of the overlying strata. The continuous failure area of the roof is a "blunt triangle" and the development height of water-conducting fracture zone is about 75 m. The numerical simulation results show that the height of roof water-conducting fracture zone in the working face 1604 is about 71 m. The results based on microseismic monitoring analysis are verified, which provides a new method for measuring the height of roof water-conducting fracture zone in coal mine.

Aiming at the separation phenomena in the anchorage layer of mining roadway, based on the research results of load transfer law, interface shear slip model and the distribution of axial force and shear stress on both sides of the anchorage layer, the load-bearing characteristics of resin bolts with different anchoring modes before and after the separation occurs at any place in the anchorage are studied. The results show that the load-bearing characteristics of the bolts are obviously uneven under the influence of the anchorage mode, the pre-tightening force of the bolts and the separation layer of the bolts. Before the separation occurs, although the peak values of interface shear stress and ultimate bearing capacity of end anchorage, lengthened anchorage and full-length anchorage are the same, the distribution patterns of interface shear stress and ultimate bearing capacity of anchor are different. When the separation occurs, not only the distribution pattern of the interface shear stress and the ultimate bearing capacity of the bolt has changed obviously, but also the peak values of the interface shear stress and the ultimate bearing capacity of the bolt are different. The bearing characteristics of full-length pre-stressed anchor bolt are better than those of end, lengthened anchor and full-length anchor bolt. It has better restraint and restraint effect on deformation and separation of surrounding rock. Full-length pre-stressed anchor bolt should be preferred in mining roadway prone to separation of surrounding rock.

In view of the fact that under special geological conditions, the effect of changing mining height and increasing support resistance is not obvious in maintaining the stability of coal wall in large mining height working face, the stability of coal wall is studied from the angle of improving coal strength. Based on Mohr-Coulomb criterion, the stability of coal wall in high mining face is theoretically analyzed, and the relationship between coal strength and stress of coal wall is revealed. The failure law of coal wall stability under different coal strength is summarized by numerical simulation. Finally, the deformation and failure of coal wall under different coal strength are analyzed intuitively through similar simulation experiments. The results show that both the tensile and shear failure of coal wall are related to the physical and mechanical properties of coal body. With the increase of coal body strength, the stability of coal wall is higher, and the increase of coal body strength has a significant impact on the stability of coal wall. In similar simulation experiments, when cohesion increases by 1 MPa, the critical pressure of coal wall failure increases by 1.64 MPa, and the failure height decreases. 1.7m, the damage depth is reduced by 0.7m.

Abstract：Aiming at the occurrence conditions of extra-thick and soft-top coal, the reasonable working face parameters, processes and equipment were determined through numerical simulation and theoretical analysis, and the automatic design of the working face was carried out. The results show that: the average coal thickness is 11m, and the soft coal seam adopts the mining height of 3.5m, one mining and one caving, and multiple rounds of interval caving can achieve optimal coal wall stability control and top coal recovery rate; reasonable equipment selection can increase the special thickness Reliability of roof control and transportation of soft coal fully mechanized sublevel caving; integrated supporting systems such as automatic coal placement system based on memory + manual mode, comprehensive monitoring and support system for support quality of hydraulic support, intelligent spray dust reduction system, etc. Efficient, safe and efficient automated production.

To provide security for the intelligent inspection personnel of fully mechanized working face, this paper puts forward a set of intelligent safety locking and unlocking strategy method of fully mechanized working face, using high precision positioning system implementation personnel identification, personnel positioning system, the host of the electro-hydraulic control system, support controller to realize harmony and logical judgment, in combination with the practical movement speed dynamic matching of inspection personnel, realize the personnel positioning system, intelligent hydraulic support electro-hydraulic control system of fully mechanized working face, inspection personnel security coordination. According to the activity of the inspectors, the automatic action area of the electro-hydraulic control system in the fully mechanized mining face is divided, and two situations that may cause action conflicts and their solutions are analyzed. In this paper, the system locking strategy, active unlocking strategy, passive unlocking strategy and their implementation methods are presented, and the personnel dynamic matching strategy is presented. Through field testing in Wangjialing coal mine 12309 face, hydraulic support electro-hydraulic control system response can be obtained at normal movement, through the system to unlock the measured response time showed that stent actual unlock time unlock longer than theory about 5 to 7 s, with the personnel positioning system signal intensity and stent controller delay unlock Settings. The research can provide technical reference for the safety guarantee of intelligent fully mechanized mining face.

To solve the reuse of increasing number of abandoned coal mine, five principles and requirements of taking advantage of underground space of abandoned coal mine have been proposed based on the technical route of compressed air energy storage. For the abandoned Xinji NO. 3 coal mine, available underground space has been calculated and four safety stability evaluation criteria have been put forward for the purpose of selecting proper pressure range of air storage. Otherwise, FLAC 3D software was used to establish mathematical model and analyze the geological safety and stability of the wellbore and different levels of roadways and caverns under 8~10.8 MPa. The results showed that compressed air energy storage in deep underground space of abandoned coal mine can meet the safety and stability requirements of air storage within 10.8MPa after strengthening, which provides the research foundation and theoretical basis for compressed air energy storage in underground space of abandoned coal mine.

It can effectively save energy and reduce consumption for mining enterprises to adjust the speed by frequency conversion by monitoring the coal quantity dynamically . .In view of the existed hardware resources and communication interface of mine, here a dynamic identification and optimization scheme based on image processing is proposed: An adaptive filtering method based on window threshold is proposed to solve the problem of image reflection. It removes the noise effectively while retaining boundary information. In the stage of image segmentation and extraction, a modified adaptive threshold segmentation algorithm based on classification method of EMD is proposed to solve the problems of low boundary contrast and unstable field light sour. The image is processed by the method of first etching and then expanding to improve the boundary recognition accuracy. A continuous frame difference method is proposed to identify the running state of belt. The results of site test show that the system has the advantages of high-performance, which requires no additional equipment. It deserves the value of popularization and application.

In view of the problem that the local resistance between the air chamber and the fan was not considered in the current prediction method of air volume and pressure at the working point of the ground main fan, which would lead to the decrease of prediction accuracy, in order to improve the accuracy of the prediction of the working point of the main fan on the ground, Based on the prediction of air volume and pressure at the working point after replacing the ground main fan in No.2 air shaft of Shiyaodian coal mine of Shenmu coal industry, three methods of measurement, numerical simulation and theoretical formula were used to calculate the local ventilation resistance between the wind tunnel and the fan respectively. The research showed that the numerical simulation method could accurately calculate the local ventilation resistance between the wind tunnel and the fan. On this basis, the nonlinear calculation formula of the local ventilation resistance between the wind tunnel and the fan was established. Combining the measured wind volume and pressure characteristic curve of the fan and the mine ventilation Based on the resistance characteristic curve, the prediction equation of the air pressure and air volume operating point of the main fan was established considering the influence of the local resistance between the air chamber and the fan. The relative errors of the air volume and air pressure between the calculation results of the prediction equation without considering the local resistance between the wind tunnel and the fan and the actual operating point were 8.66% and 12.18%. The relative errors of air volume and air pressure between the calculation results of the prediction equation considering the local resistance between the wind tunnel and the fan and the actual operating points are reduced to 4.12% and 5.57%. The research showed that the local ventilation resistance between the wind tunnel and the fan had an important effect on the working point of the main fan on the ground. Considering the influence of the local resistance between the air chamber and the fan, the prediction method of the working point of the main fan could improve the accuracy of the air volume and air pressure prediction to a certain extent Sex.

In view of the complex hardware and low reliability of the direct collection method of mine multi output intrinsic safe power supply current, an indirect collection method of intrinsic safe current is proposed. Through the comparison and analysis of the structure block diagram of two intrinsic safe current acquisition methods, it is concluded that the indirect acquisition method of intrinsic safe current has the characteristics of simple circuit and high reliability. This paper introduces the hardware circuit of indirect collection method of intrinsic safety current, the software calculation method and program flow chart based on piecewise linear interpolation. The results show that the error of indirect collection method of intrinsic safety current is small, which can meet the needs of field use of coal mine.

In recent years, the domestic coal mine safety situation has improved, but accidents still occur frequently. The importance of comprehensive construction of safety management and control systems is becoming increasingly prominent. The gradual improvement of the informatization and automation level of coal mine enterprises provides a diversified mass data base for the realization of coal mine safety management and control systems. The article proposes a big data platform construction plan for smart mine safety management and control, which is based on big data technology, the current coal mine industry security situation and information systems status. The platform can solve comprehensive data and information collection issues, adapt to industry characteristics, and build the risk warning and research function modules by using big data fusion and deep mining. The platform forms five key technologies. With the improvement of coal mine informatization and the deep application of data mining technology, the big data platform will certainly provide wider and more effective decision support for production managers.

Abstract：In order to better restore the ecological environment of Pingshuo mining area and actively implement the national ecological governance concept, this paper analyzes the basic situation of land reclamation area in Pingshuo mining area, gives the principles of land reclamation and ecological reconstruction, studies the ecological restoration mode of Pingshuo mining area from the aspects of land reclamation, soil reconstruction and landscape regeneration, and through the development of greenhouse cultivation, picking and sightseeing projects, forest Under the cultivation project, mining history museum education project, sports and fitness project, making full use of existing resources and moderately developing industrial projects, etc., created a comfortable and livable human ecological environment in Pingshuo mining area.

The pore and fissure characteristics of coal have a certain influence on gas migration and surface oxygen absorption capacity. In this paper, experimental methods are used to systematically study the pore and fissure characteristics of No. 2 coal seam with low metamorphic degree in Selian No. 2 Coal Mine. It finds that: level III, level IV and level V fractures are well developed with a width of 3-350μm, usually 7-50μm; the pore volume and specific surface area characteristics of Class II, Class III, Class IV and Class V coals were measured experimentally, and The higher the crushing degree of coal sample is, the greater the total number of micropore and the specific surface area of coal sample are; with the increase of coal fragmentation, the adsorption capacity of coal sample and the width between adsorption curve and desorption curve in adsorption loop increase continuously. With the increase of coal fragmentation, the fractal dimension Dn of pore increases continuously. When Dn<2.6, the transition pore occupies the main position, the gas storage capacity of coal body is stronger, and the seepage capacity is weaker, and when Dn>2.6, the opposite tendency received. The larger the Dn is, the higher the degree of coal fragmentation, the larger the specific surface area, and the stronger the ability to adsorb methane and oxygen. The research results provide a basis for gas extraction and natural combustion prevention and control.

When the hydraulic support is subjected to an internal loading test, a certain pressure working medium is applied to the lower cavity of the hydraulic support legs to make the leg support force reach a specific coefficient of working resistance, and this force is used as the test force of the hydraulic support. However, due to the installation angle of the hydraulic support legs, and the friction between hydraulic support canopy and test bed, the test force is actually a component of the support force of the hydraulic support legs, there is a large error between the test force and the actual value. In order to solve this problem, this paper analyzes the internal loading test working condition of 2-leg shield hydraulic support, and the difference between the test force and the legs support force is obtained, then it designs a direct force measuring device, after testing the test force of hydraulic support with different working resistance, it is concluded that the actual test force should be 8% ~ 18% higher than the current loading force, and the technical problem that the test force of hydraulic support cannot be accurately measured is solved.

In the dark environment of underground coal mine, the blind area of the trackless rubber-wheeled vehicle is large, so the obstacle behind the rear of the vehicle and people ’s movement in the vehicle are hard to see and the communication with the people in car is hard to make.Base on this, safety accidents when reversing or people get on or off the vehicle are often happened.In order to avoid the accidents,a low illumination camera based on the high sensitivity image sensor is designed.By adding infrared supplementary light lamp, the imaging quality in dark environment is improved. Meanwhile,video control box, display and vehicle-mounted intercom are designed to realize the functions of reversing image, visible carriage, driving record and voice intercom, which provide guarantee for the driver's safe driving.After industrial tests, it is found that the camera image in the carriage is easily affected by the bright light reflected by the reflective strip on the clothes of the personnel. In addition, the reversing camera is easy to be contaminated. In the future, the research direction will be the bright light suppression and self-cleaning function of the camera.

In order to help the development of Guizhou coal industry, based on the present situation of coal mining, policy and policy, market and other background, this paper analyzes the advantages, disadvantages, opportunities and threats of the coal industry in Guizhou Province by using SWT method, and carries on the quantitative calculation combined with AHP analysis, obtains the weight of each factor that affects the development of coal industry in our province, and puts forward the corresponding suggestions through comprehensive analysis and comparison. It provides effective theoretical support for the development of coal industry in the whole province.