Based on geological occurence characteristics and mining technical conditions of 4-1 coal seam in Shadunzi coalmine, this paper analyses the applicability of slice mining, large cutting height mining, and fully mechanized sublevel caving, and summarizes their advantages and disadvantages. Fully mechanized sublevel caving is selected, and top coal caving properties are analysed. According to code requirement, main equipment selections, such as hydraulic powered support, coal mining machinery and scraper conveyors, are calculated. Mining practice proves the rationality of fully mechanized sublevel caving and equipment selections, which makes much contribution to high production and high efficiency modernization coal mine pattern，and provides important reference for 4-1 coal seam exploitation in Sandaoling mining area.

This paper herein introduced the detailed designing of mine water advanced treatment of Zhong Tian He Chuang Co., Ltd., as well as the investment budget. The economy and technology of two different technological processes were compared. The treatment process, treatment equipment and building were introduced. The effect of investment budget and running cost on economic benefit was presented. The key points of process design were concluded. Result shows that effective integration of the processes of desalination, subsequent concentrations and evaporative crystallization is important to the integral process chain. Conclusively, this paper can provide experience and reference for emissions-free and resource utilization techniques of mine water and coal chemical wastewater treatment.

Mine water prevention and control is very important for mine safety production. Mine water prevention and control is mainly divided into two aspects: roadway water control and surface water control. Surface water prevention and control is the first line of defense to prevent mine flood, and it is very important to protect industrial sites and underground from the threat of floods. Taking Buertai Coal Mine, the one with the world's largest design and production capacity, as an example, it introduces design and construction of rainwater collection system, flood control ditch, rainwater strong drainage pumping station and rainwater pressure drainage pipeline in surface water control project of the mine industrial site. By analyzing the underlying surface conditions and rainfall parameters, a perfect site rainwater collection and drainage pipe network is designed. In order to exclude the catchment of hillside in the southwest of the site, a flood control ditch was designed to drain the catchment of hillside into the Ulan Mulun River. A rainwater pumping station and a rainwater pressure drainage pipe are designed, because the highest flood level of the Ulanmulun River is higher than the lowest level of the site,. A pressure drainage pipe is designed to cross the railway in a sleeve form, which is conducive to energy saving and train safety.

This paper method of quantitative analysis is based on empirical method, but calculation of producing costs further more to each link such as power cost, material cost, repair cost, labor wages, equipment depreciation costs and so on, also considered the differences in equipment production capacity caused by different mining system processes, so investment and production cost are calculated into the unit m3 of production capacity for comparison, in order to reduce human error in the design and to recommend real optimal solutions for guests. This paper analyzed the whole calculation process through a practical case, compared the differences between the traditional empirical method to the quantitative analysis method, highlighted the advantages of the quantitative analysis method, which has important reference and guiding significance for selecting mining system in opencast design.

Baiyanghe mining area is located in the oasis area on the northwest edge of Junggar basin in Xinjiang，The region's ecosystem is relatively fragile and sensitive，The natural forests and public welfare forests scattered along the Alamo River valley play a vital role in maintaining regional ecosystem security.Based on the prediction of the impact of coal mining subsidence in typical coal mines in the mining area,This paper focuses on the analysis of the impact of coal mining in mining areas on the groundwater system and ecosystem in the basin,puts forward some suggestions for optimizing and adjusting mining area planning,provides an important basis for government management to make decisions.

In order to analyze the influence of unstable goaf on surrounding rock support of goaf-side roadway, this paper takes 1322(1) working face in south-first mining area of Gubei Coal Mine as engineering background, through UDEC numerical simulation and field industrial test, makes a thorough study on stress distribution and surrounding rock stability control technology of goaf-side roadway in unstable section. The results show that the goaf-side roadway in unstable section and the goaf-side roadway are stable. Compared with the section, the relative stability time of surrounding rock should be shortened by about 10 days, the roof and floor of roadway should be reduced by 100-150 mm, the two sides should be reduced by 100-120 mm, and the roadway pressure along the goaf in the unstable section is greater than the top pressure, and the coal pillar pressure is greater than the working face pressure. Therefore, the surrounding rock control technology is put forward to improve the stability and bearing capacity of coal pillars, balance the bearing capacity of different strata of roof, avoid stress concentration, transfer roof pressure, and slow down the bearing capacity of roadways. Field application shows that the technology can effectively control surrounding rock of goaf roadway in unstable section.

Abstract: 5 working faces are arranged in the five disk area of 12 coal mine in Ulan Mulun coal mine. The length of the working face is relatively short, the length is basically 1080m, the auxiliary retracting channel from the working face is 113m in the big lane, in order to improve the recovery rate of coal resources in the disk area and reduce the waste of coal resources. Fully mechanized mining face, the auxiliary retracement is used as the return air trough, and the rubber transportation roadway is the main transportation trough. When facing the difficulties of fully mechanized face, 9 empty tunnels are required, of which 8 are parallel to the working face and 1 are perpendicular to the working face. Through the empty roadway, we should mainly consider the choice of the supporting way, how to determine the strength of the pillars, and how to determine the form of the pillar parameters.

According to the geological distribution of the main drainage chamber of the second auxiliary well in Zhangji Mine, the U-shaped steel support is designed for its weak section.The ANSYS finite element analysis software is used to construct the U-shaped steel force model, and the stability analysis is carried out to draw the stress map, displacement map, and bending moment diagram.The results show that the stress is mainly concentrated on the arch foot and the roadway ' s sides. The maximum displacement is 372.783mm at the vault. The maximum bending moment is 162kNm and it is located in the roadway ' s sides. The bending moment distribution increases linearly along the vertical direction of the roadway ' s sides.According to the analysis results, the reinforcement measures are proposed, that is, the reinforcing plates are welded on the U-shaped steel grooves, and are evenly arranged every 500 mm,the concrete is filled in the groove to increase its rigidity.Through the monitoring of the convergence of 60d surrounding rock, it is proved that the reinforcement measures have achieved good results.

According to the problem of large diameter and long-distance gas drainage drilling borehole failure with hole collapse and sticking in soft and breaking coal mass, the theoretical analysis, field test and underground test were used in this paper, the structural integrity and strength of coal mass were obtained by in-situ strength and structural test. Based on the results, the grouting mechanism of soft coal bonding, soft coal integrity and strength enhancing were proposed, the grouting parameters and full-length piecewise grouting technique were designed, this process was simple and fast. It is tested underground that the coal mass strength was increased by 57% and the integrity increased by 58.8%.

The construction of reinforced concrete shell using inflated forms is a new technology for the construction of reinforced concrete shell structure. The technology uses the inflatable membrane as the outer form, and the reinforcement and shotcrete are bound inside the membrane to complete the construction of the reinforced concrete shell structure. This paper mainly introduces the main construction methods, key points of technical quality control and some problems to be further studied.

Aiming at the problems of rock burst can't meet the needs of monitoring and early warning accuracy. It proposed the methods of CT Static Stress Detection-Microseismic and Drilling Stress Dynamic Monitoring-Drilling Cuttings Verification through theoretical research and field measurement. It showed that by field measurement of 3306 working face in yangcheng Coal Mine: The results of static detection are entirely consistent with dynamic detection; Applying this method in 3306 working face, the rock burst hazards which in front of working face 30-50m, 80-100m, 130-140 m and 180-200 m are determined. Targeted measures were taken to solve the danger on the spot. and practiced control by regional and improved the efficiency of anti-scour finely. Safe mining in this area has been realized.

Taking the 4304 working face of Changping Mine as the engineering background, the numerical simulation was used to analyze the roof collapse and the distribution of mine pressure with the working face. It is estimated that the initial pressure step of the working face is 37 m, and there is a large area of roof. And suddenly the problem of falling. Using the advanced deep hole loose blasting technology, the top surface of the working face is weakened. The results show that after the blasting treatment, the average stepping distance of the direct top of the 4304 working face is 15.4 m, which is smaller than the simulation result; the basic top is presented along the working surface. The characteristics of the section pressure are the largest in the working face; during the initial mining period, no obvious pressure phenomenon such as coal seams and coal cannons are observed, and there is no problem of gas overrun in the return air passage. the existence of the lava collapse column on the working face and the weakening effect of the blasting are factors that weaken the mine pressure on the working face. The existence of the lava collapse column in the working face and the weakening effect of the blasting are factors that weaken the mining pressure on the working face.

In order to study the effect of gas drainage in goaf by high-level directional long boreholes, taking 2102 working face of Jining Coal Mine as the research object, the layout and drilling structure of high-level directional long boreholes in roof are determined by means of theoretical analysis and numerical simulation. Five high-level directional long boreholes are designed for gas drainage in goaf. The results show that after coal mining, the height of overburden caving zone is 20 m and the height of water conducting fracture zone is 66 m; the lateral trapezoidal bottom angle 61 and the inner trapezoidal bottom angle 50 are nested in the fracture zone and compaction zone, and the width between the inner trapezoidal and the outer trapezoidal is about 8.4 m; the high-level boreholes should be arranged 40-60 m above the coal seam roof and 15-48 m above the top corner of the goaf, which can effectively solve the problem of gas exceeding the limit in the goaf. Smith drainage has good effect, and saves a lot of control costs, so as to achieve the goal of efficient and stable control of gas in goaf.

Firstly, through field test, this paper analyses the rule of hydrogen sulfide emission and its distribution along the course of cutting coal by road header in fully mechanized driving face, and puts forward the control measures of pre-injection of hydrogen sulfide absorbent liquid to the working face and high pressure injection of hydrogen sulfide absorbent liquid by cutting head with the technology of "three pressure zones". The reasonable technological parameters of the control measures were determined and the control effect was investigated. The concentration of hydrogen sulfide decreased from 269.9 ppm and 151.4 ppm to 27.5 ppm and 17.2 ppm respectively when the road header cut coal at 5m and 15m away from the working face. The reduction efficiency was 89.8% and 88.6%, respectively.

In this paper, Operation and nursing mode of Mine Local Fan in high gas mine in China were analyzed and studied,and An Intelligent Monitoring System by designed and applicated in Lu’an Group Yuwu Coal Company as industrial test site.The system is a control system which mine power supply, mine ventilation and mine automation monitoring is integrated. Safe and reliable operation of local fan is realized by the three-level intelligent joint control of "fan point-underground substation-ground dispatch", the unattended operation of local fan is eventually replaced by manual operation through automatic control, Mines are ensured safe and efficient production by reducing human error and improving efficiency.

For the problem of layered roof fall of different regions of the same roadway, the paper established mechanics model of lintel structure of fracture instability of roadway layered roof, then it put forward the distinguished method of instability of roadway layered roof strata, discussed affecting factors of quantitative relationship between roadway layered roof fracture instability and strata, and accessed instability forms and limit conditions of rock beam fracture of roadway roof, it established the division index system of roof fall hidden danger level of roadway layered roof, put forward the method of hidden danger classification. It took the height of roadway roof fall as classification index of roof fall hidden danger, and developed stability distinguished software of roadway layered roof, mastered zoning characteristics of roof fall hidden danger level of 2-2 coal in Shigetai mine, gave roof support parameters design of mining roadway based on hidden danger classification of roadway roof fall. It realized differential support design, reduced waste of support material, and decreased the accident probability of roadway of high risk roof fall.

In order to research mine pressure behavior in the fully mechanized coal caving face in extra thick coal seams, the 40201 working face of Xiaozhuang Coal Mine was used as the background, and the damage characteristics of the roof of the mining face were studied by numerical simulation, combined with the work surface along the inclination and the working resistance monitoring of the hydraulic support. The analysis and comparison of the working resistance of the bracket determined by the empirical formula show that the weighting interval of the 40201 working face fluctuates between 33.6m and 46m, the average weighting length is 21.0m, and the mining influence coefficient averages 1.42. The top plate load of the working face determined by the formula is 0.94 MPa, which is less than the working support strength of the support 1.28 MPa; the ZF13000/21/40 bracket used for the 40201 working face meets the production demand.

The surface subsidence has great difference when fault exists in overburden strata. To study the influencing factors of abnormal surface subsidence, the mechanism of fault activation was built and the relationship between abnormal subsidence with fault dip,advancing working length,mining height,protective coal pillar and strength of filling material in fault zone were studied by numerical simulation.The result shows that the step subsidence and maximum subsidence will increase with the fault dip as well as the mining height.The step subsidence will increase with the advancing working length when the advancing direction is non-full mining,while it will not increase when the advancing direction is full mining.The step subsidence will decrease with the protective coal pillar width increasing.The strength of filling material in fault zone has small effect on the surface subsidence. The research result has great significance of analyzing surface subsidence laws when the fault exists in overburden strata.

In order to solve the problem of large water inflow in the water-rich roof, the reliability of the anchoring structure is reduced, and the anchoring performance of the supporting body is affected, which leads to the problem that the water-rich roof roadway is difficult to support. In this paper, the 111801 head entry of the Dananhu mine in Hami is used as the engineering background. The combination of numerical simulation and field test is used to study the influence and control of the water-rich roof on the anchoring structure. The results show that the high surrounding rock water content will reduce the effective compressive stress area and compressive stress value of the anchor, which will make the overall performance of the anchoring structure weakly weakened. It is difficult for the anchor to produce effective active support for the surrounding rock. The key to surrounding rock control in water-rich roadways is to reduce the water content of the roof. Industrial tests show that the reasonable water retention measures using anchor cable grouting can reduce the water content of the roof, strengthen the reliability of the anchoring structure, ensure the stability of the surrounding rock of the roadway, and have better technical effects.

In order to study the influence of negative pressure in high suction roadway on gas control in goaf and to find the optimum suction parameters, the vertical height and horizontal distance should be 25 m and 20 m respectively in Zhaozhuang Mine 1309 working face. Fluent software is used to carry out numerical simulation under different negative pressure conditions of high suction roadway, and UDF program is used to define the parameters of goaf to make the simulation results close to reality. The simulation results show that the maximum gas concentration in the upper corner of the working face can reach 18% under the condition of no extraction model, which affects the safe mining. Under the condition of high suction roadway, the negative pressure of suction is increased, the gas concentration in goaf decreases, and the low gas concentration area near the upper corner expands gradually from nonexistence. The increment of gas volume fraction and extraction volume of high drainage roadway tends to be gentle after suction negative pressure is higher than 20kPa. In order to ensure the effect of extraction while avoiding the air leakage in the goaf, the reasonable suction negative pressure is determined to be 20kPa. The average amount of gas extraction in the high drainage roadway is 43.93m3/min on the spot, which is basically consistent with the simulation results.

In order to reveal the law of influence of air volume on wind resistance in fully mechanized mining face, the 215211 fully mechanized mining face in Shenmu Shiyaodian Coal Mine, Shaanxi Province, was taken as the research object, and wind resistances of working face under different air volume conditions were measured on site. On this basis, the complex spatial geometric model of 215211 fully mechanized mining face was constructed by using CFD flow field simulation method. Combining REG k-εturbulence model, the wind flow field calculation model of fully mechanized mining face was established. The structure characteristics of the flow field was simulated and analyzed. It was proved that the ventilation resistance loss of fully mechanized mining face was local resistance loss. On this basis, the wind resistance values of mining face under different air volume conditions were solved. The characteristic curve and function formula of air volume-resistance in fully mechanized mining face was fitted by numerical analysis method. The relationship between wind resistance and air volume was quadratic parabola. The relative error between the calculated results of function formula and the measured results of wind resistance was less than 5%.The research showed that the CFD flow field simulation method could be used to study the air flow law of complex spatial structure such as fully mechanized mining face. The wind flow-resistance characteristic curve of the mining face obtained in this paper provided vital wind resistance parameters for accurate calculation of mine ventilation network.

In order to reasonably evaluate the risk of water inrush from the roof of 13-1 coal seam in Dingji Coal Mine.Discussing seven main controlling factors including core recovery rate, aquifer thickness, brittle-plastic rock thickness ratio, thickness of aquifer, height of fault influence zone, permeability coefficient and fractal dimension of fault as the main control factors affecting the water-rich of roof aquifer, and we use the spatial analysis function of GIS to build thematic maps of each main control factor. Then this paper employ the entropy method to determine the weight of each main control factor and normalize the data, and superimpose the normalized data and weight values of each main control factor with that obtaining the evaluation model of water-rich index and establish water-rich zoning map, and then calculate the height of water-conducting fracture zone after that the zoning map of roof fracturing degree are established. At last, the zoning map of roof water inrush risk has been obtained by combining and superimposing with the above two zoning maps. The results show that the evaluation results are basically consistent with the actual situation, and the accuracy is high, which can provide a reference for the prevention and control of mine roof water hazards.

Abstract: In order to study the consolidation forming characteristics of the guague bulk after lateral pushing under the limited space, based on the filling and coMPacting process of the filling working surface and the working principle of the filling bracket coMPacting mechanism, the components of the filling working surface are simulated.A set of gangue-filled tamping simulation test bench with simple structure and convenient operation was developed independently. The influence of pushing force and water content on the consolidation forming characteristics of gangue bulk was studied by using the simulation test bench.The results show that the effect of pushing force and water content on the consolidation forming characteristics of gangue bulk is positively correlated. When the pushing force is greater than 2MPa and the water content is 3%, the gangue bulk begins to exhibit obvious consolidation forming characteristics.Therefore, the development and application of the gangue-filled tamping simulation test bench provides a certain reference significance for optimizing the on-site gangue-filled mining technology.

The depth of shaft construction was increased to kilometers with the increasing mining depth of coal resources in China. In order to better instruct the shaft grouting construction, research and perfect the flow and diffusion rule of clay cement slurry in the deep rock fracture environment, relying on the scientific research environment provided by the National Engineering Laboratory Research on Coal Mine Shaft Construction Technologies, for the first time, a simulation test of crack grouting under different shaft hydrostatic pressures was performed on a clay grouting test bench. The results show that there are interactions between the main grouting parameters, such as effective slurry dispersion distance, final grouting pressure, hydrostatic pressure, and fracture gap width, in the case of deep well fissures, and the relations between various parameters can be summarized by multiple regression analysis. The correlation equations can be used for the analysis and calculation of on-site construction; the three variation rules of grouting pressure over time are analyzed and summarized, and their correlations with the final grouting consequences are analyzed.

Aiming at the imperfection and poor openness of the communication system required for the coordinated control of the inverter motor all-in-one used by scraper conveyor, the design scheme of communication system used for the coordinated control of the all-in-one based on CAN communication standard protocol-CANopen specification is proposed and the architecture of CANopen protocol is analysed. Using the usart peripheral of embedded microcontroller STM32F407 in the monitoring unit to drive the CANopen integrated communication unit GCAN-305, the hardware and software design of the mining all-in one CANopen communication interface is completed. Experiments show that the all-in-one communication interface based on GCAN-305 complies with the CANopen protocol and meets the reliability and standardization requirements of the mine all-in-one cooperative control data communication.

The silty soils of Thar open pit slope were taken as the research object. Based on the preparation of remolded silty soils with different dry densities, the soil water characteristics curves of silty soils were tested using filter paper method in order to analyze the variation characteristics of matric suction with water content. The soil water characteristics curves were then fitted according to VG model. Furthermore, the functional relationships between the fitting parameters and the dry densities were analyzed in order to develop an empirical model of soil water characteristics curves for silty soils based on VG model with the parameter of dry density. Finally, the applicability of the empirical model was verified. The studies show that the shapes of the water characteristics curves of silty soils with different dry densities are nearly the same. With the reduction of volumetric water content, the matric suction of silty soils increases gradually, with the increasing sensitive matric suction to the variation of volumetric water content. Moreover, the VG model has a good effect on fitting the water characteristics curves of silty soils. Meanwhile, the fitting parameters are linearly related to the dry densities of silty soils. The developed empirical model is more suitable for the description of the water characteristics curves of silty soils with the matric suction less than 300 kPa.

By designing a business platform based on modular ideas, and building a set of production management system suitable for coal mines, it is slow to develop, difficult to maintain, and poorly scalable in the process of information construction of coal enterprises. Problems such as non-uniform standards make enterprise information systems more flexible. With simple adjustments, they can cope with the ever-changing business needs. At the same time, they can fully integrate with existing systems to achieve various business departments and links. The goal of better coordination, improve the reusability of the system, and effectively reduce the information construction and operation and maintenance costs of coal enterprises.

Collapse pit is one of the main forms of surface subsidence in the old mining area experienced small coal mining.Surface collapse may occur suddenly even in non-mining period in some mining areas.Seriously affecting the safety of life and property of residents.This paper is based on the surface subsidence events in a mining area city in northern China,Causes of ground subsidence pits are comprehensively analyzed from coal seam occurrence conditions, coal mining history and natural conditions.According to the mining situation in this area, the housing safety situation near the collapse pit is analyzed.It can provide scientific theory and technical support for the prevention and treatment of ground collapse under similar conditions.

At present, the development of some resource-exhausted cities in China has entered a bottleneck, which has an bad influence on the coordinated development of urban economic and social health, so the transformation of resource-exhausted urban tourism is particularly important. Through the review of the research literature on resource-exhausted cities, the paper expounds the necessity of tourism transformation in resource-exhausted cities, and analyzes the dilemma of tourism transformation in resource-exhausted cities. On this basis, it proposes the countermeasure analysis of resource-exhausted urban tourism transformation in order to promote the development process of resource-exhausted urban tourism transformation.

In order to study the movement of the main frame and floating frame during the work of flip-flow screen, the paper assumes that the real movement of the vibrating flip-flow screen is include translation and rotation movement, the paper ignored damping effect and increased rotation effect and established a mechanical model of the vibrating flip-flow screen, this paper also found analytical solutions by solving vibration differential equations, and calculated the equation of motion of any position in the vibratory flip-flow screen, major analysis the laws of movement and the motion track of feature points. Experiments were carried out to test the motion track of the feature points of the FFS2461 flip-flow screen. Compared the level of fitting between the motion track calculated by theoretical method and the actual motion track. Find the maximum value of the measured amplitude of the measured point and the relative error of the maximum value of the amplitude obtained by considering the rotation method. This paper briefly discusses the reasons for the deviation between the theoretical trajectory and the measured trajectory. The correctness of the hypothesis is verified, and this model can be used to calculate the trajectory and to guide the engineering practice.

In order to explore the method and feasibility of industrial separation maceral of non-cohesive coal and weak cohesive coal in Ningdong Minefield. The floating-sinking centrifugal method was used to separate inertinite in maceral of cleaned coal from Yangchangwan Coal Mine Preparation Plant by centrifugal method with zinc chloride solution close to the density critical point of the various maceral types. The result show that the particle of grinding is more finer, the more favorable to increase the yield of the product close to the density of inertinite. The relationship of the elemental analysis and volatile matter between the known maceral and the separated product is similar but some different. The characteristic of FTIR spectra of 1.34g/cm3~1.38g/cm3 and >1.38g/cm3 density grade's products are similar to inertinite’ s. The results of maceral analyses show that the products with 32.23% and 40.35% inertinite, and its remainder with 57.31% and 63.9% inertinite are separated by floating-sinking centrifugal method according to zinc chloride solution of the density grade of 1.34g/cm3 and 1.38g/cm3. To a certain extent, the purpose of separating and removing inertinite in maceral is achieved.

For the current methane sensors used in coal mines, there are problems of low precision, poor stability and being susceptible to other gases,a laser sensor based on harmonic detection is designed,and the basic principle of TDLAS is analyzed in detail.The overall design of sensor system,laser and control circuit,photoelectric conversion and preamplifier circuit,RS485 circuit,frequency signal circuit and system software design are introduced emphatically.At the same time,the catalytic methane sensor,infrared methane sensor and laser methane sensor are respectively introduced into the standard methane gas sample and diesel vehicle exhaust gas for measurement.The results show that the laser methane sensor has the advantages of high detection accuracy,small error and no interference from cross-gas.In accordance with the requirements of the National coal mine safety standards, it can further ensure the safe production of coal mines.

Abstract: In this paper, the shearer height adjustment system is impacted by external load when it is adjusted, and it is impossible to accurately control and adjust the flow rate, so that the high efficiency is low and the problem of the lifting process of the drum cannot be accurately controlled. For that, According to the target tracking performance, a kind of proposed Control strategy based on internal model (IMC) PID controller. Chose the MG750/1820 electric haulage shearer as an example, through the mechanical principle analysis and the displacement sensor transfer function analysis, the calculation and derivation of the control system structural model is carried out. The assumption condition analysis adopts the H2 optimal control method in the design of the IMC controller. Then according to the relationship between the internal model controller and the feedback controller, the optimal control result is a controller scheme with a PID of the filter. The controller design effect analysis is carried out, and the simulation results are analyzed by Matlab software to verify the effectiveness of the control strategy.

In order to find out the capital stock of China's coal industry, the actual accumulation of material capital is accurately measured. The 1990 period was selected as the base period, and the perpetual inventory method was used to re-estimate the capital stock of China's coal industry from 1990 to 2017. Comparing the estimation results with the existing research results, the results show that the estimation results in this paper are between the existing research results, effectively avoiding the situation of high and low estimation, which is a relatively reasonable estimate. As a result, it can provide data reference for the subsequent research on economic growth of the coal industry.

In order to study the cause of production accidents, a statistic analysis was made for coal mines accidents in China from 2001 to 2015. According to the statistics of the causes of different types of production accidents, especially major safety accidents, the proportion of production safety accidents caused by staff’s unsafe behaviors is more than 97%. Therefore, it is of great significance to study the unsafe behaviors of miners for reducing coal mine production accidents in China. Finally, according to the current development level and employment status of China's coal mines, based on the concept of risk pre-control management, put forward a new idea of coal mine safety production management.