In order to improve the auxiliary transportation efficiency of Dangjiahe inclined mine in Hebi Coal Mine, Shaanxi Province，the transfer auxiliary transportation mode is studied，Overhead passenger equipment for transporting personnel or rail transport materials and equipment in inclined tunnel，direct transportation by trackless rubber-tyred vehicle after rapid replacement of underground chamber. This paper discuss in detail the loading and transporting technology of personnel, materials and fully mechanized mining equipment，design of trackless Rubber Wheeled Vehicl，vehicle configuration and vehicle entry and lifting methods. The results show that trackless rubber-tyred vehicle has large load and strong maneuverability，the equipment of fully mechanized mining face can realize point-to-point direct transportation，fast installation and removal；the number of auxiliary workers has decreased by more than 50%，the comprehensive efficiency of auxiliary transportation has increased by more than 40%；it reduces the labor intensity of workers and fundamentally eliminates the occurrence of various transport accidents.

In order to improve the coal mining rate of the III4303 large mining height working face, the coal mining technology without coal pillars is used to study the coal mining technology without large coal mining face through the combination of laboratory tests, theoretical analysis and industrial tests. According to the test results of the mechanical properties of the soft-molded concrete, the strength of the soft-molded concrete is higher than that of the ordinary concrete. The compressive strength is 38.3 MPa when the standard is maintained for 28 days. Combined with the specific conditions of the working face of the III4303 large mining height, it is determined that the anchor net is used in the lane. Combined support of cable + corrugated steel strip, the width of C30 flexible mold concrete is 1.5m, and the theoretical analysis is used to verify the bearing capacity of the roadside filling body. The engineering practice shows that after the implementation of the non-coal mining technology, the maximum displacement of the top and bottom plates and the two gangs of the return air duct of the III4305 working face are 220mm and 240mm respectively, which ensures the stability of the surrounding rock of the roadway; It is 102 million yuan, which has improved the production efficiency of the mine.

In order to solve the problems of low coal bunker capacity and complex coal transportation routes in mining area, a method of extending coal bunker upward across the intersected roadway is proposed. Through theoretical analysis and calculation, bolt + anchor cable + shotcrete and concrete support technology were used to permanently support the coal bunker without destroying the original coal bunker. Besides, raise-boring machine was applied to further reduced construction period. This method was applied for the coal bunker reconstruction in the second mining area of Chengfeng Company. The results show that this method can increase the capacity of coal bunker and reduce the coal transportation route length in a short time; the reinforcement calculation by SCCT software can obtain reasonable parameters for reinforced concrete when crossing the intersected roadway affected area; this paper can provide reference for underground coal bunker reconstruction with similar conditions.

In order to research into coal and coal and gas outburst disasters early warning system which suitable for complex serious outburst mining area, taking the Shuicheng area in Guizhou province as the research object, from the aspects of model, software, mechanism, equipment, a suitable early warning system for outburst disasters in complex mines is established, which included more than 20 early warning indicators from two aspects of defect of outburst prevention measures and objective hazard, and achieves multi-parameter accurate early warning and timely release of outburst disasters. Field application shows, the system can evaluate and early warn outburst dangerous. The effect is obvious ,provides effective means for scientific prevention of gas outburst disasters.

The developing process and characteristics of large screen display products used in dispatching system is expatiated concisely in this paper , and then it expounds the characteristics and of large screen display system used in Shaanxi Coal and Chemical Industry Group Co., Xiao Baodang Mine dispatch & command center from the seamless visual display, color saturation, color reduction, unit area power consumption, service life, maintenance costs and other aspects, and the importance of large screen display device used in intelligent mine’s safety prevention and control system is introduced as well.

Based on the specific geological deposit conditions of large-scale landslide in Shengli Coalfield, aiming at the safe and efficient recovery of coal resources covered by loose materials under the condition of high soft rock slope, the mining procedure of "cross mining and internal dumping ~ tailing pressure foot" is proposed to change the working line from linear type to Π type. And the safety precautions to ensure the smooth implementation of the project are put forward from the aspects of surface water and groundwater prevention, slope safety monitoring and so on. This paper calculates and analyzes the considerable recovery of resources and the economic benefit of reducing transportation distance and lifting height by adopting the mining procedure of "cross mining and internal dumping ~ tailing pressure foot", at the same time, the value of safe mining and the sustainable development of the mine are predicted.

In order to solve the problem of wiring road parameters optimization in dual-energy truck transportation system, we used MATLAB software to analyze the ramp speed change of dual-energy truck, and determine the speed node of uphill uniform motion, the length of a single ramp and the design speed of road parameters optimization. Then, starting from the influencing factors and significance of road parameters optimization, we proposed the calculation method of parameters, which made the parameters optimization based on the operation performances and road conditions of dual-energy truck, and the optimization results could give play to the performance advantages of dual-energy truck and ensure the operation safety. Taking an open pit mine as an example, the study results showed that the average uphill speed of traditional truck was 15.86 km/h, and the length of a single ramp was 450 m. The average uphill speed of dual-energy truck was 24.43 km/h, increasing by 54.04%, with high transport efficiency. The length of a single ramp was 1050 m, increasing by 133.33%, with strong climbing ability. Convex vertical curve radius of dual-energy truck was 350 m and the curve radius was 120 m. Convex vertical curve radius of traditional truck was 150 m and the curve radius was 50 m. Dual-energy truck needed a larger radius to ensure safety.

Draft survey is a method which is widely used in shipping weighing bulk commodity,At present, artificial observation method is mainly used in draft survey at home and abroad, the ship's water gauge value, liquid tank level of ship, port sea water density are still observed and recorded by manpower. The draft survey has complicated environment, ship tilt, fouling, corrosion and other draft marks objective reasons, and ability of staff observation differences and other subjective reasons, the observation data obtained with great subjectivity, resulting in bilateral trade disputes.According to the draft survey manual observation method can't solve the artificial intervention, artificial errors, low efficiency, many problems such as the dispute, the project is based on the draft survey of automatic measurement as the research core, using sensor technology, wireless communication, image processing of multi subject knowledge,using the method of combining theoretical analysis, optimization algorithm and field test , analysis of different characteristics of the ship's draft video complex environment and the development of draft survey equipment and image recognition software , the project builds a draft survey automatic detection image recognition system. The experimental results show that the system runs stably, with small error and high accuracy. the project thoroughly solves the backward situation of manually observing and recording all the links of draft survey, and finally realizes the scientific, efficient and safe, fair appraisal of the weight of coal carrier in China.

In view of the technical problems of stability control and support in the high stress concentration area of the intersection point of roadway with complex expansion, the paper puts forward the difficulties and key points of support at the intersection point of roadway through the study and analysis of the deformation form and mechanism of surrounding rock at the intersection point of roadway. Based on the theoretical analysis of the rock control support at the intersection point, the flexible support with limited compressive pressure plus the rigid support technology with closed and compressive section is proposed. In the early stage, high strength and high prestress anchorages + anchor cables + grouting combined support are used to control the deformation of surrounding rock to a limited extent, allowing the surrounding rock of roadway to release the surrounding rock stress within a controlled range; In the later period, the deformation of the rock around the intersection point was effectively controlled by setting up a joint support body composed of a special-shaped support frame and a concrete injection to the surrounding rock at the intersection point. It ensures the overall control and stability of the rock deformation around the intersection point and achieves the expected support effect.

In view of the serious imbalance of mining ratio in coal mining enterprises, the shortage of mining replacement and the loss of personnel, track dip roadway (lower section) in Ⅱ63 mining area of Hengyuan coal mine an average of 3.0m per day, slow operation efficiency, long drilling and rock loading time, which seriously affects the speed of roadway excavation. It is proposed that through the introduction of advanced supporting equipment, the mechanized working line of the excavator loader supported by the hydraulic tunneling trolley is formed, which realizes the integrated rapid tunneling operation mode of drilling, rock loading and transportation, and the daily single advance is gradually increased by 4.7m However, there is still a certain gap between the blasting hole loading and the theoretical working efficiency, which provides certain basis and reference for the optimization and improvement of the mechanized working line of the rock roadway and the management of on-site labor organization.

Abstract: The Cuimu Coal Mine has deep mining, thick coal seams and bottom coal. During the excavation, the power of the roadway has appeared many times. In this paper, the excavation of 21306 working face in Cuimu Coal Mine is taken as an engineering example. The microseismic monitoring system is used to analyze the energy distribution characteristics and anomaly coefficients of microseismic events during excavation, and further determine the correlation between rock burst hazard and microseismic early warning parameters. The results show that the microseismic energy and frequency manifestations of different excavation stages are different, but have certain regularity. Intensive large energy events occur when the microseismic energy continues to rise and the frequency gradually decreases, or when the tunneling speed suddenly increases. Statistics show that after the microseismic activity anomaly coefficient is greater than 1.5, a large energy event will occur.

In order to solve the drilling problems of large depth, large friction, complex rock formation and difficult slag discharge in the high ore directional borehole, through optimization of directional drilling equipment, application of mud pulse measurement system while drilling, high toughness auger Drill pipe column strength and effective slagging，directional drilling trajectory design and control technology optimization, and composite directional drilling process to reduce friction, etc., effectively improve the drilling depth of high-position directional long boreholes, greatly improve the slagging capacity of drilling construction, and enhance the adaptability and formation adaptability of high-position directional long-hole drilling technology. It is applied to the high-position directional long borehole construction of Taoyuan Mine II8221, and the maximum depth record of 956 m of high-position directional long borehole is successfully realized. The concentration of gas drainage in the later stage is high and the scalar quantity is large, which effectively solves the problem of recovery gas in the working face. It has achieved good results and provided valuable experience for the application research of high-position directional long hole drilling technology.

In order to improve the gas drainage efficiency of soft and low permeability coal seam, liquid CO2 phase-transition fracturing test was carried out by drilling holes through bottom drainage roadway. The results show that the diameter of the fracturing borehole increases obviously and the radius of gas drainage is 10m after the fracturing of the coal seam. Both the pure gas quantity and gas concentration of borehole gas were greatly increased, although they show a certain degree of attenuation at the later stage of each fracturing, they still remained at a high level. Compared with the measure of hydraulic piercing, liquid CO2 phase-transition fracturing has better effect on enhancing permeability in the early stage. Liquid CO2 phase-transition fracturing not only enhances the gas drainage efficiency, but also improves the speed of mine tunneling, which has significant safety and economic benefits.

Abstract: At present, "time and space" advanced regional exploration and control technology are still have some problems in exploring the design of treatment, the mechanism of grouting transformation and the evaluation of treatment effect. Through the analysis of water inrush types and engineering examples of deep mining floor in Hanxing mining area, the application of this technology in the prevention and control of high pressure water hazard in deep seam floor of Hanxing mining area is studied, and the countermeasures are put forward in view of the problems existing in the application of this technology. Water inrush types of deep seam floor in Hanxing mining area can be divided into three categories: 1 Water inrush types of Ordovician karst water+fault and subsidence column; 2 Water inrush types of Ordovician karst water→Daqing karst water + fault and subsidence column; 3 Water inrush types of goaf water + fault and subsidence column. Type 1 Grouting treatment horizon should select the karst development site at the top of Ordovician lime; Type 2 Should Choose Daqing Limestone; Type 3 should choose the aquifer of Daqing limestone and the location of vertical structure development. Problems in Regional Advanced Exploration and Governance Technology : It is pointed out that geological and hydrogeological conditions should be fully combined in the design of exploration and control engineering; In grouting renovation, theoretical research on grout diffusion mechanism and field test should be carried out to further determine grouting technology and horizontal hole layout distance; The harnessing effect should be re-evaluated through Combining Quantization by Iterative Exponential Method by using water inrush coefficient, water inrush from aquifer, mine water inrush, structural discovery rate and initial Ordovician karst water pressure index and other indicators.

In order to prevent the spontaneous combustion of the coal in the goaf of the 16401 working space of the LaoShidan coalmine, the optical flow sensing system, the oxygen concentration distribution and the temperature distribution of the goaf are detected in real time by using the optical fiber sensing system pre-buried in the channel. According to the preset mathematical model of CFD software, the velocity field cloud map, O2 concentration field cloud map and temperature field cloud map are constructed, and the consistency between the calculated value and the measured ones is established by the model to determine the accurate range of the “three belts” in the goaf of 16401 working space. The distance from 0 to 54m is the heat dissipation zone, 54m~88m is the oxidizing spontaneous combustion zone, and the suffocation zone is more than 88m. The measured data provides a solid theoretical basis for the feasibility of fire prevention measures in the goaf of the 16401 working space in the Lao-Shidan coalmine.

In order to solve the problem of dust pollution in fully mechanized top-coal caving face, this paper takes wangjialing 20106 fully mechanized caving face as the engineering background, the dust characteristics and dust concentration distribution of coal face were analyzed by field measurement method, the control measures based on the dust source tracking system and the combination of static pressure spray and high pressure spray are put forward.It formed an intelligent combined control and efficient dust spray system in fully mechanized top coal caving face, which is composed of a number of targeted dust prevention subsystems,and the working face dust is effectively treated. The application shows that the comprehensive dust removal efficiency of the coal mining machine driver and the operator of support can reach over 90%,the dust concentration in the two entry and return roadways is controlled at about 20 mg/m3, which has a remarkable effect and can effectively alleviate the dust pollution in the working face.

Volatile organic compounds (VOCs) in a coking plant in Inner Mongolia contain high concentration of non-methane total hydrocarbon, benzene, benzopyrene, organic compounds containing chlorine and fluorine, as well as a large amount of hydrogen sulfide, ammonia and other inorganic compounds. The organic pollutants have high concentration, high toxicity and complex composition. There is still a lot of room for improvement in many VOCs processing technologies. Through the development and application of VOC treatment technology, the high exhalation concentration of non-methane total hydrocarbon, benzene, benzo pyrene and ammonia in VOCs were effectively solved. The chemical components in VOCs were recovered by cyclic refrigeration step by step through the vent at the exhaust cylinder of the mechanical slag scraping tank, the emission concentration of non-methane total hydrocarbon is less than 10 mg/m3, and the emission reduction efficiency of VOCs is more than 99% according to the monitoring results. During the whole treatment process, the condensing equipment is in a closed operation state, without adding any chemicals, and no new pollutants are generated, which makes the VOCs treatment achieve environmental protection and zero emission, providing an engineering demonstration for the treatment of VOCs in coking plant.

The Wangjiagou coal mine is a typical shallow buried coal seam mine in northern Shaanxi. The groundwater is heavily distributed in the Sawaiwusu Formation aquifer, which may cause the aquifer to rupture and destroy the water body. In order to effectively inhibit the development of water-conducting fissures and maximize the protection of surface aquifers, based on the principle of coordinated mining, combined with mechanical models and similar material simulation tests, the coal mining method with limited height and retained coal pillars is used to coordinate the mining of the Wangjiagou coal mine. The development law of water fissure zone was studied.The research shows that, based on the coordinated mining mechanics model, the ultimate span of the main key layer is 75m, the spacing of the coal pillars is 70m, and the LCD<LAB can be kept stable. Under the condition of full mining, the overburden shows the two zones of the falling belt-water guiding fissure zone. Distribution, water-conducting fissure runs through the entire aquifer, and the high-coordinated mining overburden presents a “three-zone” distribution, and the water-conducting fissure is closed at the main key layer; the high-coordinated mining uses the support of the coal pillar to control the movement of the main key layer, and then Control the overlying rock movement, effectively inhibit the development of water-conducting fissures, reduce the height of the water-conducting fissure zone, and achieve green water-retaining mining.

With the deepening of coal mining depth, a large number of collapse columns in North China have become more and more serious in the safety of coal mining in this area. It is increasingly important to carry out research on the water inrush mechanism of concealed structural floor on confined water. In this study, the 9102 working surface was simulated by FLAC3D numerical simulation software. From the two aspects of the stress distribution characteristics of floor and the development characteristics of plastic zone, the influence of the concealed structure on the mining face under the working face is analyzed, and the safety distance of the grouting transformation of the concealed structure is obtained. Using the floor strain gauge to monitor the damage of the bottom plate after grouting and verify the grouting effect. Finally, the depth of damage of the floor containing the concealed structure caused by the mining of the working face is obtained, and which provides a reference for the safe production of the concealed structural coal seam on the pressure-bearing water floor.

In view of the difficulty that gas extraction time of borehole along coal seam cannot be reasonably determined, the gas flow characteristics are analyzed based on the theory of coal rock mechanics and seepage mechanics, and then the control factors are determined. The gas density and gas flow in boreholes with different extraction time and combined effect area were compared. The results show that gas density of single-hole has obvious regional difference characteristics under the combined effect of goaf, residual coal pillar in the overlying coal seam and fault zone, and presents similar evolution law of unsteady rise and fall, large attenuation and stabilization stage in different regions. The gas flow of continuous boreholes presents attenuation law of negative exponential. The initial flow and attenuation coefficient are unstable when the main controlling factor is the permeability coefficient, and tend to be stable when the main controlling factor is the effective stress. The best effect is achieved within 60~120 day of extraction time. Meanwhile, the attenuation coefficient of gas extraction can be used as an auxiliary index to judge the difficulty of coal seam drainage.

In order to explore the spontaneous combustion of coal in the high-gas mine in Hunchun area, four coal seams of Banshi 22, 23a and Baliancheng 18# and 26# were selected for the programmed temperature characteristic experiment. The variation rule of CO and hydrocarbon gas production with temperature was analyzed, the indicator gas index of spontaneous combustion was optimized, and the critical temperature of coal spontaneous combustion was calculated. The results show that the critical temperature of spontaneous combustion at Banshi 22, 23a and Baliancheng 18# and 26# is 101.0℃、97.6℃、121.0℃、169.1℃. CO and C2H4 are taken as the main reference indexes for the prediction and forecast of coal spontaneous combustion, supplemented by other hydrocarbon gases, chain-alkane ratio and olefin ratio with good regularity.

Hydraulic fracture of coal seam roof is one of the important means to deal with hard roof and prevent rockburst. In order to study the variation of three dimensional stress in rock owing to hydraulic fracture of coal seam roof, a type of Fiber Bragg grating (FBG) sensor was adopted for monitoring the stress in rock before and after hydraulic fracture, through the field test of hydraulic fracture of coal seam roof. The results show that the magnitude of three principle stress decreases after hydraulic fracture, and the biggest drop is about 20%; meanwhile the direction of three principle stress changes very little. In the working surface coordinate system, the decline of every stress component is affected by the orientation of the fracture plane. Hydraulic fracture of coal seam roof is able to significantly reduce three dimensional stress in roof rock, which has good effect on pressure relief. This study can be used as reference for the layout of hydraulic fracture boreholes, and for the prevention and control of rockburst.

In order to study the permeability of the groundwater reservoir dam, the stress-strain-permeability coefficient of the experimental specimens was studied by using the laboratory similar simulation experiment method using the electro-hydraulic servo rock mechanics tester. The experiment analyzed the variation of the permeability coefficient of different lithological samples under different external stress changes. The study shows the variation of permeability coefficient of different lithologic rocks during deformation and failure: the porosity of lithology itself is one of the factors affecting the permeability coefficient; and the external stress will change the size and quantity of rock cracks and pores: when the outside world When the stress makes the crack of the sample more tight, the permeability coefficient decreases, and conversely, the permeability coefficient increases. Keyword：goaf; dam; permeability coefficient; porosity; strain

Coal mining underground will cause the surrounding rock to move, causing changes in surface morphology, indirectly causing erosion on the slope. Based on the mining conditions and soil erosion characteristics of the Dafosi coal mine, the effects of the thickness of the loess layer on the slope morphology and erosion of the coal mining subsidence area are studied with the thickness of the loess layer and slope type as variables. Using FLAC 3D numerical simulation software to simulate the surface deformation caused by coal mining, the results show that underground coal mining will inevitably lead to slope increase, slope length decrease, slope erosion modulus and runoff modulus increase. The thickness of loess layer greater than 100m can effectively control the slope increase, the slope length decrease, the slope erosion modulus and the runoff modulus increase. The thickness of the loess layer is increased, and the natural slope types corresponding to the increase of slope erosion from large to small are: linear slope, convex slope, concave slope, mixed slope and increasing the thickness of the loess layer is more effective in controlling the influence of the slope morphology and slope erosion.

Aiming at the problem of noise point and missing value in the operating status data of the coal mining machine drive system, a real-time data cleaning platform based on Storm is established. The platform uses ARIMA to establish a data cleaning model, uses the Spout component in Storm to read the point data in real time, encapsulates the data according to the set sample capacity and passes it to the Bolt component, and the Bolt component performs noise point determination, smoothing processing, model selection and other specific data cleaning tasks. The experiment proves that the platform can complete the real-time cleaning of the operating status data of the coal mining machine drive system.

Abstract: the coal resource is still one of the main energy sources in China at the present stage, but the special environment in the coal mining process leads to the occurrence of safety accidents frequently. To happen after the mine environment problems such as complex, dark, poor communication, in order to make the robot to avoid to reach the destination within the roadway barrier smoothly, this paper puts forward A kind of based on the JSP (jump point search) —A * algorithm, at the same time of guarantee to select the optimal path, greatly reducing the traditional A * algorithm in the process of pathfinding extension of the node. Laboratory simulation results show that the improved A* algorithm can improve the speed of finding the optimal path by about 2 times compared with the traditional A* algorithm, which has far-reaching guiding significance in practical industrial production.

The ash content of flotation tailings is an important index of flotation products. In view of the fact that off-line detection is often used to measure the ash content of flotation tailings in coal preparation plants,the on-line accurate measurement can not be realized.And the current flotation soft sense mostly only bases gray image, which results in poor accuracy and adaptability of the soft-sensing model.This paper proposes a soft-sensing method of flotation tailings based on color image processing method, and establishes a soft-sensing model of flotation tailings ash based on least squares support vector machine (LSSVM). The model takes the color features of different color spaces, gray mean and concentration characteristics as input variables, and the ash content of tailings as output variables. Particle swarm optimization (PSO) algorithm is used to optimize the parameters of LSSVM model. The results show that the soft-sensing model of tailings ash can be used to predict the ash content of flotation tailings on-line. The accuracy of tailings image analysis can be improved by introducing color features of flotation tailings images, and the prediction accuracy can reach 96.89%. According to the research results of this experiment, the ash content of tailings can be well measured after its field application in Liuwan Coal preparation Plant.

The effects of dextrin on the floatability of coal and quartz in flotation system and the inhibition mechanism were studied by flotation test, contact angle measurement and single mineral adsorption measurement. The results showed that when the amount of dextrin was 200g/t, the ash was 12.1%, and the clean coal ash was reduced by 1.53% compared with the unadded dextrin. The results of contact angle measurement showed that the contact angle of flotation clean coal increased after adding dextrin, and reached the maximum value of 96.26° when the amount of dextrin was 300g/t, which significantly improved the floatability of slime; The results of adsorption measurements show that the difference in adsorption of dextrin between quartz and coal surface is an important reason for the selective inhibition of dextrin. Dextrin has good selectivity when the initial mass concentration of dextrin is 24 mg/L. When the concentration of the dextrin agent is more than 24 mg/L, the selectivity of the dextrin is lowered, and the fine coal is prevented from floating.

Abstract：Flotation is one of the most effective methods in seperation of fine minerals particals. The correct way to choose regents in flotation is the key step to improve flotation proformance and reinforce the process of concentration recovery. In this study, non-inoic surfactant TX-100 whose characters would be investigate in flotation was selected duing the process of low rank coal flotation. The increasing ultimate combustible recovery values of low rank coal which were treated with a gradual increase in concentration of TX-100 (0 g/t, 50 g/t, 100 g/t, 150 g/t, 200 g/t) from 54.42% to 89.43% demostrated that flotation performance of low rank coal acquired improvement. Besides, contact angle and wetting heat measurements were employed to analyse coal samples treated by different concentrations of TX-100, the increase of contact angle by 13.7°and decrease of wetting heat by 8.031 J/g revealed that the hydrophobic of low rank coal improved effectively which brought about good results on flotation of low rank coal. The changes in surface property of low rank coal before and after treatment were observed through XPS and FTIR measurements in order to investigate the microscopic mechanism of TX-100 on the outstanding improvement of flotation performance, it can be found that the content of carboxyl grouphydroxyl (－COOH) and hydroxyl (－OH) belonged to the hydrophilic groups decreased with the addition of TX-100.

Abstract: Pre-mineralizing device is a crucial apparatus that utilized in flotation pulp pre-mineralization of which performance tremendously effect the result of flotation process. In this essay, the CFD simulation software is induced in analyzing the features of internal flow field of pre-mineralizing device and the differences between two injectors with different feeding method. In addition, the features of dynamic flow field of focused injector is interpreted. The outcome indicates that the performance of pre-mineralization device matches the demand of industrial application.

In order to explore the influence of individual characteristics of miners on near miss, the literature was an-alyzed in depth, the measurement variables of individual characteristics of miners are summarized, and corresponding hypotheses are put forward, the structural equation model is used to construct the initial model of the influence of individual characteristics of miners on the near miss.SPSS24.0 and AMOS21.0 software are used to fit and analyze the model. The results reveal that the factors of miners'individual self-ability are negatively correlated with individual safety behavior; the factors of miners' personality tendency have no significant influence on individual safety behavior; the factors of family guidance have significant positive correlation with individual safety behavior; the factors of environmental satisfaction have significant positive correlation with individual safety behavior; and the factors of individual safety behavior have significant negative correlation with coal mine near miss. Finally, according to the results of the study, the intervention countermeasures are put forward, which can be used for reference in the safety production management and related research of coal mines in the future.

In view of the many influencing factors of coal mine roof accidents in China, the occurrence process is complex and diverse, a risk analysis model of coal mine roof accidents is proposed, which combines improved analytic hierarchy process and catastrophe theory. According to the actual situation of the analyzed coal mine, the subjective factor importance is greater than the objective factor importance, the system mutation membership is 0.79, and the safety level is general. The safety investment in subjective factors is in place and the safety investment in objective factors is insufficient in this coal mine, which leads to sudden changes in the risk of roof accidents. This conforms to the actual situation of this coal mine, and shows that the method based on improved analytic hierarchy process - catastrophe theory can guide the risk analysis of roof accidents in coal mine.