Scientific plan is the basis of high quality mining development. The master plan of Taigemiao mining area makes full use of the resource advantages and the favorable conditions of "one development company for one mining area ". Guided by the principles of innovative, coordinated, green, open, and shared development, this master plan introduces a new mining development model of "resource consolidated allocation, intensive and efficient, intelligent and safe, ecological harmony and scientific development". It aims to promote a revolution of traditional energy and to present a showcase that transforms the development method of coal industry, leads the development trend of coal industry and builds an advanced mining area of the world. In sum, this forward and strategic new development model has certain demonstration significance for similar mining areas.

Aiming at the condition that surficial buildings security would be influenced by the face mining under thick loose bed and thin bedrock, the surface subsidence prediction parameters caused by face mining was studied and determined in combination with the measured results of surface subsidence in surrounding mines. The probability integral method was used to analyze the influence of future mining on surface buildings, and the face mining parameters which conduced to protect the buildings were determined through adjusting the mining boundary and partial mining thick. The results proved that it’s difficult to ensure the safety of the buildings for all mining or partial thickness limitation of the working face, and the working face retracting 44m and 251m along the direction of cutting and advancing respectively could meet the protection requirements of the buildings.

The mine exhaust wind contains abundant low temperature thermal energy. Under the non-extreme weather conditions, the low temperature residual heat in the mine exhaust wind can be used to meet the thermal demand of the well head.In order to use the heat in mine exhaust air to solve the problem of heat used in wellhead anti-freezing, a separation type power heat pipe waste heat recovery and utilization system is proposed. This paper introduces the form of the system and analyzes the system configuration by taking a specific project of a coal mine in taiyuan as an example.The initial investment and operating cost of the system are low and the environmental and economic benefits are good.It provides a new method to solve the problem of mine anti-freezing.

The deep treatment and zero discharge of high salinity mine water is one of the serious problems faced by coal mining enterprises in the western region. Focusing on the high salinity mine water treatment project in Lingxin Coal Mine, this paper discusses in detail the "direct filtration system + reverse osmosis system" advanced treatment process and concentrated saline underground storage technology. Compared with the surface treatment system, the mine water underground treatment system not only achieves the goal of zero-liter sewage in the underground, but also significantly reduces investment and operation costs. At the same time, the use of goafs for underground storage of concentrated saline wastewater also provides a new path for zero discharge of mine water treatment.

The design of the rainwater system of the traditional coal preparation plant generally focuses on the aspects of flood control and drainage, and the low-impact development of industrial plant and water resource cycle are rarely involved. In response to various national policies in sponge cities, promote the application of low-impact development concepts in coal preparation plants, explain the design principles of low-impact development in industrial plants, study on the design parameters of rainwater systems, and deeply analyze the design points of various low-impact development measures, and analyze and summarize the effects of low-impact development. Through the low-impact development of the coal preparation plant, it can effectively realize the functions of reducing the peak value of rainwater runoff, controlling the annual total amount of rainwater runoff, strengthening the water ecological cycle and promoting the utilization of rainwater.

At present, there are some problems in the design of coal gangue dump treatment, such as the low efficiency of mapping and design, and the unclear description of fire-fighting and reburning prevention technology. In view of this situation, this paper uses UAV technology to fly a coal gangue hill treatment area, obtains three-dimensional terrain data, imports it into BIM software for forward design, and makes the construction animation of coal gangue hill fire-fighting and reburning prevention technology to guide the construction. The results show that: the three-dimensional terrain obtained by UAV aerial survey technology can be directly applied to BIM design, instead of CAD topographic map, the mapping efficiency is increased by about 60%; the forward collaborative design using BIM software makes the engineering calculation more accurate, and the design efficiency is improved by about 30%; the animation of fire fighting and re ignition technology made according to BIM model plays an important guiding role in the field construction.

In order to solve the problem of serious fracture and water-carrying sand in the auxiliary inclined shaft of the Zhuanlongwan coal mine, based on the analysis of the current situation and potential threats of the auxiliary inclined shaft, and referring to the relevant treatment experience, this paper designed the treatment measures of "strengthening the bottom plate + strengthening the sand layer behind the wall by grouting".The grouting holes in the wellbore are arranged in a row, the main cement grout is injected, the pressure is strictly controlled during the grouting process, and the bottom plate is monitored at the same time. After the completion of auxiliary inclined shaft treatment, there is no water out in the treatment section. At present, the coal mining equipment on the two working surfaces has been safely passed, and no water out or floor fracture has occurred, indicating that the treatment effect is good.

In order to solve the problem of serious roadway deformation and large amount of advanced maintenance in Ganhe coal mine 2-2092 mining roadway near the goaf, hydraulic fracturing roof cutting technology is used to weaken the integrity and stability of rock strata, reduce the high concentrated stress, so as to make the roadway in the low stress area. According to the actual conditions of 2-209 working face, the relevant parameters of hydraulic fracturing are designed, and the industrial test is carried out. The comparative analysis of monitoring data shows that the floor heave, roof subsidence and two sidewall displacement of 2-2092 roadway after hydraulic fracturing are greatly reduced, the influence of roadway deformation on driving and mining is reduced, and the support cost is saved.

The study of artificial formation freezing temperature field is a necessary method to grasp the development status of frozen wall. Usually, the measured data of the local temperature measurement hole is used to estimate the effective freezing radius of the frozen soil column, and then the frozen wall intersection time is predicted, but this method is prone to blind area of local frozen wall monitoring. In order to accurately determine the overall closure of the frozen wall, the transient mathematical calculation model of the single-hole frozen soil column after a short-term cooling stop was established by longitudinal temperature measurement of the freezing apparatuses, and the complex formula was digitized with the help of Maple mathematical calculation software, and the relationship between the radius of the frozen soil column and the return temperature of the brine and the freezing interruption time was revealed. Finally, taking the Xipang air shaft in Dongpang Mine of China as an engineering case, through the calculation and analysis of the longitudinal temperature data in each freezing apparatus, the weak position of the freezing wall is determined, which provides a theoretical basis for the treatment of the frozen wall effluent accident.

It is the key of safe and efficient production to improve the extraction effect of gas extraction borehole. Based on the analysis of the reasons for the attenuation of gas concentration in the borehole, the mechanism of plugging and increasing permeability of high-pressure gas circulation pulse is studied, and a high-pressure gas circulation pulse plugging and increasing permeability device is developed. The field industrial test was carried out in No.12 coal mine of PingdingshanTian'an Coal Industry Co., Ltd. to establish a repeatedly acting pressurized and depressurized aerodynamic field in the extraction borehole, tear and destroy the coal slag blocking the borehole, and transport it out of the borehole. At the same time, depending on the hysteresis and tensile failure of the coal adsorption deformation, a new crack was formed in the coal around the extraction borehole and the gas flow was opened Moving channel. The results show that the technology of high pressure gas circulation pulse plugging and permeability enhancement has achieved the goal of improving the concentration and flow of gas extraction, and provided equipment and technical support for the safe and efficient production of coal mine.

In order to solve the important problem of hole-hole collapse in high-gas soft coal seam, firstly, by studying the mechanism of hole-sealing in high-gas soft coal seam, studying the fracture field and displacement of the hole-sealing section, comparing and analyzing the theory of hole-sealing by traditional drilling technique and reinforcement technique, secondly, the theory of hole-sealing with "large" wall-grouting "hole-sealing technique is put forward. Finally, in Lu'an Group Gucheng Coal Mine S1303 tape transport for the field verification of sealing technology, the experimental results show that the reinforcement technology is a good solution to the hole deformation caused by unstable gas drainage pipe difficult to send into the designated location.

In order to solve the problem of micro air leakage and spontaneous combustion in the closed goaf of the working face under the condition of deep well and high pressure mining, taking the 11501 closed goaf of zhujixi coal mine as an example, the changes of gas composition, pressure distribution and temperature in the closed goaf were monitored and analyzed. It was considered that the air pressure difference acting on the closed goaf has formed a slight air leakage effect, which is the main reason for the oxidation and spontaneous combustion of the coal in the goaf. Based on this, this Paper puts forward the pressure equalizing fire-fighting technology, which combines the ventilation system with the pressure equalizing chamber. The field practice shows that: after combined pressure equalizing, the CO concentration in the closed goaf was reduced to below 2 × 10-6, the O2 concentration was reduced to 4%, the relative positive pressure in the closed wall of the two roadways fluctuates at 180 Pa, and the difference of the closed internal pressure in the two roadways is basically stable at 10 Pa. This measure could effectively prevent and control the system problem of air leakage in the goaf, and achieve the purpose of restraining the spontaneous combustion of the remaining coal in the goaf.

In this paper, the 2410 comprehensive excavation face of Yuhua Coal Mine in Tongchuan City, Shaanxi Province, is taken as the research object. Through field measurement and simulation, the distribution rule of air flow field and dust field under the single pressure type, pressure type and combination type ventilation and the impact on dust removal efficiency under different working conditions are studied. Firstly, the data collection work is carried out on the comprehensive excavation working face, then the three-dimensional geometric model is established according to the actual situation, and the wind flow field and dust field under different working conditions are simulated and analyzed by FLUENT software, and the comparison of the measured data is verified. The results of simulation and measurement show that the dust concentration of the head-on and roadway is significantly reduced by using the combined ventilation mode of pressure and extraction, because of the good dust removal effect of the wet vibrating string dust removal fan, and the dust concentration of the single pressure ventilation mode is reduced by more than 60%. In addition, the reasonable interval value of the distance between the middle pressure tuyere and the head face of the combined ventilation is studied.

In order to ensure the safe and efficient mining of fully mechanized coal mining face with steeply dipping coal seam and large mining height under the coal gangue interbedded roof, the frequent roof caving disaster in working face is one of the key problems to be solved urgently. The research method of physical similarity simulation experiment and theoretical analysis is used to analyze the stress distribution, evolution rule, failure and leakage characteristics of the coal gangue interbedded roof in the face with steeply dipping coal seam and large mining height.The results show that the roof of the coal gangue interbedded is compressed and fractured above the top beam of the support. During the moving support process, the separation layer and the step sink. The support resistance of the support increases sharply. The fractured coal gangue layer is squeezed and broken due to the repeated support of the support. The support stress is transmitted to the coal body in front of the work. The support resistance decreases gradually, and the support pressure in front of the work face overlaps and increases.the stress concentration causes the roof of the coal gangue interbedded to break in advance and rib spalling. The broken coal rock mass leaks from the front of the support along the coal wall.Through theoretical calculation, the maximum subsidence of the roof before the leakage of the coal gangue interbedded is 1340mm, and the simulation experiment result is 1500mm. The specific measures are: moving the frame with pressure, improving the initial support force of the support, and improving the stability of the coal wall.

In order to grasp the characteristics of coal gangue interbed composite top coal caving in ultra-thick coal seam mining, and ensure the rationality of coal caving technology and high top coal recovery rate, this paper takes ultra-thick coal seam composite top coal mining as actual site conditions, analyzed the deformation, failure and strength characteristics of the composite coal and rock mass by using laboratory tests, numerical simulations, and on-site observations, and revealed the arching of the gangue-bearing coal body during the caving process, the gangue boundary and the caving law, and obtained the coal the distribution characteristics of gangue volume and weight. The results show that: the change of coal-rock proportion has obvious influence on the overall failure form of coal and rock, the damage of composite coal and rock mass is smaller than that of single medium, and the degree of development of coal mass fissures is higher, the greater the difference between the triaxial compressive strength and the uniaxial compressive strength of the composite coal rock mass, the greater the overall strength of the top coal body increases, the greater the probability of top coal arching, the larger the scale of the balance arch, and the orderly placement of single frames. The ratio of coal quantity to low-value area and high-value area of the release rate is about 1:3. The volume and weight of the composite coal rock mass are in accordance with the normal distribution, and the proportion of coal gangue blocks less than 40cm in length is 66%, but Its weight accounted for less than 15%. The main direction of the extra-thick coal seam containing gangue to increase the recovery rate of the top coal is to increase the discharge efficiency of blocks with a length of 40-100 cm.

Aiming at the severe problem of the large-scale mining face during the recovery period of Xiao bao-dang Mine, using the theory of compression bar stability mechanics and MatLab data analysis software, the structure model of "pressure bar" was established, and the mechanical expression of deflection of coal wall with large mining height was obtained. The formula reveals the distribution law and characteristics of the deflection of the large mining height wall when the guard plate provides different horizontal loads and the length of the guard. It shows that increasing the horizontal load of the guard plate and the length of the guard can effectively control the coal wall gang, and finally demonstrate The stability of the coal wall under different mining heights (5.5m, 6.5m and 7.5m) of Xiao bao-dang Mine provides theoretical support for Xiao bao-dang Mine and similar conditions.

Abstract：To make clear the spalling mechanism of coal wall in high cutting and large angle mining face, the model of coal wall spalling was established and Strut-and-Tie theory was used to explain the coal wall spalling phenomenon. By theoretical calculation, the critical force and most prone positon of coal wall spalling was generated. The relationship between mining height, dip, critical force and position of coal wall spalling were analysed. The results showed that: The critical force is related to the mining height and the stiffness of the coal body, and has nothing to do with the coal seam dip. The higher the mining height, the smaller the critical force, the greater the bending stiffness of the coal wall, and the greater the critical force. The position of coal wall spalling is influenced by the stiffness of coal, roof pressure、coal seam dip and mining height and mainly determined by the mining height. The most prone position is 0.398h below the roof. Moreover, the coal wall spalling was investigated in 11073 mining face in Panzhihua mines which are basically consistent with the theoretical analysis. Measures such as increasing the support pressure were taken and the coal wall spalling was controlled effectively.

During the close distance coal seam mining, the surrounding rock deformation and failure of the lower coal seam roadway is affected by many factors. In this paper, based on the 2-2 upper and 2-2 middle coal mining in Gaojialiang Coal Mine, the stress distribution of coal seam floor in different width sections of 2-2 upper coal seam is obtained according to the load transfer formula of coal pillar floor. There are four main influencing factors of coal pillar width in upper coal seam section, coal pillar width in lower coal seam section, layer spacing and coal pillar spacing. Then, the numerical simulation scheme is designed by orthogonal experiment. The area of the surrounding plastic zone of the coal roadway is the index. The influence of the above factors on the roadway damage of the 2-2 coal seam in Gaojialiang Coal Mine is studied. The test results show that the significance order of the surrounding rock failure of the 2-2 middle coal seam roadway in Gaojialiang Coal Mine is: layer spacing > coal pillar spacing > coal pillar width of the lower coal seam section > coal pillar width of the upper coal seam section. This study has certain guiding significance for the development and stability control of the 2-2 middle coal seam roadway in Gaojialiang Coal Mine.

The accurate prediction and control technology of the formation characteristics of the freezing wall is one of the major technical problems in the deep shaft freezing sinking. The freezing process of deep alluvium in the West Ventilating Shaft of Zhaogu No.2 Coal Mine is more complicated. In order to realize the accurate prediction and control of the formation characteristics of the freezing wall and guide the construction of freezing and excavation scientifically, the comprehensive analysis method of the formation characteristics of the freezing wall is put forward, which can be transformed into a dynamic analysis method by refining and decomposing the state factors of daily salt water movement. The new concept of equivalent freezing time is introduced to keep the fast subsection calculation of comprehensive analysis method. Through the continuous analysis and adjustment of the application of the equivalent freezing time, the analysis results of the formation characteristics of the freezing wall with complex regulation are closer to the engineering practice. The application shows that the deviation between the implemented and designed effective thickness of the freezing wall is less than 2%, the deviation between the implemented and designed effective average temperature of the freezing wall is less than 1 °C, and the deviation between the implemented and designed shaft sidewall temperature is less than 2 °C. The dynamic comprehensive analysis method of the formation characteristics of the freezing wall can accurately implement the freezing control and meet the requirements of rapid construction. It provides a successful experience for the accurate prediction and control of the formation characteristics of the freezing wall of the deep alluvium in China.

It is important significance to identify mine water-inrush source for the mine water control. The source of water-inrush comes from different aquifers rather than the same aquifer many times. This paper proposes a model based on the principle of hydrochemistry that there are differences in hydrochemical characteristics between different aquifers to identify the source of mixed water-inrush. Taking Jinggezhuang mine in Kailuan as an example, judge the source of the water sample to be identified by drawing Piper's three-line diagram. Establishing the mixed model of mine water source which took six conventional ions and the pH value as identification factors by using the software PHREEQC , and proposed a model for judging the water source of the mixed water-inrush which was according to the calculation result of Euclidean distance. The results show that Piper three-line diagram combined with Euclidean distance is an accurate and feasible model to identify the source of mixed water-inrush.

In order to effectively control the spontaneous combustion problem of spontaneous combustion, the influencing factors of static oxygen absorption in coal seams were studied. Study the influence of granularity, temperature and porosity development on the static oxygen uptake by The ZRJ-1 coal spontaneous combustion propensity measuring instrument. Experimental results show that: the static oxygen uptake of coal increases first with the increase of granularity, and the particle size is 35-60 mesh to reach the maximum oxygen uptake, and then decrease; the static oxygen uptake increases first and then decreases with increasing temperature, and the maximum at 100 °C; the macropores and mesopores are the main components of coal pore volume, and the specific surface area of pores accounts for about 10%, which has little effect on oxygen uptake during warming and oxidation; the ratio of the specific surface area of the transition pores and the micropores is 75% and 15%, which has a great influence on the oxygen uptake.

In this article, the air leakage in goaf of the workface by U-type ventilation of the coal mine of Wenzhuang was tested by SF6 tracer gas technology. The results of tests showed that there were few channels of air leakage. The air leakage ratio of the goaf was 16.31% and the air leakage viscosity was from 0.032 m/s to 0.128 m/s. The results of numerical simulation show that the air leakage paths of the goaf with U-type ventilation were U-shaped. The air flowed in from the intake side of the workface and went out from the return side. Spontaneous combustion is more likely to occur in the upper part of the goaf in the roadway area of the working face. The three zones of goaf distribute in bar shape. The range of the three zones changed with the height. The area of oxidation zone increased first and then decreased with height and the area of heat dissipation zone gradually disappeared when the height was higher than 16.3m.

When single-phase to earth fault occurs in the mine power supply system, the collected signal contains a lot of noise because of the bad underground environment, it’s easy to cause the problem of wrong or missing selection. In order to improve those problems, this paper proposes a single-phase to earth fault line selection method based on EEMD and wavelet threshold denoising. Firstly, EEMD is used to decompose the collected zero sequence current signal. Secondly, the wavelet threshold denoising is used to extract the high frequency imf1 component. Thirdly, the Hilbert transform is used to extract the instantaneous amplitude of the imf1 component after denoising. And finally, the fault line is judged according to the principle of maximum energy proportion. A 35/6kV simulation model of mine power supply system is built by RTDS real-time digital simulation system , the line selection method is verified by fault simulation. The result shows that this method has better accuracy and timeliness in different fault conditions.

Aiming at the complex nonlinear relationship between mining subsidence and multiple influencing factors, an Adaboost strong prediction model (Adaboost-PSO-BP model) based on particle swarm optimization to optimize BP neural network is proposed. The prediction accuracy is improved, and the mean of the average relative error is optimized. The results shows that the strong prediction model combines the characteristics of the Adaboost algorithm with a large prediction error and the particle swarm algorithm to optimize the weights and thresholds of the neural network, which achieves the purpose of "optimizing the best" of the strong predictor, which confirms the Adaboost-PSO-BP The feasibility and practicability of strong prediction model in the prediction of mining subsidence.

This paper analyses the geological conditions of room - pillar mining system goaf. Taking the construction of natural gas pipeline as an example, according to the requirements of relevant codes, this paper calculates the displacement and deformation of surface residual influence in mining subsidence area, analyses the safety of the damage height of overburden and the influence depth of construction project, and analyses the long-term stability of coal pillars. In this paper, measures and suggestions for goaf treatment are put forward. The technical ideas in this paper can provide technical reference for the stability evaluation of surface construction site in room-pillar mining system goaf.

Modern new coal chemical industry is an important direction for the clean utilization of coal. It belongs to technology, capital, and resource-intensive industries and it is faced with factors such as technological maturity, investment scale, carbon dioxide emissions, and environment. In order to evaluate the benefits of modern coal chemical projects based on environmental constraints, this paper carried out a screening and identification study of economic risk types, impact factors and degree of impact of economic risks of coal chemical projects based on environmental constraints, especially for potential and possible water pollution，atmospheric pollution, solid waste pollution, carbon emissions and other environmental risks, quantified the environmental losses such as land and atmosphere that may be caused by pollutant and carbon dioxide emissions. According to the characteristics of the coal chemical industry, especially the characteristics of large environmental risks and large water consumption, the cost-benefit analysis theory was used to construct a modern coal chemical project benefit evaluation method based on environmental constraints, determine the cost and benefit categories, and establish the modern coal chemical project benefit evaluation method and model based on environmental constraints.

Abstract: Xinjiang Zhundong high inertinite of coal was selected to prepare activated carbon. The influence of carbonization process on iodine adsorption was studied according to the characteristics of Zhundong coal pyrolysis. Based on the Box-Behnken response surface methodology method, the activation process parameters were discussed and a prediction model for iodine adsorption was established based on activation temperature, activation time and water vapor flow. Researching the highest iodine adsorption of activated carbon by liquid nitrogen adsorption and scanning electron microscopy，the optimum activation conditions for preparation of activated carbon was as follows ：activation temperature of 900℃, activation time of 90min, and water vapor flow rate 4ml/min.

In recent years, with the adjustment of the national coal industry, the major mining bureaus are trying to improve the tunneling speed of the roadway, so they put forward higher requirements for the supporting equipment after the rapid tunneling of the coal roadway. According to different roadway driving modes, various types of bolt support equipment are developed successively. According to different geological conditions, two arm bolt drill with supporting roadheader, four arm bolt drill with supporting continuous mining machine and bolt transfer unit with supporting bolt driving unit are developed successively. Each of the three matching modes has its own advantages, but they can not be replaced by each other. Therefore, it is necessary to select the matching mode according to specific geological conditions.The way of driving.

Based on the new requirements put forward by the high-quality development of the coal industry in the new era for the construction of safe, green, intelligent and efficient new mines, combined with the development status of EPC and the development model of research-design institute integration with the trinity of researching, designing and construction business, we proposed REPC, a general contracting model led by research in coal industry，discussed the connotation and advantages of the REPC model as well as its application scope and implementation framework. Taking an example of a coal mine gangue filling general contracting project in Ordos, Inner Mongolia Autonomous Region , analysis the positive effects of the REPC model on improving the scientificity, innovation and reliability of the project .

In order to promote the construction of coal mine projects well and quickly, and achieve the construction goals of "good safety, high quality, short construction period, low investment, and good efficiency", this paper analyzes the 106 coal mine project based on the successful construction of the 106 coal mine project in Xinjiang. Based on the targeted measures and experience taken from the four main aspects of “investment, progress, quality, and safety”, 106 coal mines are more successful in all aspects through these measures, and the results show that the “four major controls” can promote safer coal mine projects Efficient construction.

The binding force of environmental measures and laws and regulations is not the same in all parts of China. The new environmental standards require coal enterprises to strengthen the ecological environment governance, but the impact on the financial performance of enterprises is different. Based on the data of coal listed enterprises in 2011-2018, the paper uses the short-term and long-term financial performance indicators as the dependent variables, and environmental performance as the independent variables, and uses the double difference (did) model to test the impact of environmental performance of enterprises under different environmental constraints on the short-term and long-term financial performance. The results show that: under strong environmental constraints, the environmental performance of coal enterprises is positively related to the long-term financial performance, and negatively related to the short-term financial performance; the short-term effect of strong policy constraints is not good, but effective in the long run. Finally, the paper puts forward relevant strategies to achieve the win-win of environmental performance and financial performance under the cooperation of government and enterprises.

The coal resource tax is selected as the research object. Taking coal enterprises and coal-burning power enterprises as the carrier，based on the analysis of the coal-fired power market structure, the demand elasticity and supply elasticity measurement models are constructed respectively through the extended Linear Expenditure System and the Cobb-Douglas production function. Combined with the taxation policy and actual situation of coal resource tax, the paper analyzes the tax shifting effect of coal resource tax, and then puts forward relevant suggestions for the development of coal-fired power enterprises. The study found that price changes are the most direct effect of the transfer of coal resource taxes. For every 1 yuan increase in coal resource tax, coal prices will rise by 0.69 yuan, and electricity prices will rise by 0.55 yuan; Since coal enterprises cannot shift all the taxes, the taxes that cannot be shifted will inevitably affect the output of coal enterprises, resulting in the decline of coal supply.