Based on coal mine in Bulianta tower 8.0 m large mining height coal seam occurrence condition and the hydrogeological conditions, the state of numerical simulation and theoretical calculation analysis method, studies the 8.0 m working face of large mining height are broken water inflow, water storage space and water flowing fractured zone height and the strength of the artificial waterproof seal. The results show that the water gap of the high working face of 12511 is directly communicated to the surface, and the crack ratio is 23.78, which meets the requirements of the construction of underground reservoir to guide the water channel. Through the analysis of large mining height are broken on the working plane of fracture structure and the boundary strata overburden stratum displacement path curve, determine the mined-out area's largest water is about 5058773 m3, meet the requirements of underground reservoir for storage. Through the analysis of the strength requirements of the coal pillar and the artificial waterproof sealing wall, the safety technical requirements of the operation of underground reservoir are put forward. Based on the above analysis results, the requirements of the construction of the underground reservoir in the coal mine are met with the requirements of water source, storage capacity and water channel.

Disaster induced by high-intensity weighting of hard roof becomes increasingly drastic in the past decade. For promising safe mining in such longwall faces, influence of roof cutting and stress releasing on mining pressure occurrence is analyzed in the present paper. 14141 longwall face of Jiulishan mine is affected by faults with large drop. Besides, main roof of the coal seam is hard. High-intensity fracturing of the hard roof may lead to fault activation, which dredges the water channel between longwall face and floor aquifer, and further cause water inrush accident. After roof pre-blasting, a vertical fracture is produced and the internal stress work rate needed to drive fully fracturing of main roof is decreased. Thereafter, limit span of the main roof becomes small. Support resistance during roof weighting is in direct proportion to the limit span of main roof. That means roof cutting can effectively drop weighting intensity of hard main roof. Blasting holes are drilled in the open-off cut and main gate. After blasting, vertical fractures are produced along dip and strike directions respectively, in the main roof of the open-off cut and main gate. Field measurements demonstrate weighting span is decreased and weighting intensity is weakened after roof cutting.

In the inclined shaft, the tube well dewatering is adopted to improve the stability of the surrounding rock by reducing the water level of the aquifer, so that the soil consolidation, to prevent the work surface collapse, roofing accident,Which laid the foundation for the rapid and safe construction of the inclined shaft, and provided the reference for the construction of the wellbore under similar conditions.

To solve such problems as small internal dumping space, long transport distance, and long exposure time of slope, the geological conditions of IV coal seam were analyze, the mining technology which called cross mining and internal dumping with burying slope was proposed, the benching methods and working line layout were designed. Then the production intensity for cross mining and internal dumping in Zaha Nur surface mine was synthetically determined in terms of equipment capacity, coal quality balance and internal dumping space. The exploitation amount of IV coal seam is 4.8Mt/a, and the advance rate of cross mining work line is about 350m/a.

Aim to the management leaks for the in-pit attendance has because of the single function of the existing uniqueness detection device, a uniqueness detection device based on iris recognition technology is designed in this paper. The device integrates iris recognition, identification card inspection, alcohol inspection, in-pit knowledge test and face capture. It can achieve the personnel uniqueness detection automatically according to the in-pit attendance process. Finally, the uniqueness detection device was tested in the coal mine field, the test results have shown that the device can complete the uniqueness identification quickly, accurately detect exceptional?cases about the personnel entering into the coal mine, and it can capture real-time scene photos as the evidence for the reference in the future.

Absrtact: In order to effectively solve the problem of vehicle pollution and long distance and large slope transportation, a new type of mine double-electric trolley auxiliary transportation system is put forward. The system is composed of power supply system, contact net system, charging station, collector and double electric vehicle. It has three operation modes: quick charging, stringing and mixing. This paper puts forward the key technical indexes of each subsystem, and expounds three operation modes in detail. Finally, the auxiliary transportation system of three key technologies: DC750V traction substation capacity and power supply arm matching technology, DC750V network technology, contact and further study on calculating the vehicle battery type and capacity of electric double, and the corresponding solutions, provide technical support for the realization of the future mine trolley auxiliary transportation system.

The intelligent building is an important task facing the coal enterprise using the networking, informatization and artificial intelligence technology. Based on the analysis of Zhangjiamao coal preparation plant composition and washing technology, product structure, management and production status quo, and the construction thought of intelligent mines and factory, combined with intelligent application platform of Zhangjiamao, task objects and specific contents of the intelligent building are determined. According to the requirements of the task objects, the intelligent architecture for the coal preparation plant is desiged, including a hierarchy, the role and function of each level. On the basis of the intelligent architecture, the system structure diagram also is desiged. Intelligent system structure and solutions for coal preparation plant of intelligent construction to provide the basis.

At present，most domestic coal mine adopts shaft development way with coal seam buried deeper and deeper in our country. Therefore, the effect of hoist building which is one of main hoisting system of the building is particularly important. Combined with the design of Mengcun coal mine main shaft hoist house, the article introduces architectural design，structure lectotype，calculation points and calculation of anti sliding and anti overturning of hoist foundation in detail, and puts forward some experiences about the problems that should be considered in the design process, to be discussed in this paper.

Abstract: According to the problem of multi seam mining in the process of interlayer distance changes at Zhuangshang coal mine in Liulin,Shanxi province, by means of theoretical analysis combined with numerical calculation, determined the stress and plastic zone distribution law under coal pillar, determined the contrary of interlayer distance changes with different support mode: when the interlayer distance changes in 4-5m,take the way of erection single prop, shorten the length of anchor to support roadway roof, strengthen support of the coal wall near the pillar side to reinforcement support. when the interlayer distance changes in 5-7m,no need to erection single prop,increase the the length of anchor to 4.5m.Through the analysis of pressure observation results during the mining period, the control of surrounding rock of roadway is basically stable, the supporting scheme satisfied the demand of safe mining.

with the end of the "golden decade" of coal mine, the cost advantage decreased, making the internal optimization of coal enterprise become an effective way to increase the efficiency. Roadway drivage is the basic process in coal production, the drivage working procedure and the sequential optimization will play the role on the improvement of the coal production, but some unreasonable production process of the current roadway drivage need to promote, such as unreasonable link of production process, time gap of production process, the lacks of production management. Against the above problem, this paper surveyed the whole aspects of operation procedure of excavation and the concrete situation of labor organization, based on the specific coal field investigation in a coal mine 31119 digging face as the research object. Finally this paper solve the problems of cutting coal and temporary support and permanent support etc., which provides effective reference value for the optimization of the transformation of coal mine enterprise.

To relief the link of mining and roadway excavating and face the strict claim about safety distance of the new Coal Mine Safety Regulations, analyzed the principle of carbon dioxide pre-splitting control of deep hole technology to promote the roadway excavating speed, tested the change law of coal mass parameters at the static state and under the roadway excavating state in N1101 working face of Yuwu Mine, and counted the daily amount of tunneling and gas density of return airway about pre-splitting and after splitting time. Field test dates shown that after splitting, the values of K1 and S had big changes, the daily amount of tunneling was more than 30%~100%, the gas density of return airway was reduced about 16.7%. Proved that this technique could reduce the risk of coal and gas outburst in tunneling faces, speed up the methane desorption speed, improve the roadway excavating speed, ease the problems of replacement of mining and roadway excavating.

In order to solve the problem of poor gas drainage borehole sealing, large air leakage and associated spontaneous combustion of broken coal, a new drilling and sealing integrated sealing technology is proposed to seal the borehole of gas drainage. Drilling and Sealing Integral Sealing Technology Seal drilling holes, injecting flexible paste sealing materials, and spraying the viscous inorganic sealing materials around the drilling holes to realize the dynamic sealing around the new drilling cracks, isolate the broken coal Contact with the surrounding air to improve the concentration of gas drainage and reduce the risk of spontaneous combustion of broken coal. The field experiment of Xiaohaizi Coal Mine shows that the leakage of coal around the gas drainage borehole is greatly reduced after adopting the new drilling and sealing integrated sealing technology, the gas extraction concentration is 2.7 times higher than that of the conventional sealing hole drilling, Temperature decreased by 12.8 ℃, broken coal spontaneous combustion risk significantly reduced, and effectively protect the safety of gas extraction and efficient work carried out.

根据城郊煤矿21608综采背拉工作面的实际地质条件，解析了大倾角仰采段煤壁失稳机理及影响因素，在加强支架位态和初撑力管理的基础上，研究应用了优化工作面回采技术参数、单体支柱抬棚和玻璃钢锚杆联合支护、超前注浆加固等片帮防治三级技术体系。现场实践表明：实施上述技术措施后，大倾角仰采段片帮范围可防可控、动态缩小，安全经济效益显著，为其它类似条件下工作面布置和片帮防治提供了借鉴，为矿井稳产、提高煤炭资源采出率奠定了基础。

In order to solve the problems of 824 inside working face in the Qingdong coal mine, the loose blasting technology was applied, and the ideal result was achieved. According to the geological and production conditions of working face, the parameters of loose blasting and technological process were obtained. The results showed that the loose effect produced by loose blasting was excellent, while the coal and rock mass were fully pre cracked and loose. The loose blasting was conducive to the coal mining machine passing through the fully mechanized mining face smoothly and quickly, without excavation and cutting again to continue to continue mining. The successful application of this loose blasting technique provides a useful technical experience for the engineering application of the similar hard coal fully mechanized mining face passing through fault.

Summary：In order to improve the lump coal rate,According to thevarious factors that influence the lump coal rate Sunjia Cha Longhua coal mineCombined with the actual situation,the technical research is carried out to increase the lump coal rate at the source of raw coal and reduce the loss of lump coal in the transportation process. Such as coal face loose blasting, coal drum parameters optimization, crusher hammer height optimization, tape machine loading point transformation and installation of raw coal silo chute. The results show that after the technical research and application of lump coal rate on the basis of the original increase of 10% -12.5%. The effective implementation of the technology to the mine in the market downturn is still under the circumstances to achieve a better economic benefits, with a certain practical value.

Roofbolter is equipped on kinds of bolt support equipments as an important working mechanism. Because the current roofbolter is asymmetric in structure, various faults occur. And stoppages degrade these equipments’ whole performance. The structure of the asymmetric roofbolter is introduced in detail. Various faults caused by long feed cylinder and short feed cylinder are all described respectively. The causes of the faults are analyzed specially. And the improvement direction and method is presented in the end. This essay is conductive to cognize the framework and fault form of asymmetric roofbolter, and it also can provide theoretical support to improve roofbolter’s structure in the future.

Abstract: Based on the study of coal quality in Dingfu Geng Group, the proportion of coal blending was determined by using the complementary characteristics of Dingfu Geng coal and repeated experiments. Production for the selected raw coal high-ash fine gangue more features, through the optimization of crude coal recovery process and other measures to innovate the difficult selection of coal washing technology. To solve the problem of insufficient raw coal into the feed, so that enterprises into the benign development of efficient production track.

The roof of large span roadway in thick coal was soft and broken and the separation of expansion was easily happened in this roof. These features can easily led to the broken of anchor ropes and the destruction of support structure, and caused the roof fall accident. The large area roof fall of 20322 haulageway during roadway excavation was chosen as the research background. The paper analysised the pressure phenomenon before the roadway roof-fall accident and concluded that the main reasons for the instability of the roof structure were the fractured surrounding rock and the unreasonable parameters of anchor cables. The supporting idea of enhance the integrity and strength of the roof support structure through the adjustment of the anchor cable supporting parameters to control the soft thick coal roof was proposed and good results have been achieved in the practice of the industry.

In order to prevent water-inrush from floor in working face and ensure the safety production of mine, take the 11141 working face of Liangbei Coal Mine as engineering background, numerical simulation was applied to study the influence of different conditions on the floor failure depth in coal mining above aquifer, such as advanced distance of working face, burial depth, thickness of coal seam, fault and fault location. The study results showed that: the greater the advanced distance of working face, the greater the floor failure depth, but after a certain distance, the floor failure depth remain unchanged and tend to stable; the greater the burial depth, the greater the floor failure depth, but the increase speed will decrease; the greater the thickness of coal seam, only increase the damage range of floor, there is no influence to the floor failure depth; the floor failure depth is greater when there is a fault, it will be more severely to the impact of the floor failure depth when the fault is located within the range of first weighting than which is located within the range of periodic weighting. The research conclusion can give a reference to the safety mining of working face in coal mining above aquifer.

In order to solve the risk assessment of water inrush in the aquifer of weathered bedrock of coal seam roof in Ningtiaota Coal Mine. Based on the analysis of the development characteristics of the weathered bedrock, according to the geological and hydrogeological data, including the proposed water enrichment evaluation index system of the degree of weathering, including weathering index, aquifer thickness, permeability coefficient, brittle plastic rock thickness ratio, unit water inflow and core take rate, and on this basis of weathering the bedrock aquifer of water abundance evaluation. In order to predict the height of water-conducting zone of the roof more accurately, corrected the empirical formula according to the measured data, and obtained the formula for calculating the height of the water flowing fractured zone which accords with the actual situation of the study area. According to the calculated height of water-conducting zone, the safety of roof cracking is partitioned. Combined with the result of water abundance evaluation, the risk of water inrush from bedrock aquifer of coal seam roof is evaluated.

摘要：为实现高瓦斯和煤与瓦斯突出矿井受采动卸压影响的下伏煤层瓦斯抽采，以山西晋城矿区寺河煤矿3#煤层5303工作面为研究对象，系统研究了3#煤层采动卸压后下伏9#煤层岩体的裂隙发育规律、应力分布特征和渗透性变化特性；数值模拟表明，工作面受采动影响垂向卸压范围可达71.43m，9#煤层在底鼓变形带内，最大卸压值可达3.61MPa，使得该区域裂隙发育，渗透率提高。本文研究提出了一种煤矿瓦斯地面抽采新模式，即采用斜直井钻机地面施工L型井方式抽采经采动卸压的下伏煤层瓦斯，其研究成果对同类煤矿开采条件下高瓦斯和突出煤层瓦斯抽采工作具有重要指导借鉴意义。关键词：采动卸压 下伏煤层 瓦斯 “L”型井 抽采

Now the breadth and precision of sandstone hydraulic parameters can’t adapt to the requirement of water yield prediction and seepage property evaluation, then the results can’t accord with the fact. In order to estimate the permeability of sandstone, an important hydrogeological parameter, a mathematical model between the macroscopic permeability and pore fractal dimension was created based on fractal theory and Unequal capillary columns model. To test the accuracy of the selected theory and the reliability of the professional image software, the macroscopic permeability of the samples on the main sandstone aquifer obtained at borehole on a coal mine in Tangshan were measured and Scanning election microscope and Imagepro Plus software were also used to get SEM image and calculate the theoretical values. By comparison, the results show the error between the theoretical value and the measured value is small and these selected methods and built models are reasonable.

Based on the evaluation data of coal resources potential in Heilongjiang Province, the structural characteristics and evolution process of the regional basins are analyzed, and the occurrence and structural control characteristics of coal-bearing are analyzed.Data analysis shows that eastern Heilongjiang Province, a large continental margin coal basin was formed in the early Cretaceous, In Late Cretaceous, the large basin was destroyed because of the strong convergence of plate subduction. The tectonic evolution of the coal-forming basin has undergone two periods of structural subsidence and two tectonic reversals.The tectonic subsidence of two periods formed the coal-forming basin in the Heilongjiang Province, and the subsequent two structural reversals have some destructive effects on the coal-bearing occurrence.The superimposition of the two tectonic actions has resulted to coal measures occur in a series of isolated small and medium-sized coal basins.

Coal mining enterprises have their own power supply network. Underground production mainly depends on electric energy, which can ensure normal operation of mine ventilation, gas drainage and discharge of coarse coal. Lightning strike of mine power grid will lead to frequent occurrence of blackout accident and cause a serious threat to underground workers. So it is significant to do a good job of lightning protection work in mining area. Zinc oxide arrester without gap operating usually operates under power frequency and has a current through the valve piece. These will cause aging of valve piece, increase of impedance leakage and temperature, which will cause accidents. So it is necessary to make an online monitoring on the running status of arrester to avoid hidden danger. In this paper, a new extracting method of resistive current is put forward and a mathematical derivation is adopted. And a simulation based on Simulink is used to verify the correctness of extracting principle.

The main products of methanol to olefins are ethylene and propylene. Therefore it is important of study the influence of reaction conditions on product distribution for improving the yield. Based on the 60wt/a industrial MTO device, this paper research the effect of temperature, pressure, carbon content, catalyst reserve and circulation rate on the product distribution. Results show that increasing the reaction temperature can significantly increase the selectivity of dienes and methane. When the temperature is above 490℃, the acetylene content increases obviously, which is harmful to the subsequent separation process. Low pressure is beneficial to increase ethylene selectivity. Higher carbon content can improve the selectivity of ethylene and propylene and reduce the yield of C4 and C5+. The catalyst reserves and circulation affect the residence time distribution of catalyst, and larger cycle is favorable for producing more ethylene.

The Fukang western mining area is located in the foot of the Bogda Mountain fault-fold belt and the Fukang syncline lift in the southeastern margin of the Junggar Basin. This research combined with the logging,mud logging,test,seismic and drainage date of 40 exploration wells in this area,taking Badaowan formation A2 coal seam as an example,through statistical, regression and comparative analysis method to analyze the geological factors influencing the productivity of CBM wells.The results show that the buried depth, thickness, gas content, permeability and structural position are the main factors influencing the productivity of CBM wells in the Fukang western mining area,according to the different well sites to optimize the drainage system,guide the reasonable drainage of CBM wells.Furthermore,the results can provide geological basis for the later well deployment.

Fracture-forming effect evaluation in CBM well has not formed a complete and mature evaluation system and industry standards currently. It is necessary to study the effect of hydraulic fracturing on the specificity of coal reservoirs and technologies. This paper has analyzed the geological and technological factors effected the fracture-making, and some index has been preliminarily selected, they were the strength coefficient of the coal rock, buried depth, number of natural fissure, length of fracture, fracturing pump, pressure, time and fluid viscosity. The principal component analysis method was applied to pick up three principal components from the multi-indexes and the three principal component property factor of the coal reservoirs mechanism, the natural fracture and hydraulic fracturing technology factor which could instead the 68 percent of total index information. Finally, according to the weight sum of the principal component score, the value range of each index under the best effect of fracture-making could be scientifically predicted, and objective and reliable basis for CBM development and utilization in the future can be provided.

In order to reflect the varying law of the deflection of the mine shaft steel guide when the relative motion occur between the rigid guide and the cage roller, transient dynamic simulation is carried out for simply supported beam model ,the three-span continuous beam model and the spatial grid model of mine shaft steel guide structure by ANSYS. Simulation of the horizontal force through a section of the guide evenly, the deflection curves of the model with the position of the moving load are obtained and compared. It is found that the simply supported beam model has the largest deflection, the maximum deflection of the space grid model is slightly smaller than the three - span continuous beam model, the magnitude of the deflection value at the point of the moving load is significantly smaller than the three-span continuous beam model, but the deflection value fluctuates obviously.

The rocker arm lifting hydraulic system of shearer is analyzed. The simulation model is built through the software. The performance of rocker arm lifting circuit is studied by simulation, and the results show that the simulation model is reliable. The influence of the counterbalance valve on the pressure loss is analyzed.The results show that the reasonable selection of the counterbalance cartridge valve and its matching with the system can reduce the pressure loss of the system. The hydraulic system of the shearer rocker arm lifting can be further improved.

This paper introduces the design idea and scheme of a mine explosion-free lithium battery trackless rubber tire vehicle, and expatiates the overall structure and related technical characteristics of the vehicle. And it analyzes and introduces the key technologies such as chassis, drive system, electrical system, braking system and steering assist system. Through the specific tests and related tests, the car's technical indicators are to meet the national coal safety and explosion-proof certification requirements.

Abstract:From the two aspects of the sustainable development of China's coal economic demand and China's enterprises "going out" the exploitation of coal resource advantages discussed the implementation of “the Belt and Road" strategy can bring opportunities for China's coal industry transition and sustainable development.Confirming the amount of coal resources "the Belt and Road” along the country's total of 476.9 billion tons, accounting for 53.49% of the world's coal reserves.Besides, the coal is varied and industrial development in China the shortage of high-quality coking coal.Different economic corridor has the characteristics of coal resource, the scale and level of development are not the same.According to the characteristics of China's coal resource and coal industry system, combined with the coal resource distribution characteristics of “the Belt and Road” along the country's efficient, clean coal resource development quality abroad, effective export China’s the project of coal mining technology , equipment , service and management, through overall arrangement at home and abroad , the realization of China's coal industry in the collaborative development at home and abroad.