Buried coal seam are discussed in combination with engineering example, a stripe type filling roadway width of coal pillar mining room is decorated in, coal pillar width between lane, lane number and isolation of coal pillar width of coal pillar between the interaction relationship between parameters, such as, calculate the lane between the safety coefficient and isolation of coal pillar width of coal pillar and safety factor; Analysis on the stability of mining interval above the pressure arch, it is concluded that the pressure arch arch and arch foot is the key to its stability, calculating the safety factor of arch and arch foot; According to the strip mining arrangement of production rate and filling rate is deduced formula, and calculate the 28 kinds of roadways and the layout of coal pillar mining rate and filling rate under different filling coefficient. Roadway width, in the end, according to lane between the coal pillar width and number of isolated coal pillar width, the stability of coal pillar, the pressure arch stability and production rate and filling rate of 28 kinds of parameters, such as arranging scheme comparison, recommend meet the reasonable scheme of suitability, stability and economy.

In order to ensure the safe production of Quan Dian coal mine, the MVDSS wind temperature prediction software is used to predict the wind temperature in different areas of Quan Dian coal mine. The results show that the wind temperature in the shallow and deep areas is relatively limited from 6 to 8 months. At the time of mining, the wind temperature is still overrun. The factors influencing the air temperature in different regions are analyzed. Finally, the influence of the thickness of the overburden layer on the temperature of the work site is higher than that of the ground temperature. The shallow area is non-mechanical Cooling can achieve good results, the deep area to take mechanical cooling measures.

Island mining working face has a relatively higher degree of stress concentration that lead to the difficulties of design of narrow coal pillar. The stress concentration of the surrounding rock of island mining workface in San Yuan Coal was analyzed. The mechanical model of main roof of the narrow coal pillar is established. The width of narrow coal pillar.was calculated. Based on the above results,the supporting schem was given and on-site verification was carried out.Results show that the design of narrow coal pillar and the support scheme were effectively in controlling the deformation of the roadway.

As one of the important strategic energy reserves and undertake area with the westward of China's coal region,Xinjiang is famous for its abundant coal reserves . In this new period of development age, coal industry in Xinjiang is full of opportunities and challenges. Based on the characteristics and distribution of the occurrence of coal resources in Xinjiang, including national policies, geopolitical advantages, technological innovation and speed advantages which stands for the advantage, analyzes a series of methods and advice with the core of the scientific exploitation such as strict controlling barriers to entry, increasing local personnel training, building coal transportation company and network marketing platform.Then,give some views about the development trend and prospects outlook.

Abstract:This paper maily introduces rules of partical size and ash of flotation materias,concludes distribution characteristic s in different tecnological process,and verifies that the partical size with obvious relationship to R-R formula is in accordance with the regulation of the equation.Therefore,prediction of productive rates of any partical sizes is feasible.

this paper, the application of BIM technology based on BIM technology and 3D collaborative design is introduced. Combined with the actual case introduced BIM technology in practical engineering application process and application effect, points out the development direction of application of BIM technology in coal industry design and problems, put forward BIM technology and resource strategy and design units to strengthen cooperation, sharing and win-win suggestions.

In order to solve the problem of surrounding rock stability and safety control in large-section roadway roof embedded high-stress weak intercalated seam, taking the 2302 return airway in Licun Mine as the project background, the deformation law in the return airway under different support parameters was studied by analyzing previous support problems and applying FLAC3D software. Meanwhile, support parameters in 2302 return airway were optimized, the technique of three-dimensional support structure combining with sidewall-roof-floor integrated control was proposed, and the scheme of roadway surrounding rock control in high-stress weak intercalated seam was presented. The application results show that during the process of mining, maximum roof subsidence, maximum two-sided displacement and maximum floor heave in 2302 return airway are 21.6cm, 35.6cm and 15.7cm respectively. The control scheme has a certain application value due to the fact that it can effectively solve the problem of roadway stability roof embedded high-stress weak intercalated seam.

Based on working surface stoping disturbance phenomenon of serious damage of Wangcun mine east wing seam mining area roadway group, the anchor - Spray - note integration strengthening surrounding rock structure, control of roadway surrounding rock stability control thinking, Anchor Jet Grouting in the surrounding rock of the tunnel formed the strength of structure mechanism based on and using COMSOL simulation study obtained with water to cement ratio is 1.5:1 superfine cement grout of roadway surrounding rock points level coupling grouting reinforcement. Field drilling peep and mine pressure observation results show that: the grouting effect is good, the tunnel stability after the two sides moving close to the amount of control over the 120mm, roof and floor shift in control in 90mm, the largest section convergence rate control in less than 5%. The research results provide a theoretical and guiding significance for the stability control of surrounding rock of coal roadway under severe mining disturbance.

Liu Yuanzi coal mine is a typical soft rock mine, the coal seam and its roof and floor have low strength, easily mudding and expanding when encounter water, soft roadway surrounding rock easily occur large deformation and serious failure under high stress. In order to control roadway surrounding rock’s intensive rheological phenomenon and ensure long-term stability, used field test ,numerical simulation, underground test and mine pressure observation method, proceeded a comprehensive analysis of characteristics and reasons of surrounding rock’s deformation and failure under original supporting method, putted forward "inner-outer compound bearing supporting technology and applied in soft rock roadway supporting. Mine pressure monitoring results show that after the application of this technology, bolt stress is stable, displacement of surrounding rock is small, there’s no obvious separation phenomenon, the surrounding rock stability is promoted，and providing reference for the management of soft rock roadway under the similar conditions.

The anchor grouting technique is a kind of sublimate of anchorage support,It makes the surrounding rock to form a wholethrough groutingand then to anchorage，It can improve the ability of resistance to deformation of surrounding rock,and solve the low roadway surrounding rock strength, breakage and the problem of large deformation.Taking a mine roadway in shanxi as an example, it was adopted in conjunction with anchoring and grouting support，Effectively solved the problem of roadway stability and deformation,It fully proved that the anchor grouting support is a roadway support technology which can control the deformation effectively, and has great potential.

Fully mechanized coal face are usually designed as the shape of rectangular rectangle ,and the drift and open-off cut are vertical which makes the resources behind the open-off cut can not be mined using the fully mechanized mining method. In order to avoid the waste of resources, to further improve the resource recovery rate and reduce production costs, we take the Slope adjustment design of open-off cut, to maximize the cutting edge of the rear corner of the comprehensive utilization of resources. Some special design should be used when designing the slope adjustment of open-off cut and some special Process should be taken to adjust the face the Beginning Mining of Fully Mechanized Working Face. In this paper, Open-off Cut Oblique Design and Process of Leveling at the Beginning Mining of Fully Mechanized Working Face is introductested.

Through coal mine measurement, the distribution of 401 mining area and 404 mining area ventilation resistance is calculated, and use the MATLAB software, combining theory of graph theory and fluid mechanics theory, the numerical simulation of ventilation system in the Xia Gou Coal Mine ventilation system is carried out. The calculation results show that 401 mining area total resistance is 1265.88 Pa, relative error is 4.8%, 404 mine area total resistance is 2537.38 Pa, relative error is 3.2%, the measurement result is correct， by comparing the simulation with the measured data, verified the numerical simulation results are correct, which can provide theoretical guidance for the Xia Gou Coal Mine safe production of the next ditch.

The traditional method of K1 determination which uses twist drill pipe mechanical sampling is greatly influenced by the residual powder of the hole wall and unable to accurately define the coal samples exposure time. This will lead to the problem that effectively prediction depth of outburst danger of mining face is shallow and reliability of deep hole prediction is low. To solve the above problem, reverse circulation sampling technique based on double-wall drill pipe is put forward for the determination of K1 value. This technique can make the hole drilling cuttings at the bottom be transported to the drilling external to achieve rapid, fixed-point sampling, so that it will avoid the problems existing in the traditional sampling method. K1 value determination test that uses reverse circulation sampling technique in Wu lan coal mine show that K1 values predicted depth can be up to 30 m, and is not affected by borehole inclination.

Floor water invasion has been one of the major types of water disasters in the process of coal mine production and construction, but it has an important technical way for water disaster prevention and control in coal seam floor by the use of borehole grouting. In view of the shortcomings of conventional borehole for water disaster prevention and control, this paper proposes a method of using directional borehole for water disaster prevention and control in coal seam floor, and the borehole design and borehole construction and borehole grouting technology are studied, and the complete technical system is summed up. The application results show that the design is reasonable, the drilling construction goes well, the grouting effect is remarkable in Henan Iiaozuo mining area. The water disaster from coal seam floor is prevented and controlled in advance through this technology, and it also plays an important reference for similar conditions of mine areas with water disaster prevention and control in coal seam floor.

In this paper, from the perspective of the reasonable recovery of mine water resources, comprehensive comparison of various processes and the advantages and disadvantages of the actual project as an example, analysis of underground purification system of mine water technology not only to avoid the mine water refer to inflow to the ground energy and pollution , And the study shows that solve the problem in undergrounding mine space to meet the national environmental requirements. Meantime , promotion the sustainable development of the use of this new technology in mine water field .

Rockburst was frequently occurred in the process of Wu Dong coal mine Southern mining horizontal section mining in steep inclined thick coal seam . Seismic CT detection showed that, the complicated structure of the overlying coal pillar is the main cause of stress concentration and even impact. For this reason, the two kinds of rockburst prevention measures were adopted in this area, such as coal injection and coal body pressure relief blasting, and the control effect was evaluated by using seismic CT detection. The evaluation results show that the coal water injection and pressure relief blasting can effectively reduce the stress concentration in the coal body, reduce the impact risk, and ensure the normal safe mining of the working face.

The gas overrunning occured usually in fully mechanized working face and upper corner, which has became one of the important reasons that affected mining normally. In illustrate to the geological features of roof rock and mining conditions in W1305 working face of Sihe Coal Mine, the coal seam mining numerical simulation model was established, and the position of high level long borehole and design scheme was determined through theoretical analysis and numerical simulation, the effect of coal seam mining on the gas drainage with the high level long borehole was analyzed. The application shown that the high level long borehole has obvious advantage: extending over long distances, covering a wide range, and can guarantee the drilling in the coal seam roof fracture zone extending, meanwhile, it can achieve continuous regional gas drainage. The single largest hole gas drainage flow over more than 30 m3/min and the gas concentration decreased significantly at the upper corner and the return airway during the period of working face cutting coal, so it has achieved excellent effect of gas extraction and governance.

To investigate the mechanics and hydrodynamics mechanism of the metal and double-antibody net for water and sand inrush under the caving zone, model test and penetration test has been combined in this paper. The steel model with 50 × 50 × 20cm has been designed to support the metal and double-antibody net to be conducted the pressurized test. The comparison penetration tests of four particle size sand have been conducted in this paper. It shows that the metal and double-antibody net can withstand great load without damage; the double-antibody net plays a great role to prevent the sand from subsurface erosion and block the sand collapsing inrush into the underground space. The permeability of four particles sands decreases after laying the double-antibody net, especially the small particle is more obvious, the decrease of permeability and the ratio of decrease when laying the double-antibody net at the bottom is bigger than it when laying the double-antibody net in the middle. The decrease of permeability when laying in the middle and at the bottom is the biggest in these tests, he decrease of permeability is bigger as the particle is smaller. The stable roof will be enhanced when laying the metal and double-antibody net in coal mining.

In Mine Surveying, through measurement it is an extremely important element, it is important to mine production whether the two Face position can transfixed in the design 。The method of Conventional error estimation only considers the error through an important direction, but it does not consider the vertical direction through error. In some large projects，it not only needs to consider penetrating through error important direction, but also the direction perpendicular to it through error s, then we need to consider the size of the position error through points. In this paper, a large Buddhist temple coal mine, making the error is expected when using condition adjustment model to study the conditions under the principle of least squares to meet, how to make the penetration point through points of error to a minimum, and is expected through error through points。

Grouting is the very important method in the jointed rock mass reinforcement of underground engineering and has a board application in mining engineering, slope treatment, chamber supporting and so on. The sandstone containing two coplanar fissures was taken as an example, which was firstly treated to filling reinforcement with different cement materials and then conducted to indoor uniaxial compression test, to study the strength and failure characteristic of sandstone under the effect of filling reinforcement. The test results show that, the strength of sandstone samples containing two coplanar fissures has obvious degradation compared with that of intact sample, and the degradation range is between 18.68% and 36.99%. With the increase of the strength of filling material, both peak strength and the average modulus of sandstone present the gradually increasing feature. Filling material has a great influence on the fracture form of sandstone. As the strength of filling material is relatively low, the failure process of sandstone mainly manifests as the crack propagation from the pre-fissure tip. While the strength of filling material is relatively high, the pre-fissure tip propagation is effectively suppressed, and the fracture surfaces are mostly characterized by the arrangement through the pre-fissures. The research results could provide some necessary theory basis for the supporting design and disaster prevention of jointed rock mass in underground engineering.

The research on the depth of destroyed floor in coal mining is important to the realization of coal mine safety and high efficiency mining. In view of the large error problems of single factor predicting the depth of destroyed floor, based on the open source data mining tool of Weka Platform and analyzing of the sample factors, and the data of destroyed floor depth was analyzed by using Bias Classifier, Support Vector Machine, Neural Network, Decision Tree and Random Forest Model. The comprehensive prediction of destroyed floor depth was completed from the perspective of multiple factors. The application results show that the length of working face and mining depth were the main influencing factors on destroyed floor depth; The node error rate of the Neural Network Model was the lowest, and the node error rate of the Decision Tree Model is the best; The accuracy rate of Neural Networks and Random Forests is 95% in detail; With overall analysis, the forecasting effect of Neural Network Model was optimal, and it achieved better prediction of destroyed floor depth.

Based on the field test of geometric sizes and assessment of structural properties for supporting system with rectangular section, used for the conveyor of fully mechanized coal face at a simulated crossheading, as some structural diseases occurred after its construction, the calculating models according to finite element method are established and the numerical results are obtained, the survey conclusions drawn from the spot are verified also, finally the strengthening technical solution for the supporting system is presented, which can be referenced by the practice.

In order to investigate the influence of surface circumferential crack on the performance of mine drilling rods, the problem was analyzed using linear elastic fracture mechanics. Static torsion tests were carried out for 9 mine drilling rods, and the cracks under different levels of lengths and depths were put on the surface of drilling rods in advance. The torque values of crack propagation and crack growth angle were obtained. The test results indicate that the crack is difficult to propagate when the size of crack is too small (length 10 mm, depth 2.5 mm); the values of the crack growth angle are about 10°, it increases with the increase of the crack depth; when the length (depth) of the crack is relatively large, the torque values of crack propagation decrease sharply with increase of the crack depth (length). Finally, the stress distribution before the crack propagation was obtained using finite element modelling method. The values of the stress decrease almost linearly on both sides of the crack from outside to inside. The stress curves of inside and outside round edges of the crack are all similar to parabola shape, but they are in the opposite direction. When the length of the crack is small (10 mm, 20 mm), the maximum stress is in the surface tip of the crack. The maximum stress of the inside round edge is in the middle of the edge, and the value is smaller than it in the surface tip of the crack. When the length of the crack is relatively large (30 mm), the value of the maximum stress of inside round edge is larger than it in the surface tip of the crack, which suggests that the crack will propagate from inside round edge possibly. The results obtained in this study have an important guiding significance for drilling rods design and the accident treatment in the drill site.

Abstract: The essential problem of the low power consumption in shearer study is the efficiency of height-adjusting hydraulics system. In this paper, a method of variable displacement pump with height-adjusting hydraulics system of shearer has been proposed. Based on the theoretically analyze its operation principles and efficiency, by using simulation tool Simhydraulics in Matlab, it builds up a model of load sensitive variable displacement pump with height-adjusting hydraulics system. The results of simulation show that the efficiency of load sensitive variable displacement pump with height-adjusting hydraulics system is far outclass that of fixed displacement pump on the premise that shear dynamic performance is constant, through the comparison of the efficiency of load sensitive variable displacement with height-adjusting hydraulics system and that of conventional technological fixed displacement pump.

Rural urbanization is an inevitable choice for urban and rural development of resource-based regions, it is an impor- tant measure to promote the integration of urban and rural development of resource-based regions, the optimization and adjust- ment of industrial structure and spatial layout is an important security for the development of urban and rural economy and the promotion of rural urbanization. On the basis of expounding the relationship between industrial development and rural urbanize- tion, and the choice of industrial development path in the process of rural urbanization, the paper takes Wuan area as an example to introduce the development of urbanization in the region and analyze the characteristics of industry development, from two aspects of industrial structure and industrial space, the paper puts forward the countermeasures of optimizing the industry layout.

Nozzle is the main actuator of high pressure water jet system. By taking conical convergent nozzle used for descaling in mine main drainage pipelines as the research object, the fluid field of internal nozzle is simulated by Fluent software. Results of axial pressure，turbulent kinematic energy and velocity are obtained by simulation. Through analysis of the results, the optimum parameters of nozzle are verified. The results show that the contraction angle that is between 〖10〗^° and 〖20〗^° and the length﹣diameter aspect ratio that is equal to 2 are the best matching parameters. Nozzle which is designed on the basis of the optimum parameters has stable pressure gradient, the optimal jet velocity gradient and stability of fluid flow. The simulation results provide a theoretical basis for the structrual design of jet descaling nozzle.

In recent years, coal-bed methane drainage technology by ground drilling in coal mining area in China has developed rapidly, in horizontal wells drilling and fracturing, well layout optimization of vertical well and "L" type well in mining area, well body structure optimization and casing protection, evaluation of coal-bed methane resources and well drilling technology in gob, drilling process optimization, safety monitoring of negative pressure drainage and other aspects have a significant technological breakthrough. The extraction technology by ground drilling is developed from a single pre extraction to a comprehensive extraction stage; include pre-drainage, pressure relief drainage and drainage in gob. In our country, the proportion of coal bed methane drainage by ground well in the total extraction volume is increased from 14% in 2009 to 24% in 2015, which increased by 17%. Finally put forward the establishment of fine geological guidance model, fracture mechanism and fracture extension mechanism in soft coal seam, real time monitoring of fracturing fracture, field observation technology in underground coal mine ,safety evaluation and resource evaluation of drainage in gob, is still the main problems and key research directions of surface drilling extraction

D-InSAR (Differential Synthetic Aperture Radar interferometry) technology is available day and night. It can provide high-resolution images and realize continuous spatial coverage. Based on two-track differential interferometric, this paper analyses 7 scenes TerraSAR-X to get the D-InSAR data of surface subsidence of a mine in Shandong province, and then compares with the leveling data. On account of the differential value between the D-InSAR data and leveling data and the distances, this paper obtains the modified formula of D-InSAR data using the least-square polynomial fitting method. And after the modification, the accuracy of the D-InSAR data meets the requirements of surface deformation monitoring, which holds broad application foreground.

According to the diffraction pattern of coal, the conventional method judging coalification degree is to calculate the ratio of the 002 peak height and FWHM. In this paper, the diffraction patterns of nine kinds of coal were sorted out and calculated. The results show that this method is more reliable for the judgment of medium and low metamorphic grade coal, but it is lacking for high rank coal. In addition, the low-angle region (3-10°) of the diffraction pattern of coal, which is calculated by Bragg equation, reflects the micropore information in the coal with a diameter of (0.884-2.94) nm, and its diffraction intensity corresponds to the porosity in coal. Therefore, the function of the coalification degree is defined according to the regulation of porosity variation with the coalification degree. It can be integrated coal information in the low-angle diffraction patterns and 002 peak to determine the degree of coalification. It is proved that this function is more feasible, reliable and accurate for characterization of coalification degree.

For the problem of speed instability of chock carrier overloaded downhill under coal mine, this paper introduced chock carrier hydraulic system operating principle, analyzes the chock carrier overloaded the main reason for instability downhill speed, design problems chock carrier hydraulic system buffer means to solve the chock carrier overloaded unstable downhill speed protect the hydraulic system and the protection of the individual hydraulic components of the engine to improve the life of the various elements; optimized chock carrier hydraulic drive system, improve chock carrier performance, and is to provide a reference for the same vehicle traveling hydraulic system designed.

With the application and promotion of drill pipe screen insertion technology, the normal four-winged on-off PDC drill bit has the disadvantages of low drilling efficiency in through beds hole section, and the center blade can't open properly because of its distortion. In order to solve this problem, a new three-winged on-off PDC bit was designed, and the field test was carried out in Zhu ji dong coal mine of Huainan Ming Group, the average drilling footage was 590.7m, the average life expectancy increased by 68.8%; the average drilling efficiency in through beds hole sandstone section increased by 33%, and the success rate of casing job reached up to 100%.

The preparation of a mine production continued plan is an important work of the mine production management and the core content. In the development engineering work, by using the theory and methods of operations research,we studied the simple and complex network of the development engineering, besides established the network diagram and digital model, finally development a visual network system through Java language,which can be using to get the methods of the development replacement.Combined with the actual project data of the FengHuangTai Mine,the result of the network system can be applied to the mines,which got praise.

The?problem?caused?by??coal?exploitation?has?become?more?and?more??serious?along?with?the?development?of?coal?Industry. The key reason is the larger negative externalities, and how to measure is the basic but difficult matter to improve the price and compensation system.According to this,the article puts forward the measurement model systematically from four aspects including resource depletion cost, environmental cost, ecological cost　and safety and negative externality cost , and calculates the negative externality cost of this mine and using the real data of a mine in Shanxi to verify .

Abstract: With the reorganization of coal enterprises, it has established the industry dominant position. In the influence of the energy revolution and economic new normal, to adapt to the new changes in the economic environment, to meet the needs of the survival and development of enterprises, strategic cost management has been accepted and implemented. This essay overview the coal enterprise group strategic cost management, including strategic positioning, value chain analysis, cost driver analysis.