For the case that section coal pillar width reach 30m in second panel of Tingnan coal mine, physical similar simulation experiment is applied to compare the difference of overburden strata migration when experimental area apply large pillar or narrow pillar. Simulation results show that if section coal pillar is large, the coal pillar will have a strong ability to support, the strata will behave violently, the height of fractured water-conducting zone will be higher and water-conducting fracture will be not easy to close. When coal pillar is narrow, it crushes immediately after the face pushed through a certain distance and integral subsidence of overlying strata also occur. The water-conducting fracture which has already formed easily closed. It helps regenerate aquifuge and will block the fractured water-conducting zone continue to grow. The height of fractured water-conducting zone will decrease too. It also effectively reduces the supporting pressure of coal pillar and slows down the threat of rock burst. By the supporting of section coal pillar, overlying strata appear distortion. Untill the narrow pillar crush will it weaken. This can reduce cracks expansion and damage of the overlying strata effectively.

According to the Huaibei Zhuxianzhuang Coal Mine 8 coal mining area II 5 conflict resolution requirements, using the ascending mining method that mining 10 . The numerical simulation indicates that mining-induced stress shell（MISS） is formed by high stress in surrounding rock above the working face. In the early mining period, stress shell formed a relatively complete and above the casing stress concentration degree is high. MISS gradually upward development with the working face advancing and height is about 111.4m. The shell and the shell based continuous dilution and tends to be steady. The low stress area in MISS becomes larger and larger under the protect of MISS with the effect of MISS, while the casing stress concentration degree subsides. THE numerical simulation and similarity simulation experiments show that the 8 coal roadway and the roadway floor shall be respectively arranged on the stress within the protective shell and 14m in floor of 8 coal where roadway surrounding rock here stress concentration degree is lowest, the damage is smallest and roadway most stable .

Combined with the geological conditions of thefourth mine of Pingdingshan Coal Group,reasonable position of roadway for lower ofultra-close coal seam is studied by numerical simulation in this paper.The results show that the deformation of surrounding rock of roadway decreases with the increase of the inner stagger distance under different layers. The reasonable inner stagger distance of roadway is 30 m.According tothe surrounding rock control countermeasures of actively division support，the paper proposes a division support scheme of combined support withbolt belt wire cable shedwith space of coal layers as indicators.The field practiceshows that combined supporthas well controlled the deformation of surrounding rock.

This paper aiming at the features of coal mine disaster that cataclysm fast, large destruction and easy cause secondary accident, analyses existing mine refuge facilities, point out the existence of self-rescuer effective rescue time is short, and lack of effective evacuation instructions before escape personnel entering asylum cavern. Put forward the new shelter facilities design based on the technology of IOT that include the perception, control and application. New shelter has the function of real-time guidance to avoid disaster, which can reduce accidents caused by lack of guidance, make for the deficiency of the traditional.

Abstract: The system structure of multiple devices cooperation work on mining and driving face was introduced. The single device electric control system design was explained. On the basis of the single device automation control, Information sharing and mutual control among multiple devices were realized by using wireless technology. Working principle of cooperation control network and the interface design between network and device were described. Application shows the cooperation control network that was realized by using wireless technology reduce the human factor, improve the system efficiency.

Numerical simulation on the vertical bearing capacity of single squeezed branch pile was studied, with MIDAS finite element analysis software applied. The orthogonal analysis between the diameter of branch and the distance of branch was done. The related changes were studied, and then the optimization analysis of squeezed branch pile was done. Simulation result shows that when the distances of branches are same, the bearing capacity of the piles increases first and then decreases with the diameter of branch increased. When the diameters of branches are small, the bearing capacity of the piles doesn't change obviously with the distances of branches changed. When the diameter of branch is a certain number, the bearing capacity of the most piles increases first and then decreases with the distances of branches increased. After the analysis, when the diameter of branch and the distance of branch are primarily selected, the diameter of branch can be preferred twice as the diameter of the pile, and the distance of branch can be preferred between twice and three times of the thickness of branch.

This paper gives a basic introduction on the unloading process of bottom dump hopper wagon. Combined with the design of coal unloading system with bottom dump hopper in the coal indirect liquefaction project of Ningxia Coal Industry Group, it concludes the design ideas of large-scale bottom dump hopper wagon unloading system and provides solid theoretical basis and practical reference for the similar designs in China.

In order to solve the large scale and deformation of the surrounding rock, a comprehensive reinforcement scheme with high pressure grouting and strong anchor cable is proposed. By mainly cement, chemical grouting is complementary way of composite grouting, used to improve the bearing capacity of the broken coal rock, and also the anchor of crushed rock can be significantly enhanced. On this basis, the use of strong cable to strengthen support is to prevent damage and to ensure long-term stability of the surrounding rock. Mine pressure monitoring shows that the two sides convergence of the roadway was within 254mm. The roof subsidence is controlled within 125mm, and safety control of roadway.

Based on two double coal streak which the distance between two layers is closer in the immediate roof of 4104 fully mechanized working face of Chuancaogedan Coal Mine, the section to expose roadway is too large and the two sides are weak, which result in the tri-layer composite rock plate and the cohesion between the tri-layer is almost zero. The threat of collapse and roof falling is so severe to the status of serious influence of the dynamic pressure. By the means of field evaluation and investigation of the same kind of mine, come to the conclusion of researching on bolt-mesh-anchor support technology by the means of numerical simulation, which will be used in the basic support on the coal face gateway, in the open-off cuts and in the equipment remove gateway. Research concludes that roof abscission layer indicator’s monitoring shows that the maximal displacement of 23.7 mm is 150m before stop line, the cost of maintenance and ending reduced 25%, the scheme has accomplished the ends with high efficient and and offered the referenced judgment of the engineering analogy.

Based on the problem of main haulage roadway deformation instability in Linglong gold mine, the FLAC3D numerical simulation software was used for roadway anchor reinforcement mechanism of the injection of nonlinear deformation damage and arch bridge of solid-liquid coupling simulation. The arch anchor reinforcement technique parameters and process was discusses. The reinforcement effect of roadway was analyzed in field. The research results show that the protection pillar stolen postharvest leads to a large area of roadway surrounding rock tensile and shear damage zone. Through the anchor reinforcement, area of roadway deformation and destruction of arch bridge in the rock formed a bridge bearing structure, improve the bearing capacity of surrounding rock, based on the analysis of the measured section of roadway convergence conditions, the reinforced deformation of each section observation values are smaller, maximum deformation of only 6.47 mm, reinforcement effect can meet the roadway transportation demands very good.

According to the serious influence of the dynamic mine strat pressure under concentrated coal pollar of gob in shallow seam longwall mining of shengdong mining area, Combined the example of No.31201 coal mining of Shigetai Mine,the paper analyzed mechanism of the accident,the rotary of gob bedrock by the instability of concentrated coal pollar,then the lower coal seam bedrock was destroyed, the dynamic mine strate pressure was casde by the impact load of the upper and lower bedrock. Adopting measures of blasting of coal pollar、shortening the length of face、yield mining and so on, and guided and validated by the microseismic monitoring、internal displacement monitoring and surface ground observation,through the measures to solve the problem of prevention of the dynamic mine strate pressure,to realize safe production.

Abstract： In order to prevent the occurrence of gas accidents caused by abnormal gas emission in the working face of coal mine, adopt the methods of gas geological analysis and GIS spatial analysis technology, to realize the dynamic analysis of mine gas geology, and by using predicted method by different gas source and combining dynamic information of gas drainage in working face to dynamically predict the amount of gas emission. Ultimately, based on system architecture design, using development platform of MapGIS and the key technology to achieve the visualization function, and got a successful application in LinHua coal mine.

Pumping test is one of the primary means of determining the hydrogeological parameters, and identifying the hydrogeological conditions. For the results that calculated in common pumping test is usually smaller than its truthful data, in weakly cemented sandstone aquifer in western China, this paper aiming at seeking the K parameter by the reverse-seeking method. According to the drawdown superposition principle and drawdown distribution principle, this paper makes use of drawdown-distribution-coefficient to calculate the K factor, in a group pumping wells test and without specially observation hole. Then compare the results with the parameter which is evaluated by the conventional method, and verify the result by the FEFLOW model. The results show that the parameter which is calculated by drawdown-distribution-coefficient can reflect the nature of the aquifer more better.

With the help of surveying robot Leica TM30, this paper calculates three-dimensional coordinates of the station sites and collects the data from the top and low layer monitoring points on the derrick based on the method of three-dimensional measurement on free station．After a rigorous adjustment, coordinates of each station site are calculated, so are the two-tier’s center coordinates of the derrick. And then the derrick inclination is calculated according to the two-tier center offset and the height difference between the two layers. The feasibility of this method has been verified by the monitoring data of the main shaft derrick in Tangkou mine．The experiments show that this method is better than the conventional one in its simple implementation and efficiency．

In order to study the explosive stress wave propagation in rock media, the single cylindrical cavity blasting was built using Finite Element Method (FEM), in which the ricker-like wavelet was used as the explosion source. The propagation characteristic of explosive stress wave, as well as the vibration features of the media was analyzed. The numerical result illustrates that the compressive wave (P wave) have a higher spread velocity in rock media compared with shear wave (S wave), which shows a slower attenuation. The vibration of the media presents a significant radial displacement at first, and then displays an obvious circumferential displacement. This means that the rock media around borehole may be crushed under high compressive stress, while radial tensile crack may arise with high circumferential displacement in the far field. The crack will present a fluctuation propagate under the mixed of the radial and circumferential vibration. In addition, this numerical method provide a useful way to reconstruction the explosive stress wave propagation process using ricker-like wavelet as explosion, which would have great significance in the study of explosive stress wave propagation and its interaction mechanism with rock media.

In order to study the influence of the ground movement deformation caused by the advancing speed of the working face, through the application of probability integral prediction model of mining subsidence which combined with the time influence function of Knothe, the ground movement deformation of speeds 5m/d and 2m/d were studied and analyzed under a certain geological mining condition. It is found that the dynamic peak of surface movement curve is inversely proportional to the advancing speed, which is to improve the advancing speed, which can reduce the surface damage, but cannot reduce the destruction of the surface of the first cut and the stop line. The results are important for the prevention and control of mining subsidence.

Based on engineering practice in 8101 working face of Selian first coal mine, caving forms of loose roof and rib falling forms of coal wall has been obtained by the field measurement, and the action mechanism of roof caving and rip falling has been analyzed, and loose roof plastic zone before and after rip falling of coal wall has been analyzed by numerical simulation, also about stress and roof convergence, and controlling principle and measures of loose roof caving and rip falling of coal wall has been proposed for field applications. Several conclusions were obtained: Firstly, empty-support distance of working face increased cause by rip falling of coal wall and abutment pressure increasing also extending to the deep of coal body, and that speed up caving of the loose roof. Secondly, the most empty-support distance of roof caving [a]≤1.64m has been obtained by theoretical analysis. Lastly, rip falling of coal wall compared with before it, there is tensile failure of roof in empty-support distance, limit-equilibrium realm of coal body and roof above hydraulic support decreased, roof vertical stress increased significantly after rip falling of coal wall and the maximum increase roof convergence is 0.5m. When rip of coal wall fall, it all increase about vertical stress, shear stress and roof convergence, and it falling more easily.

Abstract According to the movement and deformation of overlying strata caused by underground mining,the influence of roadway excavation retaining, underground pipeline operation and other practical problems. Negative exponential function is used to establish a subsidence prediction model within any estimated level in overlying strata, and compared with the results of numerical simulation, and with a example verification, have good consistency. Application of negative exponent method can accurately predict the movement and deformation of overlying strata, provides a reliable technical support for safe mining and mining under shallow buried Engineering.

The simulating test, using a large ratio(one sixtieth), was made to study the fully mechanized height face on the background of geological conditions of Wangzhuang coal mine 8101 face. In order to study neighboring pressure and the variation law of roof strata, large mining height fully-mechanized faces were separately pushed towards the fault that have different tendencies. The result showed that, when working face from hanging wall was close to the fault, it firstly formed advanced horizontal fractures which pitched in the fault in top rocks. What’s more, the roof under the horizontal fracture shifted much more vertically. When working face from foot wall was close to the fault, the roof along the fault plane appeared to be sinking as a whole and the support pressure was higher. After it passed the fault, the large scope of overlying rocks in gob sank unevenly and the closer working face was, the more deflection was. Pushing the working face would cause the terraced development of fissure zone of overlying rock. When the face was pushed from the foot wall to the fault, the height and the speed of fissure zone’s development were both higher and faster than those when was pushed from the hanging wall. According to the supporter pressure’s survey, the area of pressure increasing in fault zones played an important guiding significance for the working face’s timbering and reinforce.

Based on the rock movement data of two coal mines in the TengNan area, height observation data of water flowing fractured zone and borehole data of the working face, the paper analyses the relationship between the surface movement rule and the key strata under upper and lower No.3 coal seams situation. According to the analysis of key strata and the comparative study on the regularity rule of surface movement depend on the key strata buckling or not under repeating mining condition, adding verification of overburden rock damage by observing water flowing fractured zone height under different repeated mining conditions , the paper put forward that the change of repeating mining at short range will impact the regularity of surface movement. The results showed that surface movement won’t have significant change when repeating mining doesn’t destroy the key strata. 0therwise, surface movement will get intensified.

According to the anthrax characteristic of Yangquan 5th coal mine that the15# coal seam is inflammable and Spontaneous Combustion Period of the seam is short，the Spontaneous Combustion character and oxygen uptake process of coal were studied through the heating-programmed oxidation experiment. Inhibitory effect of different kinds of inhibitor on coal seam spontaneous combustion was studied during the experiment for which CO was selected as the index gas and also ICO was selected as the auxiliary index. The concentration ratio for the best inhibitory effect was determined as 30% calcium chloride, 15% magnesium chloride, 30% calcium hydroxide and 20% sodium silicate which could provide experimental basis for Spontaneous Combustion prevention.

In order to investigate the influence of fractal features on coalbed methane adsorption in middle-high rank coal samples (Vdaf < 25%), methane adsorption capacities of 6 coal samples from different mining areas were tested using high-pressure volumetric method. Langmuir equation was used to fit the experimental data and two parameters, Langmuir volume (VL) and Lanmuir pressure (PL), were obtained to characterize the adsorption capacity. Meanwhile, on the basis of scanning electron microscopy (SEM), the pore characterization on coal surface was analyzed. The fractal dimension of pore distribution (D) was calculated according to the Kolomogrov capacity dimension theory, and the effect of fractal dimension on methane adsorption was also analyzed. The results show that the pore structure significantly varies between coal samples, suggesting that the pore distribution on coal surface has obvious heterogeneity and fractal features. The fractal dimension (D) is greatly affected by metamorphism, and coalification makes pore structure complex. D values have different effects on VL and PL. VL has a linear increase with increasing D values. While, the relationship between PL and D values is characterized as a quadratic curve. The increase of complexity on coal surface benefits the methane adsorption.

With exploring the Yangguanzhai integrated exploration area and the analysis on the great borehole in formation, with the basic theory and method of the sedimentary、petrology and coalfield geology, the paper analyzed the sedimentary features、sedimentary sequences and sedimentary environment of the coal bearing strata in Weining county Yangguanzhai integrated exploration area., the paper had a study on the coal accumulation law,The results showed that the coal bearing strata of under segment Xuanwei formation in Yangguanzhai integrated exploration area is formed by meandering river flood basin sedimentary environment, the Characteristic of coal bed is lower continuity, small thickness, bifurcation, also ofen appeared pinch-out phenomenon; upper segment of Xuanwei formation is formed by meandering river and the bench sedimentary environment,the Characteristics of coal bed is good continuity, small thickness, good stability, simple structure of coal seam.

The exploration and exploitation of coalbed methane (CBM) have gradually turned into deep coal seams (beneath one thousand meters). Taking the southern Qinshui basin as the researching background, collecting shallow and deep coal samples and integrating with adsorption isothermal experiments, this paper analyzes and predicts the gas content of deep coal seams. The results show that: with the depth increases, the gas content first increase and then decrease; the gas content of No.15 coal seam is larger than No.3 coal seam. The predicted value of coal bed gas content of North Shizhuang district reaches maximum when the depth is between 900m and 1100m, and it is close to the measured value. In a word, the deep coal seam has a transition zone, the depth of this zone is between 600m and 1100m. And in this zone, the gas content changes. This is due to the reservoir stress and temperature, which changes the coal reservoir physical properties.

The flame-proof type switching compensation devices, such as static var generator, are growing rapidly for the improvement of underground micro-grid power quality. However, for the severe environment, the size of the switching compensator devices is limited. In this paper, in order to improving the responsible speed and compensation effect of switching compensator device, a new strategy for reference current calculation is present based on Conservative Power Theory. Through the orthogonal decomposition of the load current by the strategy, the reference current of various compensation objectives for switching compensation devices can be calculated by the current components or their combinations. It is demonstrated that this strategy can be used for various goals of flame-proof type switching compensation devices. The validity of the developed strategy is verified by the simulation results.

This paper proposed the application solutions of coal mine safety surveillance and activity recognition system based on video. The paper analyzed the practical requirement of coal mine safety surveillance, realized the functional modules for object detection, feature extraction, activity classification and activity identification, surveillance information management. By using GMM technology, the paper extract the moving target in foreground, applied LBP feature for object description and classified the activity with SVM. Based on Spring MVC, the paper implemented a complete framework of management system providing a solution for coal mine safety surveillance management information to improve the efficiency of the surveillance management. This management system could be used for timely discovery of coal mine safety emergencis and reduction the probability of occurrence of coal mine safety accidents.

Aim to reduce the computation of the classical SVPWM over-modulation algorithm for Inverter in Mine Designing，SVPWM Over-modulation using 60°coordinate Frame for Three-level Inverter is proposed in the text. Base on this the new way of over-modulation compare to classical methods is analyzed. At the same time , it is improved to simplify calculation.

This paper analyzes and summarizes the main problems of 3D coal preparation plant design, collaborative design and achievements protection. It describes the construction and application of virtual desktop cloud platform based on Coal Preparation Plant Design Virtual Desktop Cloud Platform, which is deployed in the Department of Mineral Processing Engineering (China University of Mining and Technology (Beijing)). The platform isn’t limited by time and space, and it not only can solve the problem of cooperative work and mobile office among the branches and the professionals, but shortens the coal preparation plant design cycle and improves the design quality. By using the multiple security policy, the design data is stored in the cloud platform securely, which can prevent the leakage of design result and protect the intellectual property right of the enterprises.

Activity for Binder flip-flow screen moving beam cross profile have a better satisfies to the requirement of actual working condition, this paper proposes a optimization design method based on ANSYS Workbench.Build the parameterized finite element model in the ANSYS Workbench software, applied to actual working condition, analysis the cross profile shape of the size parameters;Selection of bolt hole longitudinal and transverse distance and cross section and the foundation to optimize the parameters, the distance between the bolt hole position parameters and cross profile;Through the optimization module to activities outside the beam cross section optimization.The optimized activities meet the requirements of working condition of beam section, provides reference to the further optimization of the flip-flow screen.

In order to study the multifractal behavior during the formation process of ultra-clean coal flocculation through mechanical energy input,the images which describe the generation and fragmentation of flocculation are gathered and analysed. By analyzing the variation trend of the multifractal spectrum and its characteristic parameters, the growth law and the morphology of the flocculation are described.The results show that with growth and fragmentation of flocculation, the morphology of the multifractal spectrum occurs regularity migration, multifractal spectrum width △α which described the distribution uniformity of flocculation shows a trend of first increase and then decrease.The numerical value of △f(α) which described the proportional relationship between the maximum and minimum probability unit of flocculation shows the dominant position of fine particles in the system.The changing trend of absolute value of △f(α) indicates fine particle number and the growth of the flocculation change law.

In view of the modern coal winning machine CNC operation demand, brand construction,modeling design and the operating personnel to improve security requirement, this paper analyzed the characteristics of coal winning machine ergonomics form design, the shortage of the present situation and existence, and the principle of genetic algorithm and application scope. In discussing the characteristics of the human-computer interaction, the algorithm based on the basis of the proposed genetic algorithm was applied to product ergonomics form design the genetic code, the generation of initial population, fitness function of the structure and population selection method. Finally, in the design of the coal winning machine, for example, expounds the interactive genetic algorithm in product ergonomics form design application.

The paper investigates engagement contact forces of flight chain and chain wheel based on the characteristic of structure and drive of short-distance heavy duty scraper conveyor. The formulation of rotation angle, engagement force, and chain tensile force is established according to force equilibrium conditions of engaged chains of flight chain, which omits the influence of eccentricity, suspension tensile force, elastic distortion, design and manufacturing errors. Comparison of analysis results with above formulation between 9°,12°,15° pressure angle of 10 teeth chain wheel and 8 teeth, 10 teeth, 13 teeth with 12°pressure angle indicate that wheels have less pressure angle and teeth will gain larger tangential force and engagement force of single teeth, while demand higher material strength of chains and wheels. At last, simulation results of finite element method is carried out to verify the formulation results.

Multi-body dynamics simulation software Recurdyn is used on Coal Mine Drainage emergency vehicles to construct unilateral obstacle model. The model is used for unilateral obstacle simulation analysis. It is focuses on the effects of different barriers and different speed for independent crawler drive wheel torque. The simulation results show that: with the increase of barrier height and operating speed the driving wheel torque non-linear increases and not exceed the maximum torque of the critical design. Due to the different of rotational energy of independent track in instant obstacle, causing about driving wheel torque difference. Through this prototype simulation analysis provides a reliable basis for the actual vehicle safe and stable operation and further optimized.

Design phase is an important part of the reasonable and effective control of engineering cost, can save investment and improve the efficiency of investment, but the design phase of engineering cost management still exist many problems. Through the analysis of the design phase of engineering cost management present situation and the importance to take effective control measures, using the value engineering theory, quota design and optimization design. Analysis shows that the design stage is the important stage of engineering cost management and control, engineering design and cost personnel must carry on the solution of technical and economic analysis, optimization design, guarantee the technical and economic rationality of design, in order to obtain the optimum economic and social benefits.

This paper analyzes the Nolan model application in coal mine enterprise digital mine phase identification. According to the characteristics of coal enterprise information construction, it put forward phase cycle from infrastructure, business integration, information integration, modeling implementation of four aspects of the digital mine construction, designs the index system and evaluation standard of digital mine stage model, establishes the decision model based on BP neural network. The model is applied based on the actual case.