According to the diffrences from the " The GuoFa No.7 File of the State Council - The Mine Working Days", to discuss and suggest the raisonable coming problems for coal mine design.

In view of the problem of the pressure difference between the inner dumping and the repeat stripping in the adjacent open pit, the change trend of the boundary stripping ratio is analyzed. The judgment criterion of reasonable stripping ratio of the total pressure to the inner dumping is determined.Taken the Heidaigou and Haerwusu open-pit mine as an example, through the analysis the Heidaigou’ width of the triangle coal recovery should be 209.3m.

On the condition of coal seam groups mining with far distance, the research on pressure-relief study of overlying coal rock body using long distance lower protective seam mining applied the discrete element numerical analysis technology to monitor and analysis the coal seam pressure-relief effect. The NO.10 mine of PingDingShan TianAn Coal Co.Ltd was the background of the project. At the same time, the roadway deformation in the process of the protected coal seam roof alleys and coal pillar mining 248m apart from lower protective seam were calculated and analyzed. The result showed that, the distance between the mining face of the lower protective seam and upper rock roadway was 248 m, but the effect of mining was still significant, leading to the large deformation and subsidence of the alleys of overburden rock over a long distance and loss of function. This was consistent with the field observed situation. It showed that numerical simulation test and field test results were identical, and verified the reliability of the numerical experiments for pressure-relief effect; after the lower protective seam mining, the vertical stress of the protective seam 180m apart was reduced by 20%, the pressure-relief protection angle was about 80° and the inflation rate of pressure-relief expansion region was 2.25% ~ 2.25%. This showed that, mining protective coal seam beforehand had a obvious pressure-relief effect of overlying coal. So overlying coal can be protected.

For industrial production of mechanical and electrical equipment condition monitoring, on the basis of the theory of Internet architecture, Design a set of equipment running status parameters can be implemented in real-time collection, transmission, storage and management analysis of the mechanical and electrical equipment iot monitoring platform. Intelligent embedded terminal is developed by the method of ARM11 hardware environment and Linux System software environment, realize the data real-time acquisition and upload. Using Wi-Fi network to realize the coverage of network, the transmission and exchange of the data of system. The system application layer contains Web Service, database and System monitoring platform software, Implement the storage and analyzing of system data, and the Human–Computer Interaction of the system.

Study on the No.11 mining area’s conditions of ZhaoJiaZhai Mine , to research the reasonable width of coal pillar of the 11208 working face’s gob-side entry. The paper uses the theoretical calculation to determine the width of coal pillar, and the influence rule of coal mechanical parameter around the entry, the entry deformation and the plastic range are studied with different size of coal piller under the condition of before and after entry excavation by using the numerical simulation method. Based on site actual conditions,5m width of coal pillar is the reasonable width, and the entry stability is better. It provides an important basis for designing the width of coal pillar and inproving the working face production rate in the three-soft thick seam of fully mechanized working face.

Pointed for combined stability on soil-steep slope and culvert for high roadbed engineering, the displacement and stability on culvert are insured firstly, and then the occurrence on reducing displacement is implemented. It is not consistent with fact for slope to reinforce singly. The engineering instance of a roadbed slope is analyzed with the numerical calculation(finite different method) to obtain contour charts for displacement and plastic state, which include no reinforcement, diaphragm walls and prestressed anchors-diaphragm walls, respectively. The results show the displacement is significantly reduced with combined reinforcement than single reinforcing method. Simultaneously, the culvert has not been influenced without linking plastic state, which has been compared with roadbed and the reinforcing cost is the lowest, So such is that the combined measurement can direct complicated roadbed engineering among theory, design and construction.

Based on the engineering background of the excavation through DWF10 fault fracture zone of northwest upper-roadway for transportation, the paper synthesized numerical calculation and field industrial test to study the controlling technologies and countermeasures of roadway surrounding rock in fault fracture zone. The results of numerical calculation indicated that: (1)after roadway excavation, the roadway surrounding rock damaged rapidly along the fault; (2) Obviously asymmetric characteristics be fund in both the deformation of roadway surrounding rock and the plastic zone distribution, and the deformation of hanging wall side of roadway significantly less than which of footwall side, the amount of floor heave dramatically greater than that of floor sag, and the plastic zone of surrounding rock near the fault fracture zone is significantly larger than any other places; (3) Because the different weakening effects of fault fracture zone, the stress decreasing range is relatively big in terms of the hanging wall side of roadway and roadway floor. Then, the paper put forward the solutions of support——“high pre-stressed anchor and net support + u-shape steel support + concrete support” as the first support, and “pre-stressed anchor cable support + lagging grouting reinforcement” as the second support. The supporting effect indicated that the surrounding rock has been under control basically, that is mean that the roadway excavation in thin-coal seam close to big fault for decreasing coal reserves under the mining roadway and increasing coal recovery rate can be achieved.

During the construction of large diameter gas drainage hole, ventilation hole, cable hole, transporting material hole, relief hole projects in coal mining areas, because of their special nature, it requires hitting target precisely , so it should control the well trajectory of the pilot hole strictly to ensure hitting target precisely. In the case of the large diameter relief well in PingShang coal mine, it will introduce the pilot hole of large diameter well precise hitting target technology, which can serve as a successful case.

Abstract: In order to study the effect of high pressure jet grouting anchor rope application in the soft soil layer, combined with practical engineering, we has chosen three different length of jet grouting anchor cable and 1 common anchor cable tension anchor cable with long size on-site experiment, and analyzed the result of the test. The study found that high pressure jet grouting anchor cable has greatly increased the pulling force and resistance to deformation resistance of anchor cable. Test is of great realistic significance for the promotion of the anchor cable in engineering application.

First, according to the data of mineral pressure observation, this paper analyzes the characteristic of the initial support force, the working resistance, the late resistance etc. And find that the eigenvalue of hydraulic support is relatively small. The paper establishes the mechanical model of hydraulic support and the interaction model of support and roof, the analysis results of which show that the working condition of hydraulic support is related with special roof structure. The results show that during the normal stoping, due to the thickness of the quartz sandstone, the basic roof subsides hardly. Then the support bears the load of immediate roof approximately. During the periodic weighting, due to the thickness and hardness of basic roof and stuffed goaf, the given deformation of basic roof is small. It makes the ground pressure strength small.

In order to study the mining stress distribution regulation of the steep-inclined and extremely thick coal seam, use the FLAC3D numerical simulation software and the field measurement two methods to study the horizontal stress, vertical stress and shear stress distribution regulation of steep-inclined and extremely thick coal seam sectioned fully-mechanized top-coal caving in A dao-hai. According to the numerical simulation results, the influence scope of lead abutment pressure in working face is small while the side abutment pressure has a greater influence scope. Nearby the working face roadway show a obviously stress concentration phenomenon. The stress of the floor roadway is weaker than the roof roadway, but the floor roadway has a larger relative displacement than the floor roadway. The floor roadway’s deformation is mostly floor heave and roof subsidence while the roof roadway’s deformation is mostly global deformation. Measured data shows that mining of the upper slice has a strong influence in the lower slice in the steep-inclined and extremely thick coal seam sectioned fully-mechanized top-coal caving, the lead influence distance is 30m.

In order to make Liquid CO2 Phase Transition fracture technology economical and efficient in antireflection zone, the crack initiation process is analyzed, and the mechanical equation is established by gas mechanics and fracture mechanics in this paper. And calculate the radius of influence in the NO.13 coal mine is 8.2m, the calculated results are verified by the field tests on the same time. In this paper, the study of the technology lay the foundation of the research of mechanism of the increase of the mechanism, technology parameters and other aspects.

Work in the coal mine due to space constraints, large mixing and delivery device is difficult to work, so copying the existing wet spraying equipment on the ground to the coal mine does not work, and use a small mixing plant still requires a lot of manual operations , low productivity, poor stirring effect; at the same time, due to the gravel and cement are feeding together, stirring, even with a closed or semi-closed container for mixing, will generate a lot of dust, causing harm to the operator's body.In order to achieve concrete wet spraying in the coal mine, we propose a mixed wet spraying process, the article were analyzed and discussed for a variety of affecting factors of the mixed wet spraying process in the coal mine on practice, proposed to solve the problem of direction or method ,the results showing that these factors were controlled in the coal mine, or to take measures to meet the construction conditions, and achieving fine wet spray effect.

Based on mining upper seam of shallow buried ultra-close coal seam group with gully landform using interval mining method in Nanliang mine, this paper studies the effect of interval pillars remained in upper coal seams on stress distribution law of lower seams with the combining method of theoretical analysis and numerical simulation. The software RFPA was used to simulate upper seam mining and analyzed stress distribution law of elastic core of pillars in combination with theory of half infinite plane、lithology of roof and floor and mining technology parameters in workface. The stress distribution laws of interval pillars were analyzed. At the same time, the influence of the number of combined coal pillar on stress distribution is analyzed.

In order to study the variation characteristics of the gas permeability of raw coal sample in loading-unloading process and negative pressure, on the basis of the three axis seepage experiment instrument, a fluid-solid coupled triaxial stress seepage experimental device is developed. the experimental results show that: under same confining pressure, axial pressure and gas inlet pressure conditions, with the increase of loading negative pressure , the gas permeability of raw coal increased; confining pressure, pumping negative pressure and gas inlet pressure kept constant, the gas permeability increased with the increasing of axial compression, after the maximum, gas permeability reduced with the increase of axial pressure, axial pressure is unloaded to zero gas permeability increased gradually. However, It is difficult to restore the initial permeability, It may be related to the plastic deformation of coal; under high stress, improving the air inlet and outlet pressure to improve gas permeability has little effect.

By use of mercury intrusion test and low temperature nitrogen absorption test,the pore characteristic of six main seam’s coal samples from the major coal seamYV-1 well in the Yueliangtian mining area,western Guizhou were studied. The mercury injection test results showed that the pore volume and porosity of all the coal reservoirs are low. The pores are dominanted by adsorption pores, and as to the coal reservoirs in the block could have the micropores and transition pores developed, macropores well developed and mesopores most undeveloped double peak structural porosity features.The different types pore would have similar pore volume content and the mercury injection curves are similar for all coal samples.The seepage-flow pores are always characterized by certain connected and mainly open.The low temperature nitrogen adsorption experiment showed that the specific surface area of all the coal reservoirs are large which might be favorable to gas adsorption and accumulation.However,the adsorption pores are mostly comprised of one closed and airtight pores and ink bottle shape hole so that there are poor connections for adsorption pores,it might not be favorable to the desorption and development of the coalbed methane.

Based on TAW-3000 electrohydraulic serve rock triaxial test machine and Hot Disk Thermal Constants Analyser, the variational law of heat transfer coefficient of granite in 0 to 45Mpa was obtained through the uniaxial compression test. Experimental results reveal that the heat transfer coefficient increases in nonlinear with the increase of axial stress. In addition, the higher the specimen porosity, the more rapidly the heat transfer coefficient increases in the process of uniaxial stress increase, on the basis of theoretical analysis of experimental date, we create predictive model of stress-thermal conductivity relationship which considering the porosity of rock. The model is very feasibl and convenient for the prediction of heat transfer coefficient in a given range of stress

Abstract: In order to obtain rock acoustic emission time-energy parameters, uniaxial whole process loading experiment is used on rock sample based on the rock acoustic emission technology. Energy judging index K_SN is put forward to predict the failure time of rock sample. According to the experimental results, MATLAB is used to draw acoustic emission energy fitting line y_SN and the energy judging index K_SN is calculated. The results show that，with the load of rock sample, the trend of energy judging index K_SN is decreased compared with the previous period. As the lapse of time, the trend becomes more and more obvious. When the trend of energy judging index K_SN increased, the rebound phenomenon of energy fitting line y_SN appears. It foreshows that the failure of rock sample is coming soon. Analysis method of energy judging index K_SN can also be used to forecast earthquake and mine earthquake.

Coal unloading coal operations automation to improve the efficiency of coal production has important significance, but large capacity skip using curved rail unloading way exists large impact force, serious damage phenomenon, in order to solve this problem, this paper selects 50 tons of shaft large coal skip on curved rail automatic unloading, from the dump rail theory analysis of forecasting the loading and unloading time. To solve handling coordination problems and provide basis; and through design and adjustment of skip parameters, get the desired curve, to meet the coal unloading stress changes in demand.

In allusion to the requirement of low voltage DC power supply, which is used for LED illuminating in underground mine, a single-stage AC-DC rectifier is designed.The rectifier can achieve high power factor and galvanic isolation. This paper analysis the basic operation principle firstly, discusses the distortion of input current waveform when using the traditional unit power factor control strategy. Then, this paper proposes a novel control strategy eliminating the distortion of waveform. Finally, the validity of the proposed control strategy is verified through the simulation results and experimental results.

Common lithium battery capacity test methods have problems of low measuring precision, bad reliability, poor flexibility, the paper proposes a lithium battery capacity detection scheme with high accuracy based on internal resistance test method. In the paper, the relationship between lithium battery capacity and internal resistance is discussed, the estimation model of lithium battery charged state is established, and the hardware and software design of the system is completed. The system uses 4 wire AC inserting method to measure the intemal resistance of battery, and calculates the battery capacity according to the resistance. In addition, the system also achieves comprehensive testing and analysis of battery parameters, such as voltage, current, temperature.

Abstract: The microseismic monitoring instrument is often used in downhole where the working conditions is complicated including sand, rock, mud and other impurities. In order to increasing the moving accuracy of the pushing device, an adaptive control method based on Fuzzy PID is proposed in this paper. This algorithm can optimize the output scaling factor Online, improve the control quality of the system. The simulation analysis and research of the traditional and Fuzzy system are carried out by using the Simulink platform under the Matlab software. The results show that the Fuzzy system is stable, fast response, small overshoot. The pushing device of microseismic monitoring instrument can be better satisfied the requirements for controlling.

To investigate the influence of water-hardness on fie coal wetting properties, the qualities of different water were tested, the contact angle, zeta-potential and flotation rate of fine coal particle in different water were analized in detail. The results show that the hardness of cycling water samples are much higher than the new adding water of the same plant, and the water hardness have great influence on fine coal wetting contact angle and zeta-potential concerning to particle floatability. In the same water ,the coarser particles are more hydrophobic than the finer particles,while the zeta-potential of coarse particle is lower than that of fine particles. With the increasing of water hardness,the hydrophobicity of coal particles increase ,while the zeta-potential of particle decrease, the flotation rate increase, while the selectivity reduce.

Underground mining lead to ground subsidence, and make the landscape pattern change, Researching the landscape change rule in mining area have important practical value to know the impact that underground mining make on the ecotope. The landscape pattern of partial mining area in Yanzhou coalfield is analyzed quantitatively based on the Landsat TM images of Yanzhou coalfield in 1987、1995、2003、2010、2014, and get the landscape pattern variation tendency from 1987 to 2014.the landscape fragmentation increased after 2003, The major ways of landscape conversion types were farmland to unused land, residential land and waters, and unused land to residential land. Underground high intensity mining, reclamation and engineering construction is the major driving force. These conclusion have certain value to analyze the relationship between underground mining and land use.

Based on the Fully Mechanized equipment using experience and existing safety protection solution of Armored Face Conveyor, A Rock Block safety protection mechanism is developed. Both mechanical and hydraulic types are designed to meet different applicable conditions. Besides the function of Rock Block safety protection, it is easily for maintenance, the Safety condition of Coal Face workers is improved.

Abstract: This article introduces the overall structure of the variable frequency control system, the mechanical and electrical structure of the variable frequency motor, the software design of the system, and researches the function of the variable frequency control system and the parameter monitoring interface in the production process of the Plough in details. The design was used successfully under the coal mine and solved a lot of problems in the old machine,It is a domestic initiative.

Resource utilization is an important issue during the transition of resource-based towns, while suitable utilization of resources is regarded as the key for sustainable urban development. From the resource perspective of optimized integration and rational exploitation, this paper focus on the resource transition mode of Yexi. The types of utilizable resource is determined based on the resource potentiality evaluation. By utilizing the coupling and transforming relations among the resource subsystems, the system of collaborative development of resources is established. The results presented in this paper can be referred by further researches on the transition mode of resource-based towns.

southwestern Guizhou, Liupanshui, Bijie, the important coal production regions in Guizhou are selected as our research target regions. Trace elements were analyzed by using GGX-600 and ICAPQS-319. The results showed that: the concentration rates of Ga, Li, RexOy in the gangue have reached cut-off industrial grade; The Kang dian ancient land is the only terrigenous detrial material’s supply area in the late Permian, the concentration of trace elements in the gangue should be affected by the terrigenous detrital materials supply; volcanic ash deposition could be the reason of trace elements enrichment in the gangue; The Xingyi coalfield and Zhina coalfield in the area by Fractures control, is the area influenced by low temperature hydrothermal process, epigenetic hydrothermal fluids intrusion could be responsible for the abnormally enrichment of trace elements in the gangue.