Due to the complex geological conditions of 11 mining area of full mechanized caving mining face in Wangwa coal, a reasonable section parameter of coal pillar can play an important role to guide the safety production. The measurement results of the stress and optical peephole device in the coal pillar indicates that 10 m ahead of the working face is the peak stress along the direction of coal pillar, the destroyed region of coal pillar is within 3 m along the direction of inclination, and the stress reaches the peak value around 6 m in the coal pillar. Further, the stress distribution rules of different size coal pillars are obtained by numerical simulation under the production condition here, revealing that the coal pillar gets some elastic region when the width of coal pillar increases to 26 m, with the increase of the width of coal pillar, the width of elastic region also increases, and that when the width of coal pillar increases to 29 m and 32 m, it has been able to guarantee the stability of coal pillar and the deformation of roadway is within the scope of the license. Based on the combination of field monitoring and numerical simulation，the reasonable size of the section coal pillar should be 30 m and the width of coal pillar is greatly reduced comparing with the previous pillar, which greatly improved the recovery rate of coal resources.

Aiming at the problem of reasonable scale design of strip mining in thick coal seam mining area in Western China in order to maintain the stability of surface structure,With abundant coal mine 12 mining area as engineering background,Using a combination of theoretical analysis,engineering analogy and field measurement methods, from the surface to allow deformation and stability of coal pillar, the recovery rate of the three aspects, and puts forward the research building (structure) design method of multi factor reasonable scale of mining under buildings。The results show that：According to the theoretical calculation, the best mining width of the twelve mining face is 60m, and the best coal pillar width is 60m, The movement and deformation caused by the mining scheme are small, which can ensure the safe use of the surface and increase the recovery rate. The research results in the abundance of 12 coal mining area the success of the layout of the 10 working face, the strip mining rate changed from 37.5% to 50%, the research has certain reference significance and application value of coal mining under similar conditions.

For better understanding and application of “Code for energy conservation design on open pit mine of coal industry” (GB51197-2016), which will be implemented from July 1st, 2017, explanations to the first edition of the code is wrote from the objective, significance, chapter construction, features, important clause analysis, code correct application, etc. The aim is to promote energy saving of the open pit mine, improve the energy efficiency, unify the design standard of the open pit mine in coal industry, increase the design level of the open pit mine and provide the understanding and implementation of the first edition of the code.

Abstract:According to the strong mechanical vibration source in the mine and the special environmental condition of inconvenient replacement of the power supply line, a self-powered underground temperature acquisition terminal node with long service life is designed. Power generation part of the use of magnetoelectric dual-mode power to collect energy together to achieve self-powered energy by the lithium battery added; chip LTC3331 energy management to achieve the entire system power to CC2530 8051 core for the control center, the temperature sensor DS18B20 control Terminal data acquisition and MAX17043 for power detection, and finally through the CC2530 RF module will send data to the host interface. Finally, the experimental results show that the designed structure is effective and the collected data truly reflect the ambient temperature. Improve the system monitoring the life and accuracy, can effectively prevent the occurrence of failure.

For providing reliable foundation with the nine coal ascending mining, raw coal properties were analyzed, in the Qidong coal preparation plant. This article shows that the nine coal ascending mining is 1/3 coking coal, which is a scarce coal. And it is fragile, difficult to choose, prone to mud. The technological process in coal preparation plant was analyzed, the author suggested that the increase in coal flotation process and flotation tail coal pressure filtration recovery processes, on the premise of no major renovation. Qidong well annual output of raw coal reached 2.4 million tons at the end of 2014.Coal preparation plant increased the income of 271.008 million yuan, after reforming technique.

With a comparison between the reinforced soil type retaining wall and counterfort type retaining wall plans for the coal receiving pit in Chang xu coal mine，a design plan with the counterfort type was determined. The counterfort type retaining wall was calculated with a software computation and manual recheck method in order to ensure a strictness and reliability of the computation and analysis results of the retaining wall. Thus the computation results could more rationally guide the structure design of the retaining wall.

Abstract: Aiming at problems about large deformation and failure of high stress and large deformation of soft rock roadway, the track downhill in 14 mining area of Hongling Mine in Henan province was taken as an example to study and analyze the deformation mechanism and rework control technology. Main deformation and failure forms of the downhill include roof subsidence even roof caving, two sides’ extrusion, spandrel, side wall brickwork fracture and floor heave. Results of experiment on physical and mechanical properties of surrounding rock and loose circles test show that surrounding rock contains many mudstone and sandy mudstone with low integral strength and formed larger loose circles. Based on classification method of surrounding rock loose circle and analysis of roadway’s supporting theory, the coupling support method with “anchor bolt (anchor cable) + U steel retractable support + anchor + grouting” was put forward to rework track downhill. Using numerical simulation of the support method, we analyze the stress distribution, displacement distribution and plastic zone distribution of surrounding rock. Filed test was carried out, and the application shows that roof and floor convergences of roadway was less than 121 mm after 100 days, sides convergences was less than 82 mm and late convergence rates was less than 1.0 mm/d, and the track downhill kept in a stable state.

For the problem of surrounding rock control with the increasing width. The No. 5203 railway roadway with large section(5.5×3.5m) of XIAO Jia wa coal mine was selected as the research object. Response of surrounding rock with increasing wdith was analyzed with FLAC3D. The results showed that: ①Plastic zone areas in roof ,floor and two sides are all distributed as “semi-ellipse”, increasing rate of plastic zone areas and depth with the width increasing: roof>two sides>floor; ②The displacement in roof,floor and two sides according to a index curve to depth. ③Displacement of in the same depth,surface and increasing amount: roof>two sides>floor; ④Abument pressure decreases with the increasing width in shallow part and the peak move into depth. Based on: ①Truss and Anchor Rope could be anchoraged in the shoulder stable region,could hold the roof,and the same time neutral axis move to the surface. ②The ability of bearing and preventing deformation by interaction space frame structure produced by truss and anchor rope combine cable. So,timely support technology of high strength and high pre-stressing bolt &net &truss cable was proposed. Engineering practice results: the deformation value of two sides was 97mm,the convergence value of roof and floor was 127mm and abscission layer value of roof was 3mm.

Basing on the effects of gob air leakage induced by the surface crack in shallow buried coal seam, and in view of coal spontaneous combustion prevention, taking the 10202working face of Ciyaogou coal mine as the research object, the air leakage characteristics of shallow buried working face was mastered by the tracer gas. By the comparative analysis of the air leakage after the implementation of plugging technology, the plugging effects were verified. The results shows that: 1) the air leakage zone from the intake airway to the position of 30m in dip leakage into the gob, after 30m in dip to return airway was leakage out the gob, and the surface air leakage channels are present;2) the volume of the air leakage was 161.2m3/min, the surface leakage air volume was 90m3/min;3) After implementing the plugging measures, into the leakage volume decreased to 76.1m3/min, the surface air leakage volume reduced to 24m3 /min. The total leakage air volume reduced 85.1m3/min after implementing the plugging measures, which show that the effects of plugging measures were more significant. Through the analysis of air leakage and its practice, the air leakage characteristics and plugging measures’ effects were identified, which had important practical significance to guide the mine fire prevention.

Abstract: The tailings of clean coal magnetic separation of Huipodi coal preparation plant was recycled directly as coarse coal slime with high ash content. The washability of primary slime coarse coal slime was Medium optional. And experimental studies of separation feasibility on three coarse coal slime separators were conducted. Experimental results indicated that slime dense medium cyclone and TBS had better separation performance. Combined with the characteristics of the equipment and the plants layout, TBS should be adopted in the reconstruction of coarse coal slime system. The sales revenue of coal preparation plant can significantly increase by estimation after transforming of coarse coal slime system.

In order to adapt to the changing situation of the coal market, the realization of -3mm following the depth of screening, improve the proportion of coal washing, optimize the structure of commercial coal, will Haerwusu coal preparation plant to carry out the research of banana screen transformation flipflow screen depth screening, and two sets of banana screen tested; test results show that the traditional banana screen will be transformed into relaxation the realization of 6mm depth screening, screening, increase the calorific value of commercial coal, improve the quality of coal production in 2; the current situation in the coal market, coal sales more space, to improve the economic efficiency of enterprises has obvious positive effect.

Pressurized pulverized coal pneumatic conveying system is one of the key units in dry feed entrained flow gasification facilities. Currently, many problems such as unsmooth discharge, equipment failures, fluctuate flow rate, etc. are found in the conveying system, and hampered the long-term stable operation of gasification facilities. This article summarized these problems and analyzed the factors which affect the stable operation of pulverized coal pneumatic conveying system. The Analysis shows that the main reasons are, poor quality of coal powders, inappropriate equipment sizes and the process parameters or control schemes need further optimization. Possible solutions are discussed, and it is recommended to incorporate latest research results in dense-phase pneumatic conveying system and conduct systematic experimental studies in a semi-industry test platform, through which to obtain the pressure drop distribution of pipelines and investigate the operation window and control know-hows, and finally improve the stability of pneumatic conveying system of dry feed coal gasification facilities.

In actual production application ,With the increase of the depth of the gas drainage hole, the cylinder storage capacity of the mine coiled tubing equipment is increased.If the flexible pipe can not be multilayer orderly arrangement,will influence on the length and the service life of the flexible pipe,make the injection operation of the flexible pipe becomes difficult. Aimed to solve the above problem,pipe arrangement device of mine coiled tubing equipment was proposed and designed.The working process of pipe arrangement device was introduced, a mechanical combined structure was designed. Application result shows that the flexible pipe can be multilayer orderly arrangement and the service life of flexible pipe is effectively improved.

The mechanical mining disturbance of coal rock changes the original stable state of the original rock. The stress concentration in the process of rock slope self adjustment is very easy to cause rock burst and bring great threat to mine safety production. This paper takes a coal mine project as an example, on the basis of laboratory routine test, the impact tendency of coal seam is determined. From the viewpoint of energy conversion, the equilibrium relation of work and energy increment is established the system of coal and rock fold catastrophe model of rock burst, and criteria for predicting rock burst occurrence are derived. The result shows that the coal mine has strong rock burst tendency, and when coal and rock system parameters K<1, rock burst will occur. Combined with the actual situation of the coal mine, measures for preventing rock burst are put forward.

In order to explore the evolution law of the movement and stress of the roadway and the overlying strata of the dense filling working face with the double edge of the goal，the stress of working face and the deformation of surrounding rock of filling mining were measured and analyzed . Research shows that: compared with caving method, advance support stress concentration coefficient and the influence scope was significantly reduced in filling mining, mine pressure appeared weak; filling body stress changes into the initial stress area, the stress increasing zone and stress stable zone, which correspondence with the the small deformation zone, the goaf roof movement violently deformation, and stability deformation zone of roof movement in goaf; the gob-side entry retaining deformation significantly, the deformation of the top floor is more than roadway's sides in the early stage, should strengthen the roof support, nearly the speed shift after the stability of surrounding rock is still greater than 2.4mm/d, the late need to strengthen the maintenance.

In the Libi block vertical well gas production is low, cannot satisfy the capacity construction mission, through analysis Libi block the geology, reservoir characteristics and its neighboring blocks of different types of discharge and mining data, it is recommended the L-type horizontal wells as production wells. The productivity prediction of L horizontal well was carried out by the correlation prediction software, The results showed that the L type horizontal well gas production is well, gas production is 3133.23~22499.7 m3/d, average gas production is 8415.35 m3/d, after the end of the production period, L type horizontal well cumulative production volume is 45.4 x 106 m3. The investment cost of the L horizontal well is ￥ 15.7 million more than that of the vertical well, but the cumulative gas production of the L type horizontal well is much higher than that of the straight well, the total income is larger, and the economic benefit is higher. The comparison indicates that L type horizontal wells average unit operation cost is lower than that of straight wells, a difference is ￥ 0.01/m. According to the relevant cash flow table to calculate the after tax financial evaluation indicators, investment L type horizontal well profitability is much stronger, investment recovery period is shorter, can achieve better economic benefits.

Shovel bucket design mainly uses the traditional mechanics calculation,the external force often applied by the distributed load , the digging resistance mainly adopts the digging resistance calculation formula . This method easily lead to bucket strength and structure design flaws. Taking the WK-20 excavator bucket as the research , using SolidWorks modeling the bucket, import the model to Hypermesh for pre-treatment, and then simulate the bucket mining process with the discrete element software edem, and get the external load which closer to the actual condition , combined with the finite element software Patran, the simulation results are applied to the bucket corresponding unit, By using the Nastran solver to get the stress nephogram and deformation of the bucket，provide reliable data for the structure design and optimization of the bucket, and also provide a good design and optimization scheme for other components and mechanicals.

The adsorption potential energy can quantitatively describe the relationship between the adsorption quantity and temperature and pressure. Therefore, based on the adsorption data at known temperature, the adsorption capacity under arbitrary temperature and pressure can be predicted. This provides a new way to predict the adsorption characteristics of reservoir under different depth and temperature pressure. In this paper, the methane adsorption curves are deduced by two different methods to test under adsorbed by non-coal and coal bearing clay minerals. The relations between the adsorption capacity under different temperature and pressure were obtained by fitting calculation. The results show that the adsorption potential for the samples in order are NH4-I> Kao-I >Ill>Phl. This result is in good agreement with the experiment results, and the method is feasible. It provides a method to predict the methane adsorption state under different temperature and pressure, and provide a basis for the exploration of gas adsorption in deep coal reservoir.

At present, some mines have laid out the 4G wireless communication network based on TD-LTE. Aiming at the shortcomings of the existing explosion-proof trackless vehicle monitoring instrument, the real-time monitoring system of underground explosion-proof vehicle running condition of TD-LTE technology was developed. The article describes in detail the advantages of applying TD-LTE technology wireless networks in mining vehicles and the principle structure and test of the system are introduced. The application results show that the system can stably transmit the data, video and voice of the underground vehicle, which can strengthen the trackless rubber tire operation of the supervision and scheduling to protect the auxiliary transport safety and improve transport efficiency.

The power flow in distribution network can be changed by the connection of DG, the current is no long a single direction. Aiming at the problems such as malfunction, refusal and sensitivity of detrimental effects on the distribution system of DG，the method of a communication-based adaptive current protection must be proposed. Using the combination of GOOSE over UDP with adaptive setting of current protection，this protection solves those problems of detrimental effects on the distribution system of DG.

In order to study the influence of inclination mining degree impacting on surface subsidence characteristics under the geological and mining conditions in thick unconsolidated layers, basing the surface movement observation data of four working face of Hongling Coal Mine area, the influence of mining degree impacting on the Surface subsidence rate, the tangent of main affecting angle and movement distance of inflection point was analyzed. It was concluded that under the condition of thick loose bed, with the increase of inclination mining degree, surface subsidence rate increases from 0.21 to 0.45, increasing nearly 114.3% when the inclination is shifting from very full mining to not a sufficient mining, and later, with the still increase of inclination mining degree ,the surface subsidence rate increase slowly ; with the increase of mining degree, the tangent of main affecting angle about the toward decreases more quickly than the tangent of main affecting angle about the inclination direction, and according the geological and mining conditions of Hongling Coal Mine, the experience formula between the mining degree of toward and the surface subsidence rate and the tangent of main affecting angle was fitted out respectively.

Investigation on Mine geological environment play an important role on the mine geological environment restoration and protection, and it is very common to explore the dynamic development, theoretical research and scientific and technological innovation. According to the investigation of the geological environment and the principle of ground penetrating radar (GPR),the paper systematically expounds the GPR exploration object in the investigation of mine geological environment, discusses in detail the measurement process and result interpretation of the GPR in the practical detection of the mine geological environment problems such as fault, karst cave, mine goaf and ground fissure, at last, it puts forward some technical conclusions and suggestions. The results show that based on the difference of electrical properties among the different objects in mine geological environment, it can realize the scientific explanation of mine geological environment problem acquiring the characteristic information of the target object by GPR.

In order to improve the hydrophobicity and the flotation effect of high-ash oxidized coal, adsorption and desorption of the Gemini surfactant onto high-ash oxidized coal were studied. FTIR and wettability heat measurement were used to study the differences between adsorption and desorption of the Gemini surfactant onto organic matters and minerals. The hydrophobicity and flotability of high-ash oxidized coal adsorbed Gemini surfactant effectively promoted with the surfactant concentration. Moreover, the ash of washed coal was increased due to adsorption of Gemini surfactant onto the minerals. The results of hydrothermal pretreatment show that desorption of the Gemini surfactant from organic matters and minerals is different. It was proved that the hydrothermal pretreatment before flotation operation lead to clean coal ash decreasing efficiently.

The condition monitoring and fault diagnosis of the hoist braking system in our country is studied. The research methods and achievements of different research institutes and enterprises are analyzed and summarized. There are still some defects such as the condition monitoring is not perfect, the ability of multi-fault diagnosis is incompetence, the overall evaluation ability of braking performance is not available. This paper could provide technical support for the health evaluation and intelligent maintenance system of the brake system, which integrates control functions of daily equipment management, on-line monitoring, fault simulation and intelligent maintenance.

In consideration of hydraulic automatic take-ups for belt conveyor’s various malfunction ,such as, high failure of hydraulic equipment, slow reaction rate ,etc，put forward a new kind of variable frequency automatic take-ups.The new kind take-up is only made up of electromechanical components, which greatly simplifies the system structure.Apply Space Vector Pulse Width Modulation technology (SVPWM) to Permanent Magnet Synchronous Motor (PMSM) speed control system,in order to control the winch’s speed and steering,then adjust the conveyor belt tension.Establish the system’s mathematical model and simulation model. Use AMESim and Matlab tool to make the simulation analysis on the dynamic characteristics of belt conveyor. The results show that the loose edge tension of driving drum remain at around 75kN in controlled start-up stage and around 52kN in stable operation and outage stage,which can adjust the belt tension timely and meet the need of various conditions of belt conveyors.

In recent years, environmental regulation policies have become increasingly strict. The study on the impact of environmental regulation on the coal industry has a great significance because the coal industry is one of the typical high-pollutionly industries. Based on the 2001 to 2016 panel data of coal Firms in China, this paper makes an empirical analysis of the impact of environmental regulation on the green technology innovation of coal industry. The results show that the environmental regulation has an incentive effect to the green technology innovation of coal industry and R&D, instead of the number of patent application.