To guarantee the safety of working face during stop mining period, field observations of the support resistances were taken in the first working face of Wangjialing Coal Co., Ltd. By analyzing the data from pressure gauges and digital displays, support resistances behaviors of fully mechanized top-coal caving working face with high mining height during stop mining period were obtained. The results show that strata pressure along the working face direction had a wave properties, the support resistances would increase with an interval of 20~30 supports. As for the support resistances for each support themselves, it would be a stable range during the stop mining time. The support resistances distribution for both the front and back abut in the working face during stop mining period was similar to that of the mining condition, and the highest resistance was smaller than that of the mining condition. During the stop mining period, resistances of both the front abut and the back abut had an increasing tendency. In general, the real time front resistance was smaller than the setting load, while the back one was higher than the setting load, so the back resistance was higher than the front one.

According to the occurrence and engineering geological conditions of 1921 working face in steeply inclined thin coal seam in Zhaojiaba Coal Mine, to study on the law of roof stress and deformation in steeply inclined thin seam by using the theoretical analysis, numerical simulation and filed measurement. The results show that the steeply inclined thin coal seam roof stress has obvious regional characteristics; the roof of solid coal at the ends of working face is the increased stress area, the roof above the working face is the decreased stress area, and the area shows asymmetric flat arch distribution; the advanced support pressure in different position of working face is different, the middle of working face is significantly greater than that of upper and lower; the stress concentration factor for the advanced support pressure is approximately parabolic growth with the advancing distance, When the advancing distance is 50m, the stress concentration factor remained basically unchanged; the subsidence curve of roof showed asymmetric gourd shaped distribution obviously, the upper roof subsidence of working face is maximum. Research results conform to actual roof deformation.

Western China to study thick loess cover layer of collapsible loess mining impact on mining subsidence, the paper through the loess layer of wet mining subsidence mechanism to study the establishment of a mining collapsible loess layer of surface subsidence caused by the calculation model, and the results apply to mining B40301 Binchang Face validated analysis. The results show that: the wet surface subsidence collapsible loess layer not only directly affected by mining also involves additional working surface deformation produced in collapsible loess; additional surface subsidence value derived from mining caused collapsible loess layer; through field investigation, model estimates and the actual match face to verify the article derive additional surface subsidence value calculation model of collapsible loess layer cause is feasible and practical.

Abstract: According to the coal seam condations and the overlying strata mechanical properties of Longwanggou coal mine, For researching the impact of working resistance at the process of caving the extra 6 thick seam face under the condition of overlying 6 seam with close distance had been caved, the physical simulation experiment was carried out. Studies suggest that the extra thick seam of fully mechanized caving face which under the mining goaf with close distance in the mining process, the strong pressure occurred at high frequencies, the working resistance over simulate bracket range to above 24000kN and up to 82952kN when each cycles occurred after second periodic weighting; the working face, the upper bracket coal and coal wall were damaged hardly;Stent overload and pressed frame occured frequently, which seriously affected the normal production of the face, so the research suggest it is not available that caving a full thickness 6 seam of 21 m under mining goaf after caving mining method in overlying 6 seam.

In order to study the law of roadway roof separation, established a mechanical model which considered anchorage effect and horizontal stress based on Time Series Analysis theory of roof separation value and the Elastic Theory of Beams. Besides, we used Maple and SAS to analysis this problem. Based on the mechanical model, we put forward a method to determine the value of elasticity ωmax and the value of instability δmax. we could get the optimal supporting time and judge roof fall by three values, which are the predicted value Xt and the two separation values ωmax and δmax. In addition, we discussed the mechanical mechanism of surrounding rock instability by the mechanical model. Finally, we used an engineering example Dong Tan Mine 1035 roadway as an example of the model. Conclusion are drawn that the value of separation ωmax and δmax are 16mm and 35mm, and measures should be made when the value of separation reached 35mm.

In order to solve the force and slip on pipe laying which laid in large slope roadway, the force model on pipe laying is established and simplified, and the force analysis and calculation method are discussed. Then the force and slip on pipe laying are analyzed, which laid in certain roadway with varied slope at Liudian mine; The control measures on pipe slide are proposed, the reliability of pipe installation is improved.

In order to understand the hydrogeological classification of coal mines in North China and the current situation of water hazards, data were collected, i.e., the number of coal mines, mine water inflow, water discharge, water content coefficient, the hydrogeological classification, and the level of effort in preventing and controlling the water hazards. The situation and characteristics of the hydrogeological classification in North China’s coal mines were studied statistically. There are 41 extremely complex coal mines, 299 complex coal mines, 1585 medium coal mines and 964 simple coal mines. Analysis of the 2012 and 2013 water hazard accidents in North China’s coal mines indicates the water hazards often occurred in state-owned mines and were mostly caused by goaf water. The effort will help the future job in water prospecting and dewatering and ascertain the important areas for preventing and controlling of water inrushes.

Compared with the traditional Power Transformer, the power electronic transformer has many advantages. it has a good application prospect. Firstly, this article shows the configurations and the main functions of the three-stage circuit in the single-phase Power Electronic Transformer. Then, this paper analyzes the working principle of the rectifier stage, the isolation stage and the inverter stage. At the same time, this paper selects the appropriate control strategy and designs the digital control system with the DSP. This paper designs and builds the main circuit, the detection circuit and the driving circuit, and builds the experimental platform of the single-phase Power Electronic Transformer, then it gives the experiment waveforms to show the validity of the design.

Designing solutions in the silo quantitative automatic loading system, aiming at the improper selection of feeding valve closing time, There is contradiction between the precision and the efficiency in loading system.The system makes use of fuzzy control technology,on the statistics of the field measurement data and combined with operator experience into the control rules, making up fuzzy sets and fuzzy logic. Creating a friendly human-computer interaction (HCI) can reduce the operator's workload, improving the control precision and the efficiency of loading to achieve optimal fastest control.

Introduces the explosion-proof electric proportional control system general scheme of the coal mine hydraulic driving vehicle and the explosion-proof treatment measures of it's hardware system; By the explosion proof electric proportional pressure reducing valve output characteristics test, researches the linear function between the control voltage and the output pressure；Through the explosion-proof electric control pump characteristics test, researches the pump characteristics and the linear relationship between the maximum torque and the servo pressure; According to the engine characteristic curve，researches the matching of engine and explosion-proof electric control pump, sets reasonable goal load value, puts forward the closed pump displacement control strategy based on the function relationship between the rotational speed and voltage control , and develop the electric proportional displacement control program based on the PLUS+1 GUIDE; A hydraulic support vehicle using the explosion-proof electric proportional control system, obtained the power and emission performance better than those applied the mechanical hydraulic servo control.

In order to solve the distributed and hard to maintain problems of Jin Jiazhuang coal mine equipments, its equipments management system was studied based on the manufacture execute system. Equipment management system data was divided into static and dynamic categories, and a data model was made to build the system functional architecture through the data flow diagram. Equipment management system has been designed using the Oracle database, and system interface was written by Visual Studio software. Equipment management functions were realized for Jin Jiazhuang coal mine, and improved the efficiency of production.

For the technical problems of coal and rock character recognition in fully mechanized caving faces. A method on characterization and recognition of coal and rock traits were discussed based on the time domain indexes of acoustic pressure data according to the differences of physics and mechanical parameters of coal and rock ,and the differences of acoustic pressure data when coal and rock falling impact the rear beam of the sublevel caving hydraulic support. Firstly, the top coal caving experiments were carried out with mining portable vibration recorder developed by China University of Mining and Technology(Beijing)in fully mechanized caving faces in the underground mines, and the acoustic pressure data in quantity were acquired; Then, signal preprocessing were carried on to remove trend items for the selected sound pressure data ; Finally, the acoustic pressure dates were analyzed in time domain and the time domain features were acquired. Comparison found, peak to peak, variance and kurtosis index are sensitive to the working conditions and the variance with a higher recognition rate. Accordingly proposed an analytical method that based on time-domain features of sound pressure date which used variance as recognition indicator, providing technical support for improving the caving automation and intelligent in the fully mechanized caving face.

The fluidization of coal gangue particle on cold model is tested in plexiglass of diameter 140mm and height 1344mm. The fluidization characteristic of coal gangue particle and the effect of distributor, bed thickness on fluidization quality are analyzed. The results show that the opening ratio of distributor and bed thickness do not much affect initial fluidizing characteristic of coal gangue. Two types of coal gangue particle are B particle and the initial fluidizing gas velocity are 0.16m/s and 0.14m/s. The Babu formula can predict initial fluidizing gas velocity of coal gangue. The distributor, bed thickness and particle will affect fluidization quality by different level. The suitable operation velocity is 1.5 time than initial fluidizing gas velocity.

Aiming at the roadway characteristic of large buried depth and high ground stress in xin zhuang mine, the concept of anchor supporting and grouting reinforcement of surrounding rock of roadway was put forward and the FLAC3D numerical simulation was used to study the influence factors of roadway stability in three different supporting form in the article. The results show that the weak link with high ground stress should be avoided in the process of roadway support. With the increase of floor support strength, the shallow surrounding rock stress distribution of roadway is more uniform, the stress concentration phenomenon in roadway's two angle is weaker, the ability of transferring surrounding rock stress of roadway floor from the deep to the shallow is lower. The supporting form of anchor beam and grouting reinforcement not only effectively reduces amount of floor heave but also solves the problems of roadway collapse and roof caving very well. The results show that the deformation of roof and floor reduces 85.5% and 92.7% respectively in the field and the supporting form has obvious feasibility and superiority.

Based on the Chen Silou mine 16 mining auxiliary lane tunneling along the fault, and soft coal roadway roof and broken, can't normal construction of tunneling technology and supporting plan, after searching technology innovation, short dig short branch technology from practice, optimizing the construction organization, eliminate the safety hidden trouble,Through the observation of roof abscission layer, effect is remarkable. For soft and broken coal seam of the mine roadway excavation and supporting provides a new train of thought.

This paper expounds the soft coal roadway in soft coal seam and the basic concept of plateau environment and the characteristics of the deformation of supporting scheme. The Jiangcang mine four mine 2013 working face in soft seam track trough as the researches on the supporting scheme of object, research and field tests on 3 different support way of. The anchor net +U type roof support, Bolt Mesh Cable + T strip, advance + anchor grouting Cable + T steel. Through the comprehensive mine pressure observation results show that: Advanced + anchor grouting cable tunnel support + T type steel most suitable for plateau soft coal seam.

During research this paper took cut open-off of 8206 fully mechanized face in southern 402 mining area of Jinhuagong Coal mine as object, analyzed failure feature of coal and rock and then put forward three main control index of surrounding rock stability consists of roof separation ration, loose coefficient of surrounding rock and development degree of fractures in surrounding rock. Then, we classified the control index of surrounding rock stability and based on this classification, the support difficulty is further dived into six grades by combining with roof property and actual support characteristics of surrounding rock. At last, by mans of calculation and classification table, support difficulty of 8206 cut open-off was determined as second grade, ie, hard to support. With the determination of its support difficulty, the cut open-off was applied to “trinity” comprehensive support system of which the control approach and acting mechanism were illustrated. Application of “trinity” system proved obvious control effort of the system. Meanwhile, the support concept and system provides some preference for cut open-off with similar conditions.

Directional drilling technique and equipment, as a kind of most advanced technique in the field of underground drilling in coal mine in recent years, has played a more and more important role in gas control of coal mine. But after researching, we know that the structural characteristics of this technique and equipment determine more effective in stable formation, and less effective in complex formation. Therefore, using directional drilling technique construction in complex formation (soft seam, structural belt), how about the drilling risk and what about the application prospect of this technology, has still no systemic research conclusion.So the author tracks the application test using ZYWL-6000D Directional drill in Gaohe coal mine. The test completed five boreholes. Most of their main holes’ depths are above 480m, and the No.4 main hole’s depth is 561m. According to the test results, for Gaohe coal mine with soft coal (f<0.45) and complex geological structure formation, although drilling is difficult and there are more unexpected situations, we can also adopt directional long drilling if choosing proper construction technology. From this, for complex formation of coal mine, directional drilling technology and equipment has a good application prospect. And It has important significance for gas control in coal seam.

Abstract:liziya South Second mine first mining face inclination is 48°,soft roof and floor rock,coal has outburst,fast, how to cutting through fast a safe and economical open cut，control a good roof is a major problem.After many discussions,uses the anti-well drill through the construction,using limit equilibrium method for support designing.Mine pressure monitoring results show that the construction technology and support is feasible,the construction can be realized quickly and safely, and the open cut distortion has been effectively controlled.

Based on the large dip angle, large span cutting intraocular bracket upwards from the bottom of the transverse installation technology research. Summary of safe and efficient fast support installation technology, shorten the construction period, improve the work efficiency, and further improve the high dip angle fully mechanized production technology management.

The water filling source is the sandstone aquifer on the roof in the mining face in muduchaideng coal mine which is analyzed in this paper. The permeability coefficient is obtained by the underground dewatering test. On this basis, the drainage water yield in the first mining face is calculated by the principle of superposition of the interference well group. According to the result, the final arrangement of the the roof water drainage drilling field is determined. It provides a new way of calculating the drainage water yield in the first mining face and a valuable reference value for calculating the drainage water yield of the surrounding mine.

Water-rich sand stratum is often encountered in tunnel construction,due to poor level of cemented sand,low intensity,poor stability. After excavation,deformation is difficult to control,and the stratum is often skewed,even collapse and other accidents or construction difficulties. The sand layer in maiduoshan coal mine is consist of sand layer,argillite layer, mud-sand stone layer. If considering the influence of water,the physical and mechanical properties will be more complicated,inducing sand inrush, water burst,sand drift and other geological disasters. Research on instability failure mechanism of Water-filled factor in engineering by rock mechanical properties,hydrogeology condition,fault structure,water channels. Evaluate the development of the water-flowing fracture zone,take control countermeasures as mine-drainage water,core drilling,grouting and backfill,roadway measures.The methods were effective for water disaster control.

Introduces several conventional methods and apparatus for filter press filtrate discharge , and analyze their advantages and disadvantages. In order to further improve yield of filter press, reduce the solid content of filtrate, quickly find out the damaged filter cloth. The improvement of the existing press liquid discharge method is carried out, and applied in practice. The results show that: the new device can not only greatly reduce the solid content of filtrate, also can quickly and accurately find damage cloth, reduce down time, improve work efficiency.

Abstract: Gob-side entry retaining(GSER) by pumping concrete has been widely applied in coal mine in China. Due to limitations of many conditions such as underground space and working environment, Pipe blockage become an important restrictive factor in the process of GSER. This technical problem restricts the effective application and promotion of GSER. Based on field measurements and experience, Equipment manufacturing of pumping concrete, filling material preparation and operation mode have been optimized. As a result, prevention measures of pipe blockage was proposed and applied.

Nowadays, as the development of the modernization and mechanization of coal mine, the LHD had become an indispensable equipment of the trackless auxiliary transportation system. Actually, the LHD had been widely used and promoted in the production of coal mine. Meanwhile, due to the complex environment and harsh conditions of coal mine underground, the working stability of the LHD was a key fact in the production safety of coal mine. Taking advantage of the virtual prototype established by Solidworks, the LHD’s working process could be effectively simulated through the kinematic analysis environment based on Adams. The change curve of the vehicle’s gravity center could be drawn simultaneously. Adopted the plane geometry analysis method, the result could be used to analyze and calculate the working stability of the LHD in the static workload state and in the working states on the variable and complex roadbed. Then, the arrangement structure and the gravity centre position could be redesigned though the calculation results. The combination of the simulation method and the plane geometry analysis method could be used as a new way for the stability analysis of the LHD.

The model of the tunneling machine cutting portion was established by ANSYS. The modal analysis was also carried out and the first three order natural frequency and vibration mode of the tunneling machine was obtained. At the same time, the modal test of the tunneling machine cutting portion was carried out by the method of single-point incentive and multi-point response and the first three order natural frequency and vibration mode of the tunneling machine was obtained. Then the simulation model was revised through the contrastive analysis of the test results and simulation results. These conclusions laid solid foundation of the firm-soft coupling model establishing of the tunneling machine and to promote the digitized of the tunneling machine.

The stacker structure of a coal storage yard located in Handan city was reformed. Problems exciting in structure were analyzed. The overall design scheme of structure reconstruction was determined. The scheme was subdivided, including connection construction, bearing design, joint treatment, load selection, load combinations and so on. STCAD truss analysis and design software was applied to analyze the structure. Results showed that the reformed structure has less steel dosage, better safety and economy, and meets the requirements. It can provide references for similar stacker reconstruction design.

The article illustrates the importance of improving the precision of splitwhich is important for Coal mechanical sampling, analysis the research status at home and abroad, proposed a new type of split device. A study of relationship between split precision and the structure or the position of inletvia the coal falling has been done.This study has been used for designing the new type of split device.At the same time, analysis the current problems in split device and put forward the concrete solution, improved the split precision of the split device to a new level, and make a powerful guarantee for mechanical sampling system.

This paper mainly discusses the investment plan management in the enterprise management status and role, from our very large coal group's annual plan management present situation, analyzes the improving plan of investment in fixed assets in the establishment, execution, and analysis each link of the management level of the way and method, it has practical application significance.

The paper selected Shanxi coal price index and economic variables, building VAR model after cointegration test, using impulse response function and variance decomposition method, has carried on the empirical analysis of coal price fluctuation on economic variables. The results showed that: (1) there is a cointegration relationship between coal price index and economic variables in Shanxi Province;(2) In the forecast period, the coal price fluctuations positively impact on CPI and PPI in short-term and long-term; impact on GDP in short-term positively and a long time negatively；(3) From the degree of impact caused by the coal price fluctuation, the degree of impact on PPI is the largest, followed by the CPI, minimal impact is GDP.

By a comprehensive study on the energy saving evaluation of the underground coal mine, this paper puts forward a set of energy saving assessment index system suitable for coal mine, from four aspects about the overall energy efficiency and influence, construction project energy saving assessment, the comprehensive utilization of resources and energy saving management measures which includes 24 indexes. In view of the above indexes, the specific energy-saving evaluation judging methods are proposed, which provides reference for the energy saving evaluation work on underground coal mine.

Aiming at the Steeply Dipping Thick coal seam fully mechanized working face air return Tunnel Fall into disrepair, Originate from gob The upper section goaf gas seepage and Gangue falling In mining period，Based on the broken rock and coal mining, seepage properties of high permeability Darcy, Researched on Pillar Thickness between air return Tunnel and transportation Tunnel (gob)，at last Obtain of the Reasonable layout of air return Tunnel，Divided into four main categories position (I, II, III, IV), two small (Class III - I - II, III).

The narrow coal pillar width of roadway driving along next goaf in fully mechanized top face is reasonable or not directly related to the deformation of roadway and support costs. Aiming at the problem of narrow coal pillar width identified with large section roadway driving along next goaf in fully mechanized top caving face, the influence laws of mining to different width of narrow coal pillar deformation and stress distribution was studied by using numerical simulation of FLAC3D, the reasonable narrow coal pillar width was determined and successfully applied to engineering practice. Some conclusions can be drawn as follows:(1) With the increase of the coal pillar width, without damage area is also increasing; (2) With the working face advance, the vertical stress distribution by the trapezoidal distribution has gradually evolved into a triangular distribution, ahead of 20m is a turning point, to return along the trough strengthening support; (3) The coal pillar width has great influence on distribution of stress influence, with decreasing the width of coal pillar, the vertical stress distribution by the trapezoidal distribution has gradually evolved into a triangular distribution; (4) The displacement of the coal pillar to the roadway was increased gradually with pillar width, and advanced the working face 5m and coal pillar reaches 6 m, tends to be stable; (5) The 5m coal pillar was chosen as the pillar's stress condition better, and grouting reinforcement can satisfy the need of engineering. The research results can provide reference to the design，construction and study for similar projects.

This paper introduces the conditions of coal seam occurrence and 22518 mining face in Dong Jia He Coal mine, analyzes gas emission law of the mining face. Adopts the cross borehole pre pumping and Side pumping by side mining , while layout high drilling for extraction of overlying coal seam gas in mining face. pipes drainage Upper angle in mining surface for the empty area gas as the standby method. Drainages test effects and finds the residual gas content extraction is 2.4m3/t, desorption gas content ranges from 0.65m3/t to 1.12m3/t, the two indexes less than the 6m3/t in the requirements of "coal mine gas extraction standards Interim Provisions". So as to provide same reference for the gas extraction design of the mining face at coal mines with similar condition

There are existing some shortcomings in accurate positioning system applying to coal mine, such as the near cover distance, difficult miniaturization and high cost. Focus on the above shortcomings, a accurate positioning node is designed based on ZigBee. The accurate positioning nodes design divide into two categories: the center node design and the target node design. And they both utilize the same radio frequency chip-JN5168. Meanwhile, center node and target node use different antennas because of different miniaturization needs. After testing in testing coal mine tunnel, applying the designed node to the accurate positioning system can improve the performance of the positioning system, its coverage distance can reach up to 300 meters and its positioning accuracy can reach less than 10 meters.

According to the existed technology system in Tianzhuang Coal Preparation Plant, the coal quality analysis, determine the lump coal inclined wheel separation, fine coal dense medium cyclone coal preparation process, the Slime Separator of coarse slime separation and flotation process modification of Tianzhuang Coal Preparation plant. Introduces the technology characteristics of the process, process layout and equipment selection.

Abstract: Combining with the engineering example, a new large reinforced concrete spherical shell structure of coal development present situation and the construction technology of spherical positions are described briefly. Introduce large reinforced concrete shell structure coal storage under various load combination, adopt FEMAP advanced finite element analysis software of spherical shell structure of the warehouse wall stress is analyzed. For maximum and minimum axial force and bending moment of spherical shell structure, determine the large reinforced concrete wall of spherical shell structure of coal warehouse storage location of the section, the most unfavorable to provide reliable internal force analysis for the engineering design.