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Hou S.,Hebei University of Economics and Business | Hou S.,China University of Mining and Technology | Hou S.,Shanxi Coking Coal Group CO.
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2013

In the coal gas drainage project, thousands of along-seam boreholes were often constructed due to their easy-construction, high-usage and low-cost. Their poor coverage homogeneity would reduce the quantity of coal gas drainage and might facilitate coal gas outburst accidents. Based on the vector algebra theory and computer technology, this study has proposed a novel algorithm for their coverage homogeneity analysis. Firstly, the spatial data structure of along-seam boreholes was built as entityrelation model. Secondly, the coal mass of one coal mining working face as a whole was divided into numerous unit bodies by mesh generation. The coverage rate of each unit body was calculated based on the intersection volume between the unit body and boreholes that traversed it. At last, all unit bodies were synthesized to achieve the coverage homogeneity of the given coal mass, which formed a logical workflow. By testing in Qinan colliery of China, the algorithm was proved to be objective, effective and helpful to improve the digitalization of coal gas drainage project. © Sila Science.


Li Z.,Henan Polytechnic University | Li J.,North China Institute of Science and Technology | He Z.,Shanxi Coking Coal Group Co Ltd
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2014

In order to prevent Karst collapse column conducting ordovician limestone water and making great mine flood, the basic characteristics of Karst collapse column in Shuangliu coal mine are studied by geometric parameters, development characteristics, precursory and distribution characteristics through theoretical analysis and field observation. It indicates that Karst collapse column mainly develops in shallow parts with small faults, while the attitude of coal and rocks is mainly distributed within ordovician limestone Karst dissolution pore and cave development region. Taking X15 Karst collapse column from 220 working face in Shuangliu coal mine as an example, the water inrush risk is analyzed by FLAC3D during mining upper coal group when there is Karst collapse column. The results show that: with working face moving forward, plastic failure fields, stress and seepage field of surrounding Karst collapse column begin to change. When the face moves to 30 m from the Karst collapse column, the plastic failure fields and seepage field begin to contact with each other, and with the face advancing, it extends to heavy water inrush risk.


Liu J.K.,China University of Mining and Technology | Dong C.,China University of Mining and Technology | Dong C.,Shanxi Coking Coal Group CO. | Zhang S.Q.,China University of Mining and Technology | Zhang Y.,China University of Mining and Technology
Applied Mechanics and Materials | Year: 2014

In order to study overlying rock movement rules of fully mechanized top coal caving mining with high cutting height, taking 8100 working face of Tongxin mine as the engineering background, basing on the similarity theory and similarity simulation experiment, the paper analyzed overlburden's deformation, failure and movement laws after mining. Through research, results obtained first cave pace of immediate and basic roof, "three zones" characteristics and overburden displacement characteristic, which could provide a basis for coal mining under similar conditions, a reference for studying overburden movement rules of fully mechanized top coal caving mining with high cutting height and a guide for safe production. © (2014) Trans Tech Publications, Switzerland.


Li J.-S.,Taiyuan University of Technology | Li J.-S.,Shanxi Coking Coal Group Co. | Wang D.,Taiyuan University of Technology | Kang T.-H.,Taiyuan University of Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The clay rock in coal stratum is scanned non-destructively by micro-CT, and the algorithm of rock pore structure (the porosity and the pore aperture) is studied by use of Matlab based on the micro-CT image. The results show that the combination of micro-CT scanning, digital image processing and three-dimensional reconstruction can provide a new, simple and feasible method for the analysis of rock pore structure. The computer system of micro-CT experiment can generate CT single section and the porosity of rock is calculated by use of digital image processing. The new images with different resolutions are generated by image compression. When the pixel sizes of the new images are taken as the pore aperture, the rules of the rock porosity variation with the pore aperture are estimated on micro-CT single image. The volume rendering algorithm of visualized reconstruction can make the sequences which stem from the single image generate three-dimensional digital image, by which the rock porosity and the pore aperture are computed. For example, with the increase of the pore aperture, the porosity of clay rock in coal stratum is reduced by the negative exponent rule, and the result is identical with the aperture distribution measured by mercury porosimeter method.


Jin Z.-X.,Shanxi Coking Coal Group Co. | Yu B.,Datong Coal Mines Group Co.
Journal of Coal Science and Engineering | Year: 2012

Flow field in multilayer gob area, which formed in small hiden-depth, multi-coal layer groups, close distance, hard coal layer, and hard roof, possesses characteristics such as complex, changeable and unstable. Dynamic balance theory of local flow field in multilayer gob area was built based on the realistic requirement that the serious threat on current mining coal layer by large-scale spontaneous combustion fire on close spontaneous combustion coal layer group of Datong Coal mining area at the 'di-hard' conditions was caused by small coal pit mining. The kernel was in dynamic balance between flow field pressures of working face and local flow field in multilayer gob area was kept by transformation. Corresponding technology and set of devices were developed. © The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg 2012.


Zhang M.,Taiyuan University of Technology | Wu S.,Taiyuan University of Technology | Wang Y.,Shanxi Coking Coal Group Co.
Safety Science | Year: 2012

While coal seam is being mined, an annular fissure circle with gas accumulation will be formed in the fissure zone as a result of desorption, dissipation and permeation of gas in the goaf area and overlying strata due to fissures from rock caving and mitigation in the roof. The methods for computation of spatial locations of the fissure circle are researched in this paper. Based on these methods, gas drainage technique for the fissure zone is optimized. By applying drill hole returning water method of variables, the height of caving zone that most affects the drainage effects of inclined high dip drill hole was measured on the site. Due to the consistency of the expected height with the computed height of caving lines at different positions, the correctness of the theoretical computation method is further validated. Meanwhile, the parameters of the inclined high dip drill hole at #3311 working face of Hexi Coal Mine are determined by a case study. © 2011 Elsevier Ltd.


Li J.-L.,Taiyuan University of Technology | Li J.-L.,Shanxi Coking Coal Group Co. | Yang Z.-J.,Taiyuan University of Technology | Pang X.-Y.,Taiyuan University of Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

To overcome the instability of the diagnostic reasoning results caused by the difficulty in knowledge acquisition, the single knowledge representation, and the poor self-adaptation ability of fault diagnosis reasoning method in traditional hoist fault diagnosis systems, the hoist fault diagnosis method based on knowledge engineering is investigated. Fault diagnostic rule knowledge acquisition methods based on improved attribute importance is proposed, and it provides a data basis for hoist fault diagnosis. The mine hoist fault diagnostic ontology knowledge base is constructed and the fault diagnostic ontology knowledge representation methods based on OWL DL and fault diagnostic rule knowledge representation methods based on SWRL are proposed, and the hoist system structure and the diagnosis knowledge integration are implemented. The probability of the ontology knowledge is extended, and a new fault diagnosis uncertainty knowledge reasoning method is proposed, which are based on ontology and Bayesian. Based on the theory and method above, the fault monitoring and diagnosis system of the mine hoist is developed, and the method is proved to be feasible and reliabile. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.


You H.,Henan Polytechnic University | You H.,Shanxi Coking Coal Group Co. | Yu M.,Henan Polytechnic University | Zheng L.,Henan Polytechnic University | An A.,Henan Polytechnic University
Procedia Engineering | Year: 2011

In order to develop highly effective and reliable measures to suppress the coal dust/methane/air mixture explosion frequently occurred in coal mine, the effect of the presence of methane on the coal dust explosion was investigated in this study. The flame propagation velocity and the explosion temperature were measured for explosion tests with the different methane concentration in the mixture. The flame evolution histories were also captured by high speed camera. The inhibiting efficiency of water mist was qualitatively studied and analyzed by explaining mechanism of gas and goal dust explosion. The results showed that water mist can efficiently decline the flame propagation velocity, reduce flame temperature, and change flame characteristics of gas and coal dust explosion. It can be concluded that water mist can effectively inhibit gas and coal dust explosion. © 2011 Published by Elsevier Ltd.


Yu M.-G.,Henan Polytechnic University | Zhao W.-L.,Henan Polytechnic University | You H.,Henan Polytechnic University | You H.,Shanxi Coking Coal Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Experimental system of self-ignition during discharge of high-pressure gas was designed and built, then self-ignition conditions of high-pressure gas in addition to its jet flame of nozzle propagating rule were investigated. The experimental facility and test system were composed of high-pressure gas reservoir and conveying system, data acquisition and measurement system, rupture disk clamping system and the downstream releasing piping system. The results indicate that the self-ignition phenomenon is occurred during abrupt discharge of high-pressure gas into the atmosphere on some discharge conditions of discharging initial pressure and the downstream piping length, when higher pressure, the possibility of self-ignition is occurred with a short piping, furthermore, the pressure at which the auto-ignition is occurred appeared to be decreased with increasing the piping length. When self-ignition during discharge of high-pressure gas, energy of flame and shock is declined, shock wave velocity and overpressure also is decreased gradually with distance of flame propagation increasing, however, peak of overpressure of which damping is reduced gradually.


Yu M.-G.,Henan Polytechnic University | An A.,Henan Polytechnic University | You H.,Henan Polytechnic University | You H.,Shanxi Coking Coal Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

The inhibiting efficiency of water spray was studied and analyzed qualitatively and quantitatively by constructing small size experimental platform and explaining mechanism of gas explosion. The results show that when there is adequate water spray, it can efficiently prevent propagation velocity, reduce flame temperature, and change flame characteristics of gas explosion; when gas concentration is higher, or spray flux is inadequate, the water spray will promote the occurrence of gas explosion through the combustion assistance.

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