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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. Source

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. Source

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. Source

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. Source

Li Z.,Henan Polytechnic University | Li J.,North China Institute of Science and Technology | He Z.,Shanxi Coking Coal Group CO.
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. Source

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