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《Safety in Coal Mines》 2017-06
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Study on Electric Potential Characteristics of Coal Fracture Under Uniaxial Compression and Gas Confining Pressure

LIU Shuaijie;LI Zhonghui;NIU Yue;YIN Shan;KONG Yanhui;CHEN Fuqi;WEI Yang;School of Safety Engineering, China University of Mining and Technology;National Engineering Research Center for Coal Gas Control, China University of Mining and Technology;Key Laboratory of Gas and Fire Control for Coal Mines of the Ministry of Education, China University of Mining and Technology;  
In order to study the influential effect of gas environment on coal surface potential under the uniaxial loading condition,we build the coal uniaxial compression failure observation monitoring system under the nitrogen confining pressure, the surface potential of coal under different confining pressure was tested; the influence mechanism of coal loading and gas on the potential was discussed. The experimental results show that the coal in confining pressure loading can produce the surface potential signal,and the potential signal and the changes of stress and gas pressure have a certain relevance; for the same type of coal, with the increase of filling nitrogen pressure, the stress of coal structure changes. The fluctuation range of potential signal increases about0.2 m V, the amplitude of the mutation is obvious, and the potential difference increases from 0 m V to 2 m V before the coal main rupture occurs. When the main fracture occurs, the potential signal increases obviously.
【Fund】: “十三五”国家重点研发计划资助项目(2016YFC0801404);; 国家自然科学基金资助项目(51674254)
【CateGory Index】: TD713
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