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《Chinese Journal of Geophysics》 2005-02
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An experimental study of the electromagnetic emission memory effect during the deformation and fracture of coal or rock

SA Zhan-You 1, HE Xue-Qiu 2, WANG En-Yuan 2, YU Guang-Ming 1 1 Institute of Safety Engineering, Qingdao Technological University, Qingdao 266520, China 2 School of Energy and Safety Engineering, China University of Mining and Technology, Xuzhou 221008, China  
The characters, the contents and their regularity of electromagnetic emission (EME) memory effect during the deformation and fracture of raw coal and molding coal are studied by the experimental methods of uniaxial compression. Its mechanism is discussed and analyzed. The results show that EME of coal or rock has an ability of memorizing previous maximal stress, longitudinal strain, lateral strain and cubical strain. The direct memory contents of coal or rock EME are the previously received maximal stress, longitudinal and lateral strain. Its memory ability rapidly weakens or is entirely lost when the previous stress level exceeds 70%~80%. The irreversibility of EME process is decided by the irreversibility of coal or rock damage fracture process. The irreversibility of coal or rock EME process is the direct reason why EME during the deformation and fracture of coal or rock has memory effect. The theory of coal or rock EME memory effect has broad application prospects in the measurement of crustal stress, the determination of different stress areas in surrounding rock of tunnel and the prediction of coal and rock dynamic disasters, and so on.
【Fund】: 国家杰出青年基金 (5 992 5 411);; 国家自然科学基金 (5 0 13 40 40、5 0 2 0 40 10 );; 建设部资助 (0 4_2_0 15 );; 青岛理工大学博士基金项目 (C2 0 0 4 2 0 1)联合资助
【CateGory Index】: P589
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