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《Journal of China Coal Society》 2012-10
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Experimental study on ULF electromagnetic induction during coal and rock damage failure process

WANG En-yuan1,2,JIA Hui-lin3,LI Nan1,2,4,SONG Da-zhao1,2(1.State Key Lab of Coal Resources and Safe Mining,Xuzhou 221008,China;2.School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;3.College of Applied Science and Technology,China University of Mining and Technology,Xuzhou 221008,China;4.Mining Engineering Department,Missouri University of Science and Technology,Rolla MO 65409,USA)  
The rules of electromagnetic signals of ULF(1 kHz),VLF(5 kHz),and LF(300 kHz),as well as acoustic emission(AE)(42.3 kHz) were studied under two ways of loading including uniaxial compression and shearing with the establishment of acoustic-electric signals test system of coal and rock,and the generating mechanism of ULF electromagnetic signals was preliminarily discussed.The results show that coal and rock under uniaxial compression and shearing can produce ULF electromagnetic signals,which has a better correlation to stress than LF and VLF signals.ULF signals displays a certain degree of advance to stress and AE signals,producing 5~10 s earlier than the two parameters.The ULF electromagnetic signals measured in laboratory mainly induced by the changes of induction field due to the motion of electric charges,and the piezomagnetic effect caused by a small amount of metal mineral composition in coal and rock is another source.This study extends the research scope of EMR of coal and rock.Meanwhile,with the advantages in transmission distance and anti-jamming capability,the study is expected to achieve a breakthrough in long-range and large-scale monitoring for coal and rock dynamic disasters.
【Fund】: 国家自然科学基金资助项目(40874070) 国家自然科学基金青年科学基金资助项目(50904067);; 教育部新世纪优秀人才支持计划资助项目(NCET-10-0768)
【CateGory Index】: TD315
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