Analysis of microseismic activity in rock mass controlled by fault in deep metal mine |
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| Affiliation: | 1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China;2. Northern Engineering & Technology Corporation, MCC, Dalian 116000, China;3. China Nonferrous Metal Group, Fushun Hongtoushan Mining Co. Ltd., Fushun 113000, China;1. School of Mines, China University of Mining & Technology, Xuzhou 221116, China;2. State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China;3. Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China;1. College of Mineral Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;2. Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an 710054, China;3. State Key Laboratory of Deep Coal Mining & Environment Protection, Huainan 710054, China |
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| Abstract: | Aiming at evaluating the stability of a rock mass near a fault,a microseismic(MS) monitoring system was established in Hongtoushan copper mine.The distribution of displacement and log(/),the relationship between MS activity and the exploitation process,and the stability of the rock mass controlled by a fault were studied.The results obtained from microseismic data showed that MS events were mainly concentrated al the footwall of the fault.When the distance to the fault exceeded 20 m,the rock mass reached a relatively stable state.MS activity is closely related to the mining process.Under the strong disturbance from blasting,the initiation and propagation of cracks is much faster.MS activity belongs in the category of aftershocks after large scale excavation.The displacement and log(C/) obtained from MS events can reflect the difference in physical and mechanical behavior of different areas within the rock mass,which is useful in judging the integrity and degradation of the rock mass. |
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| Keywords: | Deep mining Fault Microseism (MS) Stability |
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