Title: Focal mechanism solutions for roof collapse in deep mine

Authors: Chun-lai Wang; Hui Lu; Fu-li Wang; Wei-qiang Li; Ming Luo; Lu Liu; Zhi-jiang Lu; Ai-xiang Wu; Xiao-hui Liu

Addresses: Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing, Xueyuan Road, Ding 11, Haidian District, Beijing, P.C. 100083, China ' Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing, Xueyuan Road, Ding 11, Haidian District, Beijing, P.C. 100083, China ' Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing, Xueyuan Road, Ding 11, Haidian District, Beijing, P.C. 100083, China ' Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing, Xueyuan Road, Ding 11, Haidian District, Beijing, P.C. 100083, China ' Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing, Xueyuan Road, Ding 11, Haidian District, Beijing, P.C. 100083, China ' Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing, Xueyuan Road, Ding 11, Haidian District, Beijing, P.C. 100083, China ' Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing, Xueyuan Road, Ding 11, Haidian District, Beijing, P.C. 100083, China ' School of Civil & Environment Engineering, University of Science & Technology Beijing, Xueyuan Road, No. 30, Haidian District, Beijing, P.C.100083, China ' School of Civil & Environment Engineering, University of Science & Technology Beijing, Xueyuan Road, No. 30, Haidian District, Beijing, P.C.100083, China

Abstract: Microseismic monitoring is an effective means of forecasting instabilities in ruptured rock masses during deep mining. Based on the complex geological conditions of a mine in Southwest China, a digital 24-channel microseismic monitoring system was established to monitor microseismic events during deep mining. In the monitoring period, the focal mechanism solutions of roof collapse accidents were analysed using a double couple model. The results show that the focal mechanism solutions of the double couple model can be used to explain roof ruptures and instabilities. Two seismic source events were located at the F4 active fault, and the other seismic source event was located at the rock stratums demarcation line between little eighth orebody and C₁b stratum. It was concluded that the active microseismic events were caused by deep mining. The method can be used to forecast roof collapse.

Keywords: deep mining; roof collapse forecasting; microseismic monitoring; double couple model; focal mechanism solution; deep mines; instability forecasting; ruptured rock masses; China; roof ruptures.

DOI: 10.1504/IJMME.2015.067948

International Journal of Mining and Mineral Engineering, 2015 Vol.6 No.1, pp.22 - 34

Received: 02 Aug 2013
Accepted: 29 Apr 2014
Published online: 10 Mar 2015 *

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