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Seismic Investigation on Characteristic of Overlying Strata Movement in Unsymmetrical Isolated Longwall Mining
LIU Zhangli 1,MU Zonglong 1 *,DOU Linming 2,CAO Anye 2
1.School of Mines, State Key Laboratory of Coal Resource and Mine Safety, China University of Mining & Technology
2.School of Mines, State Key Laboratory of Coal Resource and Mine Safety, China University of Mining & Technology, Xuzhou, Jiangsu 221116
*Correspondence author
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Funding: none
Opened online:21 October 2011
Accepted by: none
Citation: LIU Zhangli,MU Zonglong,DOU Linming.Seismic Investigation on Characteristic of Overlying Strata Movement in Unsymmetrical Isolated Longwall Mining[OL]. [21 October 2011] http://en.paper.edu.cn/en_releasepaper/content/4445454
 
 
Based on the key stratum theory, overlying strata structures above a typical unsymmetrical isolated face (LW10302) is analyzed, and a microseismic monitoring is also applied to characterize the fracturing propagations associated with overburden movement in mining progress. The results show that the overlying strata above LW10302 can be divided into key strata of different grades, and the formed "O-X" fracturing structure have the main and inferior "O-X" ones. The spatial evolution of seismic events demonstrated that seismic activities fits very well with the overburden fracturing patterns and stress manifestation around the longwall face. In the mining process, most of the events located within the surrounding strata of LW10301 and 10302 while low energy events distributed mainly in multiple roof and floor strata, and the strong tremors occurred almost within the super-thick primary key strata and appeared to be related to shear fracturing of large-scale overburden movement. Additionally, seismic signals corresponding to different failure mechanisms show different characteristics in waveform features. The study in this paper indicates that microseismic monitoring can provide invaluable information to characterize the mining-induced seismicity and reveal the failure patterns within strata associated with mining, which will greatly benefit the alleviation and prevention of rock burst hazards in mines.
Keywords:unsymmetrical isolated face; overburden structure; strong tremor; microseismic monitoring; rock burst; spatial evolution
 
 
 

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