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Shock and Vibration
Volume 2015, Article ID 313069, 9 pages
http://dx.doi.org/10.1155/2015/313069
Research Article

Mechanisms of Mining Seismicity under Large Scale Exploitation with Multikey Strata

1School of Resource and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

Received 23 September 2014; Revised 24 January 2015; Accepted 20 February 2015

Academic Editor: Longjun Dong

Copyright © 2015 Hu He et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The dynamic disasters are aggravating with the increase of exploitation scale and intensity in Chinese coal mines, to further understand this problem, we studied the mechanisms of mining tremors induced by key strata movement and instability under large scale exploitation. First the mechanisms were categorized into two groups that is main key strata fracture and movement as well as subkey strata instability again under adjacent mining activities. Based on the key strata theory in ground control we revealed three basic mechanisms of key strata destabilization that are rotary and sliding of low subkey strata, shear sliding of the high subkey strata, and the main key strata rupture and cave at limit span, respectively. The microseismic observing systems were applied to monitor the mining tremor events and verify the theoretical analysis in different coal mines. The characteristics of time-space evolution of tremors show that low inferior key strata causing the most, followed by the high inferior key strata and the main key strata least, however the released energy was just opposite.