(1. Changsha Institute of Mining Research Co.，Ltd.，Changsha，Hunan 410012，China；2. National Engineering Research Center for Metal Mining，Changsha，Hunan 410012，China；3. School of Architecture and Civil Engineering，Xiamen University，Xiamen，Fujian 361005，China；4. Jiangxi Xiushui Xianglushan Tungsten Industry Co.，Ltd.，Jiujiang，Jiangxi 332438，China)
Abstract：The geological background，mining background and characteristics of ground pressure of Xianglushan Tungsten mine were briefly described. Aiming at the influence of rainfall permeation on stope stability since 2012，a typical case of stope collapse and the law of ground pressure activity influenced by rainfall permeation were quantitatively analyzed by micriseismic monitoring，the mechanism of stope collapse induced by rainfall permeation was briefly analyzed. The results show that，under the influence of rainfall permeation，microseismic events significantly increased，and the events of the sensors nearby the collapse exceed early warning value before stope collapse. A large-scale stress transfer and distribution appears after the stope collapse，and the stress transfers to perimeter of the ore body arch after stope collapse. A lot of rock fractures and collapses appear in the process of stress redistribution，and the rock mass tends to be stable after nearly two months of stress adjustment. The microseismic event level changes with the rainfall as a whole，and will lag behind. This means the ground pressure activity increases with the increase of rainfall，rainfall permeation is an important causes of stope instability. At last，the prevention and control measures of ground pressure disasters were put forward. This study has important significances for the quantitative assessment of the influence of rainfall permeation on shallow stope stability，and ensuring the safety in underground production.
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2016, Vol. 35 
