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《Journal of China University of Mining & Technology》 2016-03
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Study on the mechanism of delayed water inrush of collapse column under the influence of mining

ZHANG Boyang;BAI Haibo;ZHANG Kai;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining & Technology;  
In order to investigate the hysteresis and burstiness of water-inrush from collapse column,based on the stress variation rules of collapse column before and after mining,the permeability test of the broken rock mass was conducted through self-designed broken rock mass seepage test system.The influence of axial compression on the broken rock mass seepage characteristics in stress concentration condition was analyzed.The fractional dimension change rule after secondary breaking of the broken rock mass and its influence on seepage was elaborated.The change rules of collapse column permeability and starting pressure gradient under the influence of mining were studied.The results show that under the influence of mining,the collapse column goes through a change process of original rock stress-stress concentration-stress release.In this change process,the permeability decreases first and then increases whereas starting pressure gradient increases first and then decreases.The hysteresis of collapse column water-inrush is a combined result of the compaction of broken rock mass,the decrease of permeability after the secondary breaking,and seepage attenuation caused by particle migration under the influence of mining.
【Key Words】: collapse column water-inrush mechanism porosity fractal dimension hysteresis
【Fund】: 国家重点基础研究发展计划(973)项目(2013CB227900)
【CateGory Index】: TD745
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