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| Experimental study on seepage characteristics of red sandstone with different confining pressures and different damage degrees |
| ZHANG Peisen1，2，HOU Jiqun1，2，ZHAO Chengye1，2，LI Tenghui1，2 |
(1. National Key Laboratory for Mine Disaster Prevention and Control，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；2. National Demonstration Center for Experimental Mining Engineering Education，Shandong
University of Science and Technology，Qingdao，Shandong 266590，China) |
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Abstract In order to study the seepage characteristics of red sandstone under different confining pressures and damage degrees，water-force coupling tests of red sandstone under different confining pressures were carried out by Rock Top multi-field coupling apparatus. The results show that，with increasing the confining pressure at a constant gradient，the failure mode changes from single master crack splitting failure to multi-crack stacked dendritic failure and the failure surface is powdery under high confining pressure. Under the same deviator stress，the permeability decreases with increasing the confining pressure，showing that the confining pressure has a significant effect on seepage inhibition. When the gradient of the deviation stress grows，the permeability variation range decreases with increasing the confining pressure. With increasing the confining pressure as a constant gradient，the initial stress and damage stress of the rock sample increase gradually，but the change range decreases gradually. It was found by steady-state method and transient method that the permeability under different confining pressures experiences four stages of slow decline，approximate stable，slow increase and rapid growth before peak stress，corresponding to the stress-strain curve. Based on the test results，the relationship between the rock damage index and the permeability was deduced，and the evolution law of the permeability with the rock damage index was revealed.
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2020, Vol. 39 
