Experimental study on stress-seepage coupling properties of sandstone under different drainage conditions
WANG Wei1，2，CHEN Xi1，2，TIAN Zhenyuan1，2，ZHU Qizhi1，2，XU Weiya1，2，RUAN Huaining1，2
(1. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；2. Key Laboratory of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Stress-seepage coupling is one of fundamental problems in rock mechanics. In order to investigate the hydro mechanical coupling properties of sandstone，a series of triaxial compression tests under drained and undrained conditions are carried out. Based on the experimental results，the following conclusions are obtained. The elastic modulus，peak strength，crack initiation stress and expansion stress increase with the increased confining pressure. Under drained condition，pore water pressure can weaken the effect of confining pressure，which leads to the decrease in mechanical properties of rocks. It appears that cohesion is more sensitive to pore pressure than internal friction angle. Under undrained condition，the peak stress of pore pressure appears around expansion stress，which indicates the initiation of microcracks in rocks. In the condition of the same initial pore pressure，peak stress of pore pressure increased with the confining pressure and under the same confining pressure，the change of pore water pressure is more obvious when the initial pore pressure is lager. The peak strength，crack closure stress，crack initiation stress and expansion stress under undrained condition are lower than those under the condition of drainage.
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2016, Vol. 35 
