岩土力学2017，Vol.38Issue(8)：2213-2220,8.DOI:10.16285/j.rsm.2017.08.008
渗透水压作用下完整砂岩剪切-渗流耦合试验研究
Experimental study on shear-seepage of coupled properties for complete sandstone under the action of seepage water pressure
摘要
Abstract
By using a self-developed shear-seepage coupling experimental device for coal rock,experiments were carried out on sandstone samples to obtain shear-seepage coupled properties under the action of seepage water.The results show that with constant seepage water pressure,the larger normal stress was,the higher shear strength was,but the smaller normal deformation was.Moreover,the shear deformation process of sandstone can be divided into three stages:the linear growth stage,the unstable fracture stage and the friction sliding stage,respectively.In the case of the constant seepage water pressure,as the normal stress decreased,the peak values of normal and shear deformation of specimen increased,and meanwhile the fluctuation of shear section grew.Besides,the surface crack growth became more obvious and widely distributed,and the damage of sandstone was more serious.In the total shear process,there were several apparent value reductions of shear stress.Usually,the first stress reduction occurred at the end of the stage of elastic deformation,and water flowed out at the same time,which means the first stress reduction caused by the first macrocrack is spatial connected.Furthermore,the larger normal stress is,the narrower fracture is and the worse water transmitting ability is.During the whole experimental process,the lower mean flow rate is,the smaller total flow is.关键词
砂岩/渗透水压/剪切-渗流/耦合特征/法向应力Key words
sandstone/seepage water pressure/shear-seepage/coupling characteristic/normal stress分类
建筑与水利引用本文复制引用
彭守建,谭虎,许江,刘义鑫..渗透水压作用下完整砂岩剪切-渗流耦合试验研究[J].岩土力学,2017,38(8):2213-2220,8.基金项目
国家自然科学基金项目(No.51304255,No.51474040).中国博士后科学基金资助项目(No.2014M552323) （No.51304255,No.51474040）
重庆市项目博士后资助(No.Xm2014037).This work was supported by the National Natural Science Foundation of China (51304255,51474040),the China Postdoctoral Science Foundation (2014M552323) and the Postdoctoral Project Foundation of Chongqing (Xm2014037). （No.Xm2014037）
