(1. School of Energy and Mining Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources，China University of Mining and Technology (Beijing)，Beijing 100083，China；3. National Demonstration Center for Experimental Safe Coal Mining and Geological Guarantee Education，China University of Mining and Technology(Beijing)，Beijing 100083，China；4. School of Civil and Transportation Engineering，Hebei University of Technology，Tianjin 300401，China)
Abstract：Stress-seepage coupling tests of sandstone under anhydrous and drainage conditions were conducted by using the automatic triaxial seepage experiment system. The stress-strain and permeability evolution curves of sandstone were obtained during the deformation process，which could better characterize the mechanical behaviors and permeability evolution response characteristics of sandstone under stress-seepage coupling，and the evolution law of deformation，strength and permeability of sandstone was investigated under stress-seepage coupling condition. The results show that the peak strength of sandstone increases with increasing the confining pressure，which shows that confining pressure effect is significant. The axial strain evolution law corresponding to the peak strength is in obvious accordance with the strength evolution characteristics under the anhydrous condition. The axial deformation of sandstone accords an exponential nonlinear growth relation with the confining pressure under the anhydrous condition，while the relationship between the axial deformation of sandstone and the effective confining pressure under drainage condition obeys a linear attenuation model. The pre-peak permeability of sandstone shows a“three-stage”evolution law of decreasing slowly firstly，then developing steadily and increasing sharply lastly，which respectively corresponds to the initial micro-crack compaction stage，linear elastic deformation stage and new crack propagation stage of the pre-peak stress-strain curve of sandstone. The permeability of sandstone also shows a three-stage evolution law including decreasing firstly and followed by increasing sharply and developing stably or increasing slightly under different working conditions，which also has a corresponding relationship with the volume compression stage，volume rapid expansion stage and volume slow expansion stage during the deformation process. The research conclusions can provide a theoretical basis for the prevention and control of water inrush accidents in coal mine and the stability controll of roadway surrounding rock.
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2019, Vol. 38 
