›› 2017, Vol. 38 ›› Issue (8): 2213-2220.doi: 10.16285/j.rsm.2017.08.008

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study on shear-seepage of coupled properties for complete sandstone under the action of seepage water pressure

PENG Shou-jian1, 2, 3, TAN Hu1, 2, XU Jiang1, 2, LIU Yi-xin1, 2   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China; 3. Chongqing Research Institute of China Coal Technology and Engineering Group Corp., Chongqing 400037, China
  • Received:2015-09-27 Online:2017-08-11 Published:2018-06-05
  • Supported by:

    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).

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.

Key words: sandstone, seepage water pressure, shear-seepage, coupling characteristic, normal stress

CLC Number: 

  • TU 452

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