Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (8): 3028-3036.doi: 10.16285/j.rsm.2018.2273

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Shear behavior of the Triassic sandstone in Sichuan under high pore pressure of H2O/CO2 conditions

ZHANG Qiang1, 2, 3, LI Xiao-chun1, ZHOU Ying-bo4, SHI Lu1, BAI Bing1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. PowerChina Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 311122, China; 4. Economic Research Institute, State Grid Hubei Electric Power Company Limited, Wuhan, Hubei 430077, China
  • Received:2018-12-17 Online:2019-08-12 Published:2019-08-25
  • Supported by:
    This work was supported by the Key Research and Development Program of International Cooperation of Ministry of Science and Technology (S2016G9005) and the General Program of National Natural Science Foundation of China (41672252).

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Abstract: Understanding shear behavior of a sandstone is vital for underground engineering projects, such as mining, underwater tunnel excavation and CO2 geological storage, and so on. In this study, the shear behavior of a intact sandstone under dry/saturated/H2O-injected/CO2-injected conditions were conducted using a shear-flow test apparatus. The results show that the shear strength and the residual shear strength were increase with the effective normal stress under dry/saturated/H2O-injected/CO2-injected conditions. The shear stiffness was also increase with the normal stress under dry condition. The effect of pore pressure on the shear strength follows the Terzaghi effective stress law. Water/CO2 could weaken the shear strength. Water lowered the internal friction angle φ, CO2 hardly affected it. CO2 lowers the cohesion stronger than that of water. The reasons of the weakening effect of water and CO2 were the interaction of fluid-rock, and the weakening effect of water on the clay contained in the sandstone was stronger than that of CO2.

Key words: sheath strength, friction coefficient, CO2 geological storage, high pore pressure, shear-flow

CLC Number: 

  • TU 432
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