Shear behavior of the Triassic sandstone in Sichuan under high pore pressure of H2O/CO2 conditions
Shear behavior of the Triassic sandstone in Sichuan under high pore pressure of H2O/CO2 conditions
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DOI：
10.16285/j.rsm.2018.2273
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发表时间：
2019-08-01
影响因子：
1.5
通讯作者：
Bai Bing
中科院分区：
文献类型：
--
作者：
Zhang Qiang;Li Xiao-chun;Bai Bing
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 phi, 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.
