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

ZHANG Qiang; LI Xiao-chun; ZHOU Ying-bo; SHI Lu; BAI Bing

doi:10.16285/j.rsm.2018.2273

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

更新时间：2026-06-25

- Shear behavior of the Triassic sandstone in Sichuan under high pore pressure of H2O/CO2 conditions
- Vol. 40, Issue 8, Pages: 3028-3036(2019)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北,武汉,430071
  2. 中国科学院大学,北京,100049
  3. 中国电建集团华东勘测设计研究院有限公司,浙江,杭州,311122
  4. 国网湖北省电力有限公司经济技术研究院,湖北,武汉,430077
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.2273
  CLC： TU432
- Online First：25 August 2019，
  
  Published：2019
- 稿件说明：
移动端阅览
ZHANG Qiang, LI Xiao-chun, ZHOU Ying-bo, et al. Shear behavior of the Triassic sandstone in Sichuan under high pore pressure of H2O/CO2 conditions[J]. 2019, 40(8): 3028-3036.
DOI：

ZHANG Qiang, LI Xiao-chun, ZHOU Ying-bo, et al. Shear behavior of the Triassic sandstone in Sichuan under high pore pressure of H2O/CO2 conditions[J]. 2019, 40(8): 3028-3036. DOI： 10.16285/j.rsm.2018.2273.

摘要

越来越多的地下岩土工程面临着高压孔隙流体的作用，研究高压孔隙CO2/水作用下岩石的剪切特性对工程设计及安全施工、运营具有重要意义。研究了完整四川三叠系砂岩在干燥、饱和水、高压孔隙水和高压孔隙CO2 4种不同条件下的剪切特性。研究发现：4种不同条件下砂岩的剪切强度和残余剪切强度都会随着预剪切面上有效正应力的增加而增加；在干燥条件下随正应力的增加砂岩的剪切刚度也会增大。孔隙压力对砂岩剪切强度的影响遵守Terzaghi有效应力原理。水和CO2对砂岩的剪切强度具有显著的弱化作用，水会明显降低内摩擦角，而CO2对几乎不影响；而水对黏结力的影响小于CO2的影响。其弱化作用可以归结为水/CO2-岩石之间的相互作用，由于砂岩中含有黏土成分，水和CO2都会对黏土产生软化作用。

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.

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