期刊文献+

高压孔隙CO2/水作用下完整四川三叠系砂岩剪切特性的试验研究

Shear behavior of the Triassic sandstone in Sichuan under high pore pressure of H2O/CO2 conditions
收藏 分享 导出
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CO24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φ,而CO2对φ几乎不影响;而水对黏结力c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。 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.
作者 张强 李小春 周英博 石露 白冰 ZHANG Qiang;LI Xiao-chun;ZHOU Ying-bo;SHI Lu;BAI Bing(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou,Zhejiang 311122,China;Economic Research Institute,State Grid Hubei Electric Power Company Limited,Wuhan,Hubei 430077,China)
出处 《岩土力学》 EI CAS CSCD 北大核心 2019年第8期3028-3036,共9页 Rock and Soil Mechanics
基金 科技部重点研发计划国际合作项目(No.S2016G9005) 国家自然科学基金面上项目(No.41672252)。
关键词 剪切强度 摩擦系数 CO2地质封存 高孔隙压 剪切渗流 sheath strength friction coefficient CO2 geological storage high pore pressure shear-flow
作者简介 第一作者:张强,男,1989年生,博士研究生,主要从事节理岩体的应力-渗流耦合特性等方面的研究工作。E-mail:zhangqiang02016@163.com;通讯作者:李小春,男,1964年生,博士,研究员,博士生导师,主要从事二氧化碳地质封存等方面的研究工作。E-mail:xcli@whrsm.ac.cn.
  • 相关文献
投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈