梁劲,王强,胡新丽,王斌,宗浩,王剑,李岚星

• 1:中国地质大学(武汉)工程学院
• 2:中南勘察基础工程有限公司

摘要(Abstract)：

三峡库区广泛分布侏罗系红砂岩，在水库运行期间红砂岩的渗流-应力耦合特性关乎库区内多数滑坡和岩质边坡的稳定性。借助岩石多场耦合三轴试验系统，对三峡库区侏罗系红砂岩开展了不同围压、不同渗透压下的三轴压缩试验，系统研究了红砂岩的三轴压缩力学特性和渗透率演化特征。研究结果表明：(1)红砂岩的峰前应力-应变曲线可分为孔隙压密阶段、弹性变形阶段、微裂隙稳定发展阶段和非稳定发展阶段。红砂岩的力学参数与渗透压的关系呈负相关，与围压呈正相关。(2)随着围压升高，红砂岩的破坏模式由张拉破坏过渡到剪切破坏。(3)不同渗透压下，渗透率曲线呈平稳发展→缓慢上升→快速上升3阶段演化规律；不同围压下，渗透率曲线先降低后升高。(4)从能量角度分析了渗透压和围压对岩石的作用，验证了渗流对岩石的劣化效应以及围压对裂纹发展的抑制作用。本试验对鲜有报道的侏罗系红砂岩的强度、变形和渗透特性做了系统的研究，对渗流-应力耦合课题有补充意义。其工况根据三峡库区边坡岩体的应力水平来确定，试验结果对分析库区边坡稳定性具有指导意义。

关键词(KeyWords)： 渗流-应力耦合;侏罗系红砂岩;三轴压缩;渗透特性;能量耗散

Abstract:

Keywords:

基金项目(Foundation): 重点国际(地区)合作与交流项目(42020104006);; 国家重点研发计划(2017YFC1501302);; 国家自然科学基金重点项目(41630643)

作者(Author): 梁劲,王强,胡新丽,王斌,宗浩,王剑,李岚星

DOI: 10.19509/j.cnki.dzkq.2022.0237

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