简文星,潘永亮,李林均,李豪,徐长江

• 1:中国地质大学(武汉)工程学院
• 2:中国市政工程中南设计研究总院有限公司
• 3:重庆市勘测院

摘要(Abstract)：

三峡库区侏罗系地层滑坡发育广泛，研究该地层软岩夹层在不同水压力作用下的强度及变形破坏特性对库区岸坡的长期稳定性评价具有重要理论指导意义。以三峡库区侏罗系典型软岩——沙溪庙组泥质粉砂岩为例，对其进行了不同水压力下的力学试验系统(MTS)三轴压缩试验，并基于断裂力学与有效应力原理对水-力耦合效应下岩石的起裂及裂纹扩展机制进行了分析。研究结果表明：水压力的存在可降低岩石的峰值抗压强度，水压力越大岩石破坏后控制性裂纹的长度及倾角也总体随之增大，次生裂纹的数目也呈现出随之增多的趋势；原生裂纹的起裂及次生裂纹的扩展分别受控于K_Ⅱ、K_Ⅰ型应力强度因子，原生裂纹的起裂角最大为70.5°;次生裂纹的临界扩展长度随原生裂纹长度的增加而增大，当原生裂纹倾角约为45°时，在相同条件下次生裂纹的扩展长度最大；说明水压力的存在加剧了岩石裂纹的扩展，且使岩石的张拉破坏趋势更为明显，而原生裂纹形态特征对裂纹的扩展规律亦具有较大的影响。

关键词(KeyWords)： 三峡库区;侏罗系软岩;水压力;裂纹扩展;力学机制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“三峡库区典型顺向岸坡库水与降雨联合作用失稳观测与理论解析”(41272306)

作者(Author): 简文星,潘永亮,李林均,李豪,徐长江

DOI: 10.19509/j.cnki.dzkq.2022.0036

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