岩石三轴实验中的应力路径与应力应变分析  

Relationship between the stress path and the stress-strain in triaxial test

作　　者：刘维国[1] 单钰铭[1] 张莲花[2] 徐进[3] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,成都610059 [2]成都理工大学工程地质研究所,成都610059 [3]四川大学水利水电工程学院,成都610064

出　　处：《成都理工大学学报（自然科学版）》2005年第4期356-361,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金资助项目(40472140)

摘　　要：通过对砂岩、大理岩、角砾大理岩三轴实验中应力路径与应力-应变分析,揭示了在各种试验应力环境中大多数岩样的最大主应力方向的应变为最大;保持围压快速卸荷轴压时出现了-ε1,及与围压无关的岩石弹性泊松比等现象。建议采用以LVDT控制模式保持轴向位移方式下卸围压来模拟人工开挖工程引起的隧道围岩应力重新分布现象。The stress and strain parameters of sandstone, marble and breccia marble samples are measured in the triaxial test of various stress paths. Data analysis shows that the strain in the maximal-stress direction is maximum. The negative axial strain appears under the quickly unloading axial pressure and maintaining confining pressure, and the rock poisson＇s ratio has nothing to do with confining pressure. It is suggested that in the triaxial test the stress redistribution of the tennel surrounding rock is simulated under the condition of maintaing axial displacement by the LVDT model and unloading confining pressure.

关 键 词：岩石 应力路径 应力 应变 三轴实验 

分 类 号：TU45[建筑科学—岩土工程]