三轴应力条件下上海灰色粘土的CT细观试验研究  

Testing on Shanghai gray clay subjected to triaxial loading by computerized tomography

作　　者：孙红[1] 葛修润[1] 蒲毅彬[1] 牛富俊[1] 马巍[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室

出　　处：《岩土力学》2004年第9期1455-1459,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(编号:10172057;10202019);中科院寒区旱区环境与工程研究所冻土工程国家重点实验室资助项目

摘　　要：采用 CT 实时实验对上海灰色粘土在三轴应力条件下的特性进行系统的实验研究。研究结果表明,上海灰色粘土的变形有两种形式,一是以均匀性变形为主,二是以局部变形为主。在三轴应力条件下后者细观变形基本上分为三个阶段:微裂纹萌生轻微发展阶段、局部变形快速发展阶段和软化破坏阶段。粘土具有初始各向异性,变形也是各向异性的。Studies on Shanghai gray clay subjected to triaxial loading using real-time computerized tomography scanning experiment are carried out. It is shown that deformation of clay has two types, one is manifested by uniform deformation, the other is manifested by local deformation. The stress-strain curve of the latter is divided into three stages, i.e. the first is that the new microcracks appear and develop slightly; the second is local deformation develops quickly; and the third is softening failure. Gray clay is a typical material which is inhomogenous at the initial state, and its deformation is anisotropic.

关 键 词：粘土 CT试验 局部变形 各向异性 

分 类 号：TU431[建筑科学—岩土工程]