冻结粉质黏土三轴抗压强度和变形特性试验研究  

Experimental study on triaxial compressive strength and deformation behaviors of frozen silty clay

作　　者：牛亚强[1] 赖远明[1,2] 王旭[1] 廖孟柯[2] 高娟[2] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]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,甘肃兰州730000

出　　处：《冰川冻土》2016年第2期424-430,共7页Journal of Glaciology and Geocryology

基　　金：国家重点基础研究发展计划(973计划)项目(2012CB026102);国家自然科学基金项目(41230630);中国科学院西部行动计划项目(KZCX2-XB3-19)资助

摘　　要：通过对-6℃冻结粉质黏土在1~9 MPa的围压范围内进行一系列的三轴压缩试验,分析了冻土的变形和强度特性.结果表明：不同围压下,冻结粉质黏土的应力-应变曲线形态基本相似,而软化程度及初始阶段的硬化速率则有所不同.根据摩尔-库仑准则,得到广义黏聚力和广义内摩擦角随围压的变化规律,同时基于包络线理论建立非线性强度准则,以描述冻结粉质黏土强度随围压先增大后减小的变化规律.In order to study the deformation and strength behaviors of frozen silty clay,a series of triaxial com-pression tests were conducted under confining pressure from 1 MPa to 9 MPa at？6 °C. The results show that the shapes of stress-strain curves are similar under different confining pressures,while the hardening rate at the ini-tial phase and the softening degree are different. According to Mohr-Coulomb criterion,the variation of general-ized cohesion and internal friction angle with confining pressures are calculated from the experimental results, meanwhile,a nonlinear strength criterion is put forward based on the envelope theory to describe the strength of frozen silty clay increases at first then decreases with the increasing of confining pressure.

关 键 词：冻结粉质黏土 变形规律 强度特性 试验研究 

分 类 号：TU445[建筑科学—岩土工程]