水利学报2017，Vol.48Issue(2)：203-209,7.DOI:10.13243/j.cnki.slxb.20160908
干湿循环条件下干燥应力历史对粉质黏土饱和力学特性的影响
Influence of drying stress history on the mechanical behaviors of silty clay under saturated condition
摘要
Abstract
A series of consolidated undrained triaxial tests were performed to measure variations of mechanical behaviors of silt clay from Dalian,China during drying/wetting process.These tests were conducted under the saturated condition after the specimens were subjected to different drying stress histories.By contrastively analyzing the stress-strain relationship,pore-water pressure,and effective stress path of different cases,the influence of drying stress history on the mechanical behaviors of silty clay under saturated condition was studied.The test results show that the influence of drying/wetting on mechanical behaviours of silty clay under saturated condition relates to the drying stress,and the mechanical behaviours are varied more significant with higher drying stress.At the same confining pressure,the shear stiffness of the specimens subjected to drying/wetting cycle are higher than that of the initial specimens during the initial stage of shearing.The higher drying stress that specimens experienced,the higher initial shear stiffness produced.With the increase of the drying stress,the stress-strain relationship curves of silty clay alter from strain hardening to strain softening,and the development of pore water pressure converts from increase following by decrease to continue growing.The effective stress path of the initial specimens is similar to a shape of "S",whereas,the effective stress path of the specimens experienced high drying stress turns to develop towards the lower left side.Irreversible compression of soil skeleton and the micro-cracks develop during drying/wetting process,impacting the mechanical behaviors of silty clay under saturated condition.关键词
干湿循环/干燥应力/抗剪强度/应力路径Key words
drying/wetting/drying stress/shear strength/stress path分类
建筑与水利引用本文复制引用
刘文化,杨庆,孙秀丽,华渊..干湿循环条件下干燥应力历史对粉质黏土饱和力学特性的影响[J].水利学报,2017,48(2):203-209,7.基金项目
国家自然科学基金项目(41572252,51609102) （41572252,51609102）
大连理工大学海岸与近海工程国家重点实验室开放基金(LP1613) （LP1613）
