考虑温度影响的宁波软土临界状态参数研究  

A study of the critical state parameter of the Ningbo soft clay considering the effect of temperature

作　　者：祁良[1] 郑荣跃[1] 陶海冰[1,2] 刘干斌[1] 

机构地区：[1]宁波大学岩土工程研究所,浙江宁波315211 [2]浙江大学滨海和城市岩土工程研究中心,浙江杭州310027

出　　处：《水文地质工程地质》2015年第5期79-83,共5页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目资助(51278256)

摘　　要：为探讨温度对土的临界状态参数的影响,开展了不同围压下宁波软黏土温控三轴试验,获得了不同温度下土的M值变化规律,利用ABAQUS对试验进行模拟验证,结果表明:不同温度下土体应力-应变曲线均呈现出较为明显的硬化形态;温度越高,土体破坏时的偏应力越大、剪切产生的孔压越小;不同温度下的有效应力路径曲线相似,且随着温度的升高有效应力路径有一定的扩张;临界状态参数M随温度升高而线性增大;模拟结果与试验结果较为吻合。In order to examine the temperature effect on the critical state parameters of soft clay, triaxial tests of the Ningbo soft clay at different temperatures and confining pressures are carried out, and variation in the critical state parameter at different temperatures are obtained. The tests are also simulated and verified. The results show that the stress-strain curves at different temperatures show a significant hardening form. With the increasing temperature, the shear stress of the soil mass failure increases, but the pore pressure produced by shear reduces. The curves of effective stress paths at different temperatures are similar, and with the increasing temperature, the effective stress paths expand to some extent. The critical state parameter M increases linearly with the inceasing temperature. The simulation results are in good agreement with the experimental results.

关 键 词：软黏土 温控三轴试验 应力路径 临界状态参数M 

分 类 号：TU431[建筑科学—岩土工程]