土体应力-应变关系转型问题分析  

Analysis of problem of pattern transition in stress-strain relations of soils

作　　者：王成华[1] 李广信[2] 

机构地区：[1]天津大学建筑工程学院土木工程系,天津300072 [2]清华大学土木水利学院水利水电工程系,北京100084

出　　处：《岩土力学》2004年第8期1185-1190,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50279014)。

摘　　要：通过对土体应力应变试验结果的分析,明确指出了土体普遍存在的应力-应变关系转型现象。提出了按后破坏模量和临界围压两个参数判别土体应力-应变关系转型的方法,对影响土体应力-应变关系转型的因素包括土的类型、围压、初始密度或含水率、排水条件及应力路径等进行了简要分析。最后,对砂土初步提出了一个能反映转型现象的组合应力-应变关系模型的理论框架。The pattern transition in stress-strain relations of soils, which is a mechanical phenomenon generally exists in many soils, is revealed for the first time, based on analyzing the data of stress-strain relation tests published in literatures. Two new parameters, post-failure modulus Epost and critical confining pressure σ3cr, are suggested for recognizing the pattern transition of stress-strain relations of soils. The factors influencing the phenomenon of pattern transition such as soil types, confining pressure, initial density or water content, drainage conditions, and stress paths, are briefly analyzed. A combined model for describing the pattern transition in stress-strain relations of sands is schematically suggested.

关 键 词：应力-应变关系 转型 后破坏模量 临界围压 影响因素 

分 类 号：TU43[建筑科学—岩土工程]