土体应力_应变关系转型问题分析.pdfVIP

第25 卷第8 期 岩 土 力 学 Vol.25 No.8 2004 年8 月 Rock and Soil Mechanics Aug. 2004 文章编号：1000－7598 －(2004) 08 －1185－06 土体应力-应变关系转型问题分析 1, 2 2 王成华 ，李广信 （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 ） 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。 关 键 词：应力-应变关系；转型；后破坏模量；临界围压；影响因素 中图分类号：TU 43 文献标识码：A Analysis of problem of pattern transition in stress-strain relations of soils WANG Cheng-hua1,2, LI Guang-xin2 ( 1. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. School of Civil Hydraulic Engineering, Tsinghua University, Beijing 100084, China) Abstract: The pattern transition in stress-strain relations of soils, which is a mechanical phenomenon generally existed 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 E and critical confining pressure σ , are suggested for recognizing of pattern transition of stress-strain post 3cr relations of soils. The factors influencing the phenomenon of pattern transition such as soil types, confining pressure, initial density or water content, drainage conditions, stress paths, etc., are briefly analyzed. Finally, a combined model for describing the pattern transition in stress-strain relations of sands is schematically suggested. Key words: stress-strain relations; pa