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隧道建设(中英文) ›› 2011, Vol. 31 ›› Issue (S1): 192-196.

• 研究与探索 • 上一篇    下一篇

粉质黏土在不同应力路径下剪切变形特性研究

王晓艳1,2,陈峰1,3,蔡永昌1,2   

  1. ( 1.同济大学土木工程学院地下建筑与工程系,上海 200092; 2.同济大学岩土及地下工程教育部重点实验室,上海 200092; 3.广东省电力设计研究院, 广州 510663)
  • 收稿日期:2011-03-29 修回日期:2011-04-26 出版日期:2011-08-05 发布日期:2011-11-04
  • 作者简介:王晓艳(1987—),女,硕士研究生,主要从事隧道及地下建筑工程研究。

Research on Characteristic of Shear Deformation of Silty Clay in Different Stress Paths

WANG Xiaoyan1,2, CHEN Feng1,2, CAI Yongchang1,2   

  1. (1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Guangdong Electric Power Design Institute, Guangzhou 510663, China)
  • Received:2011-03-29 Revised:2011-04-26 Online:2011-08-05 Published:2011-11-04

摘要: 针对无锡地区代表性的原状粉质黏土,模拟基坑开挖不同应力路径条件,探索土体在不同应力路径条件下的应力-应变状态规律,为合理选择本构关系和合适参数提供基础。通过对无锡地区代表性的原状粉质黏土进行不同应力路径的模型试验,将得到的应力应变双曲线图归一化,采用HSS模型对试验进行模拟,并与试验结果作对比。得出:无锡粉质黏土具有明显的非线性特性,不同应力路径对土体的变形及强度有着显著的影响。HSS模型计算土体应力应变时,模型会根据加卸载状态选择相应的模量,能够更好地模拟无锡粉质粘土的不同应力路径对初始模量的影响。

关键词: 应力路径, 三轴试验, 初始模量, 本构模型

Abstract: In view of the typical undisturbed silty clay in Wuxi, model tests on different stress paths are conducted. The result of the tests shows that, for silty clay in Wuxi, the stressstrain curve of side unloading can be denoted by hyperbola, and different stress paths have significant impact on deformation and strength of soil. The comparison study of numerical analysis and test result reveals that HSS model with small strain is superior to simulate the influence of different stress paths on initial modulus.

Key words: stress path, triaxial test, initial modulus, constitutive model