平面应变条件下的土拱效应

平面应变条件下的土拱效应 English Version

基金项目: 士点基金项目(20101103110011)

详细信息

Key Lab of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

摘要: 采用试探应力反馈算法，编制有限元子程序，将土的应力路径本构模型嵌入 ABAQUS ，通过对三轴压缩和三轴拉伸试验问题的数值模拟，验证了子程序的精度。基于土的应力路径本构模型，利用二次开发后的 ABAQUS 对轴对称小直径圆形基坑的开挖过程进行了三维有限元分析，研究了中主应力和小主应力方向的变化过程，以及平面应变条件下由中主应力引起的土压力拱的作用规律。
- 关键词：平面应变 /
- 拱效应 /
- 应力路径 /
- 中主应力 /
- 本构模型
Abstract: By using the trial stress return mapping algorithm, a user-defined material subroutine (UMAT) of the constitutive model of soil considering complex stress path is complied. The precision of the UMAT is tested by simulating triaxial compression tests and triaxial extension tests based on ABAQUS. Three-dimensional finite element analysis of excavating small diameter axisymmetric round foundation is carried out by means of the second-developed ABAQUS with the UMAT. The variations of the intermediate principal stress and the minimum principal stress and the laws of soil arch caused by the intermediate principal stress under the plane strain condition are studied.
- plane strain /
- arching effect /
- stress path /
- intermediate principal stress /
- constitutive model

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