岩土力学2012，Vol.33Issue(4)：1013-1017,5.
考虑主应力轴旋转的基坑开挖应力路径研究
Research on stress path during excavation considering rotation of principal stress axis
摘要
Abstract
Firstly, the concept of stress path is extended by proposing the three-dimensional stress path considering the rotation of principal stress axis. Then the deep analysis of the stress path during excavation is carried out by numerical method. It is shown that whether the horizontal or the vertical stress exhibits characters of unloading during excavation; and the magnitude of unloading of the inner part of foundation pit is larger than that of the outer part of foundation pit, which cause the changes of both stress and rotation of principal stress axis of the inner part of foundation pit are larger than that of the outer part of foundation pit. As the distance from the centre of foundation pit increasing, both the changes of stress and rotation of principal stress axis of the inner part of foundation pit decrease. The effects of excavation on the change of stress and the rotation of principal stress axis of the outer part of foundation pit decrease as the distance from the wall increasing. The main performance of the stress path of the inner part of foundation pit is that the mean compressive stress p and the generalized shear stress q decrease while the rotation angle of principal stress axis or increases. And the main performance of the stress path of the outer part of foundation pit is that q and a increase while p decreases. So on the basis of the main performance of the stress path, the typical stress paths of both inner and outer parts of foundation pit during excavation are obtained to guide the practice design analysis and indoor experiment of foundation pit engineering.关键词
基坑开挖/应力路径/主应力轴旋转/应力变化Key words
excavation/ stress path/ principal stress axis rotation/ stress change分类
建筑与水利引用本文复制引用
应宏伟,李晶,谢新宇,朱凯,周建..考虑主应力轴旋转的基坑开挖应力路径研究[J].岩土力学,2012,33(4):1013-1017,5.基金项目
“十一五”国家科技支撑计划项目(No.2008BAJ06B01-4) （No.2008BAJ06B01-4）
宁波市科技创新团队基金(No.2011B81005). （No.2011B81005）
