深基坑开挖引起的土体变形模拟

Simulation of soil deformation due to excavation of deep foundation pit

采用FLAC3D软件对某深基坑开挖引起的坑底隆起及地表变形进行了数值模拟.计算中采用摩尔库仑弹塑性模型模拟土体特征,采用接触单元模拟土体与基坑围护结构之间的相互作用.通过模拟开挖过程,获得了不同开挖阶段的地表沉降、坑底隆起和墙后土体水平位移资料,可供工程设计和施工参考.

The uplifts of the bottom of foundation pit and the deformation of the ground surface due to excavation of the deep foundation pit are simulated using the software FLAC3D. During the simulation, the Mohr-Coulomb model is used in soils; and contact elements are used on the interfaces between the structure and soil. The settlements of ground surface, uplifts of the bottom of pit and horizontal displacements of the soil behind the vertical wall at every excavating step are obtained; and the results can be for reference in designing and constructing of foundation pits.