土体本构模型对软土场地基坑开挖模拟结果的影响分析

Influence analysis of different soil constitutive models on simulation results of soft soil foundation pit excavation

基坑在开挖过程中会产生卸荷作用,因此在数值模拟中合理的选择土体的本构模型是一项十分重要的工作。结合上海某深基坑工程,通过大型通用有限元软件ABAQUS模拟了该基坑开挖的整个过程,分别采用线弹性模型、摩尔—库仑模型及修正的剑桥模型进行计算分析,对不同土体本构模型下的模拟结果进行了对比分析。

The foundation pit will have an unloading effect during the excavation process.Therefore,it is very important to select the constitutive model of the soil in the numerical simulation.In this paper,combined with a deep foundation pit project in Shanghai,the whole process of excavation of the foundation pit is simulated by the large-scale general finite element software ABAQUS.The simulation results under the linear elastic model,the Mohr-Coulomb model and the modified Cambridge model are respectively simulated and comparatively analyzed.