土体本构模型及简化模型对基坑开挖变形数值分析结果的影响

Influence of Constitutive Model and Simplified Model on Pit Deformation

基于大型商用专用软件的数值模拟方法已成为基坑开挖稳定性分析的重要手段之一,但对变形的分析研究较少。通过分析基坑开挖引起的地表沉降变形、基坑侧壁水平位移及坑底隆起变形,研究ABAQUS软件内置土体本构模型及二维简化分析模型对基坑开挖数值模拟结果的影响,并给出基坑开挖三维模型简化成二维模型的适用条件,为基于ABAQUS软件的基坑开挖稳定性分析及变形数值模拟提供参考。

In recent years, with the rapid development of computer technology, the numerical simulation methods based on large-scale commercial professional software have become an important method for stability analysis of foundation pit excavations. Among them, the finite element commercial software represented by ABAQUS was widely used in the stability analysis of foundation pit. However, the relevant analysis results show that the influencing factors of the numerical simulation results of the deformation caused by the excavation of the foundation pit were not only determined by the properties of the soil medium and the form of support, etc., but also affected by the soil constitutive and the analytical models.Through the analysis of the surface settlement deformation,the lateral displacement of the foundation pit and the heave deformation of the pit bottom caused by pit excavations, and has discussed the influence of ABAQUS built-in constitutive model and two-dimensional simplified analysis model on the numerical simulation results of foundation pit excavation was discussed. Also,the applicable conditions for simplifying the three-dimensional model of foundation pit excavation to two-dimensional model have been given, in order to provides reference for numerical simulation of foundation pit excavation stability analysis based on ABAQUS.