临近高架的基坑开挖变形特性的数值分析

On numerical analysis of deformation features of excavation of foundation pits near viaduct

以上海地区某深基坑工程为研究对象,考虑土体小应变刚度特性,建立高架道路和临近基坑的二维有限元分析模型,探讨土体小应变条件下深基坑的变形特性及基坑开挖对高架的影响。算例分析表明,考虑土体小应变刚度特性可以较好的模拟基坑开挖的变形及基坑开挖对高架的影响,计算结果与实际情况基本吻合。

Taking some deep foundation pit in Shanghai as the research object,the paper considers the small strain stiffness of soil,establishes the two-dimensional finite element analysis model of the viaduct road and adjoining foundation pits,explores the deformation features of the deep foundation pits under the small strain stiffness of soil,and the influence of the foundation excavation on the viaduct,and proves by the analysis of examples that the features of the small strain stiffness of soil can imitate the deformation of the foundation pit excavation and the influence of the excavation of the foundation pits on the viaduct,and the calculated results are basically consistent with the fact.