多支撑挡土结构考虑开挖过程的有限元分析方法

Finite element analysis of multi-braced retaining structures with consideration of the effect of staged excavation

针对深基坑开挖中广泛采用的多支撑挡土结构,考虑分步开挖的施工过程对支撑反力、挡土结构内力和位移的影响,提出了以弹性地基梁理论为基础的有限元分析方法,并推导出了各开挖阶段矩阵方程的形式。对工程实例进行了对比分析,计算结果与实测结果非常吻合,证明本文方法理论可靠、使用方便。

Multi-braced retaining structures have been widely used in the deep excavation. A finite element method based on the theory of elastic foundation beam are presented in this paper, with consideration of the effects of staged excavation upon the bracing force and the internal force as well as displacement of retaining structures. Meanwhile, the matrix equations in different stage have been derived. Comparison shows that the results obtained by the proposed method are very closed to the test data, thus the accuracy of the proposed method has been verified.