深基坑开挖过程及空间效应影响的数值模拟

Numerical Simulation on Space Effect for a Deep Foundation Pit Excavation

摘要:

结合工程实例，利用FLAC3D有限差分法分析软件对某双排桩深基坑的开挖和支护过程进行模拟，分析了开挖过程中土体位移场的变化规律。研究表明，支护结构和土体的空间受力性状、土与支护结构之间的相互作用以及施工开挖过程等均会对支护结构的受力状态和变形特性产生显著影响。此外，还讨论了双排桩之间土体刚度的变化对位移和沉降的影响，表明适当地增加两排桩之间土体的刚度能有效地减小基坑外侧土体的位移。

Abstract:

Using the finite difference procedure FLAC3D to simulate the excavation process of a deep foundation pit by a double-row piles retaining structure, the paper analyzed the change of soil displacement fields in the excavation process. The studies showed that the space mechanics character of retaining structure and soils, the interaction between soil and retaining structure and the excavation procedure obviously affect the displacement and settlement of the retaining structure. The paper also discussed influence of stiffness change of soil between double-row piles on displacement and settlement, the displacement and settlement of lateral soil of foundation pit could be decreased by properly increasing the stiffness change of soil between double-row piles.