深基坑支护结构数值模拟及变形分析

Numerical Simulation and Deformation Analysis of Deep Foundation Pit Supporting Structure

以合肥市某深基坑工程为背景,采用非线性有限元分析软件MIDAS/GTS建立了该基坑开挖的三维有限元模型。对基坑开挖的过程进行数值模拟,研究了"围护桩+内支撑"支护方案下,围护结构的变形规律。分析了影响维护结构变形和稳定性的因素,如土体抗剪强度,桩径和桩体嵌入深度。为该工程支护结构的优化设计以及变形控制提供了依据,对类似工程的设计和施工也具有参考价值。

This paper reports a case study of a deep foundation pit in Hefei.The study established a 3Dfinite element model of the foundation pit excavation with nonlinear finite element analysis software MIDAS/GTS.It also simulated the construction process of foundation pit excavation,and studied the deformation of retaining structure under support scheme of＂retaining pile＋support within＂.It then analyzed the factors affecting the deformation and stability of the maintenance structure,such as soil shear strength,pile diameter and pile embedded depth.This paper provides the basis for the engineering optimum design and deformation control of the supporting structure,and has a certain reference value for the design and construction of similar projects.