异形深基坑支护设计与变形特性分析

Characteristic Analysis of Supporting Design and Deformation of Special-Shaped Deep Excavation

受地下空间及主体结构功能需求,异形深基坑在基坑工程建设中运用日益广泛.针对该类型基坑的工程特性,以南昌市某典型的异形深基坑项目为依托,阐明基坑围护体系形式及支护控制要点.并采用MIDAS/GTS NX有限元分析软件建立基坑三维仿真模型,探讨基坑围护结构变形及周边地表沉降规律.通过有限元数值计算结果,验明该围护体系在工程中可有效适应异形基坑的支护变形特性,并积极抵抗基坑侧向变形,为异形深基坑提供优质的安全保障.

Influenced by the demand of the underground space and its main structure and function,special-shaped deep excavation has been widely applied in the excavation construction.This paper targets on the engineering characteristics of the excavation and adopts some deep excavation project in Nanchang as an example to proceed the study on its supporting form and design idea.The MIDAS/GTS NX finite element analysis software has been used to establish the three-dimensional simulation model of excavation to explore the deformation of the retaining structure of excavation and the settlement law of surrounding lands.According to the computation of finite element value,it is testified that this supporting form can effectively resist the excavation deformation in the engineering and provide favorable supporting effect for the special-shaped deep excavation.