地铁车站深基坑开挖及围护结构变形模拟分析

Deformation Simulation Analysis of Deep Foundation Pit Excavation and Supporting Structure of Metro Station

依托佛山市南海广场站车站明挖深基坑,运用FLAC 3D软件进行了开挖与支护模拟分析.对比分析部分实测与模拟结果,详细介绍模型建立过程,计算过程中土体本构采用了摩尔-库伦弹塑性模型来模拟,基坑围护结构地连墙采用实体单元,其与土体之间接触面运用接触单元,支撑采用beam单元.计算研究不同工况的地表沉降、围护结构水平位移及坑底隆起,得到其变化规律,为工程设计及施工提供一定参考.

Relying on open excavation deep foundation pit of Foshan Nanhai Plaza station,the simulation analysis of excavation and support is carried out by using FLAC 3D software.The process of model establishment is introduced in detail,and comparison and analysis of the measured and simulated results are conducted.In the calculation,the soil constitutive model is modeled by Mohr-Coulomb elastoplastic model,and the solid element is used in the retaining structure of foundation pit.Contact element is used for contact surface,and beam element is used for support.The surface settlement and horizontal displacement of enclosure structure under different working conditions are calculated and studied,and the variation law is obtained,which provides a reference for engineering design and construction.