某顶管工作井软土深基坑支护设计探析

Design and Analysis of a Soft Soil Deep Foundation pitSustaining in a Pipe Jacking Working Well

以福州市某顶管工作井软土深基坑项目为背景,针对项目基坑开挖深度深、地质条件差、周边环境复杂、顶管施工条件要求高等技术难点,分析探讨基坑支护设计方案所采取的解决措施,同时采用有限元软件Plaxis模拟计算基坑支护结构的受力变形情况。监测结果表明,基坑施工期间,支护结构受力变形正常,基坑开挖对周边环境的影响在规范允许范围之内。本项目安全顺利实施,可为类似软土深基坑工程提供参考。

Based on the soft-soil and deep-foundation pit project of a pipe jacking working well in Fuzhou,this article analyzes the corresponding solutions taken by the support design scheme for the foundation pit in terms of the technical difficulties of the project,such as deep excavation depth of the foundation pit,poor geological conditions,complex surrounding environment and high requirements for pipe jacking construction conditions.Additionally,this article simulates and calculates the stress and deformation of the foundation pit support structure by using the finite element software Plaxis.The monitoring results show that during the construction of the foundation pit,the stress and deformation of the support structure are normal,and the impact of foundation pit excavation on the surrounding environment is within the allowable range of the specification.The safe and smooth implementation of the project can provide reference for similar soft-soil and deep-foundation pit projects.