复杂环境下深基坑桩墙合一逆作法支护设计应用研究

Research on the Supporting Design and Application of Deep Foundation Pits with Pile-Wall Integration and the Topdown Construction Method in the Complex Environment

老城区深基坑周边往往有相当规模的老旧建筑和密集的市政管网,对开挖过程中基坑支护结构变形控制有非常高的要求。针对该深基坑周边复杂环境,采用桩墙合一逆作法的支护结构设计方案,运用理正软件进行计算,并采用通用岩土有限元分析软件(PLAXIS)分析了基坑开挖对周边建筑物和道路的影响。分析结果表明该支护结构方案能够有效保护基坑周边建筑物和道路管线。

There are often quite a large scale of old buildings and dense municipal pipe network around deep pits in old urban areas,and they are very sensitive to deformation,which has a very high requirement for deformation control of deep pit support structure during excavation.In view of the complex environment around the deep pit,the support structure design scheme of pile-wall integration and topdown construction method is adopted.The influence of deep pit excavation on the surrounding buildings and roads is analyzed by using Lizhengsoftware and PLAXIS finite element software.The analysis results show that the support structure scheme can effectively protect the building and road pipeline around the deep pit.