富水软土地层深基坑支护方案优化分析

Analysis of optimization of supporting scheme of deep foundation pit in rich-water soft stratum

地铁建设过程中会出现很多问题,如基坑支护结构设计在只追求经济性时忽视工程的安全需求,在过于追求安全性时忽略经济成本,由于基坑地质条件无法在初次勘察时得出精准的结果而导致在施工过程中发现地质条件改变时原设计方案无法满足要求等。因此,对深基坑支护结构变形进行现场实时监测,并对支护结构每次的优化设计进行研究具有重要的工程应用价值。本文从基坑实际施工情况、优化后基坑的监测数据分析以及经济效益等方面,论证了对佛山地铁2号线花卉世界车站深基坑支护体系进行优化的合理性和必要性,对富水软土地层深基坑支护体系优化设计提供了一定的借鉴作用。

In the process of the subway construction, a lot of problems will emerge, such as the ignorance of engineering security for the only pursuit of economy in structure design of foundation pit design, and the ignorance of economic cost for the excessive pursuit of security, as well as in the course of construction, the original design scheme cannot meet the requirements when the geological conditions are changed because the geological condition of the foundation pit is unable to get accurate results in the initial investigation and so on. Therefore, real-time site mo- nitoring was conducted for structural deformation of the deep foundation pit, and the optimization design each time for the support structure has important engineering application value. In this paper, the rationality and necessity for opti- mization of deep foundation pit support system for Huahuishijie Station on Foshan Metro Line 2 are demonstrated in terms of the actual construction of foundation pit and the analysis of the monitoring data and the economic benefit after the optimization of the foundation pit, which provides some reference for the optimization design of deep foundation pit supporting system in rich-water soft stratum.