武汉某基坑支护工程设计方案比较分析

Supporting Methods Comparison for a Deep Excavation Project in Wuhan

基坑支护方案应安全适用、保护环境、技术先进、经济合理。结合基坑的周边环境、地质和水文条件、基坑开挖深度等条件对排桩+可回收预应力锚索方案及排桩+钢筋混凝土支撑方案进行对比分析。通过对比发现,于锚索施工后基坑内部空间开阔,便于土方开挖及地下结构施工,排桩+可回收预应力锚索方案在造价和工期方面均优于钢筋混凝土支撑方案。

The general guide lines for the deep excavation supporting project design should be safe, serve for the purposes, en- vironmental friendly, apply the appropriate construction method, and more importantly, be cost effective. Based on the adja- cent constraint and site geotechnical and hydrological conditions, this paper discusses the advantages and disadvantages of the three different excavation supporting methods, namely, secant piles~ re-useable pre-stressed ground anchor with secant pile~ and reinforced concrete internal support. It is concluded that the pre-stressed ground anchor with secant pile method is better o- ver other two methods since it creates larger construction space so that the construction schedule could be met and it is also more cost effective than other methods.