武汉某基坑支护工程施工监测分析

Analysis on Excavation Monitoring of a Foundation Pit in Wuhan

综合基坑周边环境、工程地质条件与基坑开挖深度等影响因素,对武汉某基坑采用钻孔灌注桩+钢筋混凝土支撑、局部双排桩的支护方案。结合基坑特点并依据相关规范要求制定基坑详细监测方案,对获取的监测结果数据进行支护结构顶部水平位移、深层水平位移、临近高压电塔沉降与支撑轴力变化的分析。分析结果表明,基坑开挖过程中需充分考虑时空效应,支撑的设置对基坑变形有着重要影响。

Considering the surrounding environment,the engineering geological conditions and the excavation depth,the supporting structures of a foundation pit in Wuhan,a supporting scheme of bored pile+reinforced concrete support and partial double-row piles is adopted.The formulating detailed monitoring plan for the foundation pit is based on the characteristics of the foundation pit and according to the relevant specifications.The analysis about the monitoring results includes horizontal displacement at the top of the supporting structure,deep horizontal displacement,settlement of high voltage tower nearby and the axial force of the brace changes.The analysis results show that the time and space effect should be taken into account in the excavation process of foundation pit,and the support setting has important influence on the deformation of foundation pit.