淤泥质场地基坑支护与地基处理施工技术

Construction Technology of Foundation Pit Support and Foundation Treatment for Muddy Sites

依托于某市填海造陆区域一大型基坑支护工程,以降低工程造价和优化基坑支护方案为目的,基于建设项目现场地形地貌、水文地质和周边环境等条件,根据环境保护及减少对地下管线、附近地铁建设工程影响等要求,采用“内支撑与咬合桩”支护方案,设置三道混凝土内支撑分摊深基坑外水土压力。同时为满足基坑地层变化和开挖深度要求,将整个基坑分为十三段,根据施工要求分别开展支护施工。最后采用数值模拟探讨了淤泥质场地基坑支护结构变形特征,明确基坑支护要点。

Based on a large-scale foundation pit supporting project in a municipal reclamation area,in order to reduce the project cost and optimize the foundation pit supporting scheme,based on the topography,hydrogeology and surrounding environment conditions of the construction project site,according to the requirements of environmental protection and reducing the impact on underground pipelines and nearby subway construction,the"internal support and occlusion pile"supporting scheme is adopted.Three concrete internal supports are set to share the water and soil pressure outside the deep foundation pit.At the same time,in order to meet the changes of foundation pit strata and the requirements of excavation depth,the whole foundation pit is divided into 13 sections,and support construction is carried out according to the construction requirements.Finally,the deformation characteristics of foundation pit supporting structure in silt site are discussed by numerical simulation,and the key points of foundation pit supporting are clarified.