湘潭市中医医院整体迁建项目基坑支护设计研究

土钉墙+悬臂桩支护是指利用土层锚杆锚固基坑上部土体,同时利用悬臂桩支挡下部土体,两者协同作用,使基坑达到稳定的一种支护技术,它具有经济、有效的特点,运用广泛。在湘潭市中医医院整体迁建项目基坑工程中,根椐场地的工程地质条件、水文地质条件,充分考虑到周边条件,通过分析论证不同的基坑支护方案,选择技术上可行、经济上合理、整体性能好、同时便于基坑支护开挖及后续施工的土钉墙+悬臂桩支护体系。然后对基坑支护结构进行了土压力计算、灌注桩设计、锚杆设计、稳定性的验算,并通过后期变形观测,验证了土钉墙+悬臂桩支护型式对于此基坑是安全经济、适用可行的。

Soil nail wall + cantilever pile support is a kind of support technology that uses soil anchors to anchor the upper soil of the foundation pit and uses cantilever piles to support the lower soil,which can work together in an economical and effective way to make the foundation pit stable,therefore has been widely used.In the foundation pit engineering of the overall relocation project of Xiangtan traditional Chinese medicine hospital,different foundation pit support schemes are analyzed based on the surrounding site conditions such as engineering geological and hydro-geological conditions,so as to select the soil nailing wall + cantilever pile support system which is technically feasible,economically reasonable,with good overall performance,and convenient for foundation pit support excavation and subsequent construction.Then the earth pressure calculation,cast-in-place pile design,anchor rod design and stability checking calculation are carried out for the foundation pit support structure.Through the later deformation observation,it is verified that the soil nailing wall + cantilever pile support type is safe,economical,applicable and feasible for the project foundation pit.