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开挖深度在7m以下的软土浅基坑可以根据具体工程条件分别使用钢筋混凝土支撑和钢管支撑、型钢斜抛撑,形成非闭合式支撑体系,通过多种支护方式的组合,完成基坑开挖围护工程。通过上海某软土浅基坑的分区分块组合式设计,对组合式非闭合支撑体系的工程应用进行介绍,分析了钢筋混凝土支撑和钢管支撑以及型钢斜抛撑各自的适用范围和设计要点,基坑设计可根据各个部位的工程情况,进行水泥土搅拌桩重力墙、SMW工法桩等板式围护结构的平面组合式围护体系。通过支撑部位的PLAXIS数值模拟和开挖过程位移监测,对软土基坑的变形特点进行分析和总结,为软土地区类似的大面积浅基坑工程设计提供相关参考和工程经验。
Excavation depth of soft soil shallow excavation below 7m can be used according to the specific conditions of the concrete support and steel pipe support, steel slant throwing support to form a non-closed support system, through a combination of support methods to complete the foundation pit Excavation enclosure works. The engineering application of the combined non-closed support system is introduced through the sub-block combined design of a shallow foundation pit in Shanghai. The applicable scope and design points of the reinforced concrete support and the steel pipe support as well as the inclined support of the steel profile are analyzed. Foundation pit design can be based on the engineering conditions of various parts of the cement soil mixing pile gravity wall, SMW method piles and other plate-type composite retaining wall cladding system. Based on the PLAXIS numerical simulation of the supporting site and the displacement monitoring during the excavation, the deformation characteristics of the soft soil foundation pit are analyzed and summarized, providing relevant reference and engineering experience for similar large-area shallow foundation pit engineering design in soft soil area.