软土地基地下调蓄池深基坑设计研究

Study on Design of Deep Foundation Pit of Storage Tank under Soft Soil Base

摘要:

主要介绍了上海某软土地基地下调蓄池的深基坑设计方案，并采用有限元方法计算分析了基坑开挖对周边环境的影响。该基坑开挖深度16.5~18.1 m，采用地下连续墙围护，水平支撑采用一道钢筋混凝土支撑，三道钢支撑系统，坑内设置格构立柱。计算结果表明：基坑支护整体稳定性、抗倾覆稳定性、抗隆起稳定性、抗承压水稳定性安全系数，围护结构强度和变形满足规范要求。对周边环境影响分析结果表明，基坑开挖引起周边房屋基础的内力和变形均在规范允许范围内，基坑施工不会影响周边房屋结构的安全，基坑设计方案安全可行。

Abstract:

The design scheme of deep foundation pit of storage tank under the soft soil base in Shanghai is mainly introduced, and the influence of foundation pit excavation on the surrounding environment is calculated and analyzed by the finite element method. The excavation depth of the foundation pit is 16.5~18.1 m. The diaphragm wall is used for protection. The horizontal support is used of a one-reinforced concrete support and three-steel support system. The lattice stand column is set in the pit. The calculation results show that the overall stability, anti-overturning stability, anti-uplift stability and anti-confined water stability safety factor of the foundation pit support, and the strength and deformation of enclosing structure all meet the code requirements. The influence analysis on the surrounding environment shows that the internal force and deformation of the surrounding building foundation caused by the foundation pit excavation are within the allowable range of the code. And the construction of the foundation pit will not affect the safety of the surrounding buildings. The design scheme of the foundation pit is safe and feasible.