施工及环境因素诱发污水处理池差异沉降及渗漏风险

Differential Settlement and Leakage Risk of Sewage Treatment Tank Induced from Construction and Environmental Factors

针对地基变形特征及其引发的大型污水处理池混凝土结构破裂渗漏风险,研究人工降水、开挖与桩基加固、滨海潮汐地下水渗透等条件下的地基变形特性,并建立地基变形基本方程及多因素综合影响下的统一函数表达式.结合上海白龙港污水处理厂工程,分析工程区域施工及环境因素可能产生的地基变形及其对结构受力的不良影响.结果表明:(1)地基变形曲率对结构受力产生直接影响,曲率半径越小,结构的附加应力越大、致裂风险越高;(2)结构高度越大,对地基弯曲变形的反应越敏感;(3)结构抗弯刚度突变处,应力集中程度高、局部应力超限风险增大.

In view of the deformation characteristics of foundation and its caused concrete structure rupture and leakage risks of large sewage treatment tank,the deformation characteristics of foundation under the artificial precipitation,excavation,pile foundation reinforcement and coast tidal groundwater infiltration are studied,and the basic equation of foundation deformation and the unified function expression under the comprehensive influence of multiple factors are established.Combined with Shanghai Bailonggang Wastewater Treatment Plant Project,the foundation deformation possibly caused by the construction and environmental factors of the engineering area and its adverse effect on the structural stress are analyzed.The results show that the curvature of foundation deformation has a direct influence on the stress of the structure.The smaller the curvature radius is,the greater the additional stress and the higher the crack risk of the structure The higher the structure height is,the more sensitive the response to foundation bending deformation is.And the stress concentration degree is high and the risk of local stress overrun increases at the abrupt change of bending stiffness of the structure.