新型装配扶壁式挡土墙结构特性有限元分析

新型装配扶壁式挡土墙具有环保美观,施工速度快的优点,但存在新老混凝土结合面及拼接缝,影响结构整体性。结合宿迁市马陵河整治工程,采用有限元法,分析研究了该挡土墙结构的应力、位移和变形特性及新老混凝土结合面参数对结构受力性态的影响。结果表明,新老混凝土结合面剪应力小于抗滑力,剪切变形很小,属弹性变形,结合面黏结良好;拼接缝处面板拉应力远小于混凝土抗拉强度;新型装配扶壁式挡土墙拉应力较大区域分布于扶壁上端与预制板连接处、扶壁前端与底板连接处及面板与底板连接处,最大值为1.15 MPa,小于混凝土抗拉强度设计值;挡土墙变形及位移均很小,满足应用要求;不考虑结合面黏聚力时,结合面摩擦系数在0.5以上,结构强度均能满足要求。该工程新型装配扶壁式挡土墙安全性满足要求,技术方案是可行的,可推广应用,成果可供设计和施工参考。

Finite element analysis of the structural characteristics of new assembly buttressed retaining wall

New assembly buttressed retaining wall is environmentally friendly, beautiful, and can be constructed rapidly, but the adjoining faces between the old and new concrete and the joints can affect the integrity of the structure. Based on the renovation project of Maling river in Suqian city, we analyzed the characteristics of the stress, displacement, and deformation of the wall and the influence of different parameters of the adjoining faces on the loading behavior of the structure using the finite element method. The results showed that the shear stress of the adjoining faces is smaller than the anti-sliding force and that the elastic shear deformation is very small and belongs to the elastic deformation. The tensile stress in the joint is far less than the tensile strength of the concrete. There is greater tensile stress in the junctions between the upper end of the buttress and the precast slab, between the front end of the buttress and the floor, and between the panel and floor. The maximum tensile stress is 1.5MPa, less than the design tensile strength of the concrete. The deformation and displacement of the retaining wall are small and meet the application requirements. Without regard to the cohesion of the adjoining face, the friction coefficient of the adjoining face is more than 0.5. The new assembly buttressed retaining wall of the project meets the safety requirements. The technical scheme is feasible and applicable. The analysis results can provide reference for design and construction.