TRD工法型钢水泥土搅拌墙的承载变形性状分析

Deformation and bearing characteristics of steel cement-soil wall constructed by TRD method

TRD(Trench cutting Re-mixing Deep wall)工法构建的等厚度水泥土搅拌墙可内插型钢作为基坑止水和挡土结构,在基坑工程实践中得到了越来越广泛的应用。作为两种刚度差异较大材料的组合结构,TRD工法型钢水泥土搅拌墙承载变形性状和作用机理较为复杂,现阶段的工程实践尚缺乏理论计算的支持。以上海典型软土地层为背景,采用三维"m"法对型钢和水泥土的相互作用和承载变形性状进行了理论分析,主要通过对其变形、弯矩分担和局部抗剪的规律研究,对工程设计中的相关问题予以明确,并结合实测工程墙体变形进行了对比。

The constant thickness steel cement-soil wall constructed by TRD method is a new type of retaining structure. It has already widely used in deep excavations. Because of the difference in stiffness between cement-soil and steel, complex interaction between the two materials exists in the steel cement-soil wall. The current engineering practices lack theoretical analysis and calculations. Based on the typical Shanghai soft soil strata, 3D 'm' method is employed to analyze the interaction between cement-soil and steel, and the deformation and bearing characteristics of the constant thickness steel cement-soil wall is introduced, focusing on displacement, distribution of bending moment and local shear resistance. Those issues are also addressed for the design of steel cement-soil wall. Finally, the calculated and in-situ measured lateral displacements of wall are compared.