两级垛式悬臂挡土墙结构特性数值分析

A Numerical Analysis of the Structure Characteristics of Two-Stage Stacked Cantilever Retaining Walls

采用FLAC3d建立两级装配式悬臂挡土墙和相同墙高的扶臂式挡墙分析模型,通过对比两者的应力与变形,研究了两级悬臂式挡墙垛式装配使用的可行性与受力变形特点,并讨论了上、下级墙之间水平距离、上级墙基底埋深以及填土强度指标对挡土墙结构的影响。研究表明,将两级悬臂式挡墙垛式装配使用是可行的;增大上、下级墙的水平间距有利于减小挡墙侧向变形和基底应力;上级墙基底埋深对挡墙的变形影响较小;随着填土黏聚力和内摩擦角的增加,挡墙侧向变形减小,基底竖向应力稍有增大。

FLAC3d is used to establish the analytical model of two-stage cantilever retaining wall and arm retaining wall with the same wall height. Based on the comparison of the stresses and deformations of the two-stage cantilever retaining walls, a research has been carried out on the feasibility of assembling the two-stage cantilever retaining wall and the characteristics of stress and deformation, followed by a tentative inquiry into the effects of horizontal distance between the upper and lower walls, the depth of the upper wall basement and the strength index of the filling on the structure of the retaining wall. The results verifies the feasibility of the assembly of the two-stage stacked cantilever retaining walls. An increase of the horizontal spacing between the upper and lower walls helps to reduce the lateral deformation and stress of the retaining wall;the depth of the upper wall basement has little effect on the deformation of the retaining wall;with the increase of cohesion and internal friction angle of the filling soil, the lateral deformation of the retaining wall decreases while the vertical stress of the basement increases slightly.