Abstract

The methods available to predict the strain and tension of geogrid are regularly based on two-dimensional condition, however, the three-dimensional deformed shape of geogrid is seldom considered in the literature. This paper proposed an analytical method to calculate the settlement of reinforced piled embankment considering three-dimensional deformed geogrid, in which the arching effect, the bearing capacity of geogrid and subsoil were taken into account. Firstly, three-dimensional deformation formula of geogrid was derived. Then the load transfer mechanism in the reinforced piled embankment was analyzed, including deriving the vertical stress at the base of the embankment, the vertical stress acting on the geogrid and that taken by the subsoil for piles arranged in the square pattern and in triangle pattern. The proposed analytical method can calculate the maximum settlement at the surface of the subsoil directly, and then the vertical stress acting on the subsoil surface, as well as the distribution of vertical stress along the embankment height can be derived. Finally, the proposed analytical method was used to calculate the settlement of two field cases. The difference between the results calculated from the proposed analytical method and the measurements was 19.5% and 9.2%, respectively, which validated the proposed analytical method.

摘要

土工格栅应变和张力的预测方法通常基于二维条件，而文献中很少考虑土工格栅的三维变形形状。本文提出了一种考虑三维变形土工格栅的加筋桩路堤沉降计算分析方法，该方法考虑了拱效应、土工格栅承载力和地基的承载力。首先推导了土工格栅的三维变形公式。然后分析了加筋桩路堤中的荷载传递机制，包括推导了路堤基部的竖向应力、作用在土工格栅上的竖向应力以及方形和三角形布置桩的底土承受的竖向应力。所提出的解析方法可以直接计算底土表层的最大沉降，进而推导出作用于底土表层的竖向应力，以及沿路堤高度的竖向应力分布。最后，将所提出的解析方法用于计算两个现场案例的沉降。从所提出的分析方法计算的结果与测量结果之间的差异分别为 19.5% 和 9.2%，这验证了所提出的分析方法。