土工格栅加筋挡土墙工作性能的非线性有限元数值分析

NUMERICAL ANALYSIS OF PERFORMANCE OF GEOGRIDS-REINFORCED RETAINING WALLS BY NONLINEAR FEM

针对土工格栅加筋挡土墙发展了有限元数值分析方法,依此对某一足尺试验墙进行具体的有限元数值计算,将计算结果与试验实测结果进行了对比分析,验证了加筋挡土墙结构应力与变形有限元分析的可靠性,进而通过变动填土的强度特性和刚度特性以及加筋的刚度、长度和间距等参数,进行了数值计算,通过对比分析探讨了填土及加筋对土工格栅加筋挡土墙工作性能的影响程度,为加筋挡土墙的设计提供了参考依据。

A numerical nonlinear analysis procedure based on finite element method is developed for the geogrids-reinforced retaining walls. The effects of both backfills and geogrids can be considered in the procedure. A case study for a large-scale test wall reinforced by geogrids, which is well documented by Royal Military College of Canada, is used to verify the reliability of the proposed numerical method. Then a comparative study is conducted for a varied range of parameters involved in the analysis such as deformation and strength properties of backfills and rigidity, length and vertical spacing of geogrids. The influence of these parameters on distribution and variation modes of stresses and deformations of the system are examined based on the computed results. It is shown that the rigidity of geogrids had a considerable effect on the behavior of geogrids-reinforced retaining walls when the backfills are of lower strength and stiffness; and that the geogrids have a limited length when the height of wall is fixed; and that the spacing of geogrids also has an effect on the deformation of the wall face. The performance behavior of geogrids-reinforced retaining wall is further discussed.