软弱层特性对斜坡软弱地基路堤变形的影响

Influence of Weak Layer Properties on Deformation of Embankment over Sloped Weak Ground

为获得不同软弱层特性条件下斜坡软弱地基路堤的变形规律,建立了斜坡软弱地基在路堤自重荷载作用下的非线性有限元数值模型,探讨了软弱层特性各因素对斜坡软弱地基路堤变形的影响;通过正交试验设计,对软弱层特性各因素对变形影响的显著性进行了评价.结果表明:软弱层土体弹性模量、软弱层厚度是产生过大竖向沉降和侧向变形的决定性因素;地面横坡的存在是加剧地基变形的重要因素;当软弱层位于地基顶面时,对地基变形尤其是侧向变形影响显著;应综合考虑软弱层特性各因素的影响,采取地基处理、侧向约束等工程措施限制变形.

In order to get the deformation characteristics of embankment over sloped weak ground with different weak layer properties, a numerical model was established based on the nonlinear finite element method. The orthogonal design was applied to evaluate the significances of influencing factors. The research results show that the elastic modulus and thickness of a weak layer are the decisive factors affecting vertical settlement and lateral deformation; the lateral slope of ground is an important factor aggravating embankment deformations; when the weaker layer locates on ground top, embankment deformations are significantly affected, especially on lateral deformation. Engineering measures based on weak layer properties, such as foundation treatment and lateral restraint should be adopted to eliminate the deformations.