近年来,随着国民经济的发展,我国高速公路得到了迅速的发展,从已建软土地基上高速公路运行情况来看,工后沉降普遍较大。交通荷载作用下路面的沉降变形,一直是工程界普遍关心的问题,也是一值得深入研究的课题。首先建立复合地基的沉降模型,并采用弹塑性土体本构关系,使用有限单元法研究不同的土层组合对沉降量的影响。 In recent years, with the development of the national economy, the expressway in our country has been developed rapidly. From the running condition of the expressway on the already-built soft soil foundation, post-construction settlement is generally large. The settlement deformation of pavement under the action of traffic load has always been a common concern in the engineering field and a subject worth further study. Firstly, the settlement model of composite foundation is established, and the constitutive relation of elasto-plastic soil is established. The influence of different soil layers on the settlement is studied by finite element method.