超载对公路复合地基工作性状影响的力学分析

Mechanical Analysis of the Effect of Overloading on Pavement Performance

本文应用有限单元法分析了公路结构体在静荷载作用下的性状,就单层、双层和四层结构体分别简化为平面应力、平面应变和轴对称模型,探讨了不同简化模型对计算结果的影响。得出轴对称模型可用于定量分析,而其它两个模型只能用于定性分析。复合地基厚度变化时,采用轴对称计算模型探讨了静超载对软土地基上高等级公路的影响,给出了复合地基塑性区的演化规律,为道路工程设计提供参考。

Based on the FEM,the performance characteristics of pavement with different layers are analyzed under static load.The plane stress?plane strain and axisymmetric models are adopted during the course of the analysis for pavements with single?double and four layers.It is obtained that the axisymmetric models can be used for quantitative analysis and the other models for qualitative analysis.The effect on the highway located on the soft clay ground is discussed under the static overload using the axisymmetric model when the thickness of the composite foundation is changing.It is given how the plastic zone develops in the composite foundation.Some conclusions may be taken as references to the design of pavement engineering on the soft clay ground.