路面结构极限承载能力分析

针对某公路路面的早期损坏,进行了超载车辆的轴重及其轮胎接地面积和压力的调查.基于实际轴载的作用图式,分别应用弹性层状体系理论和弹性薄板理论有限元法分析了重荷载作用下,该公路沥青路面和水泥混凝土路面结构的力学响应.按照起决定作用的各结构层材料抗拉强度确定两种路面结构类型的极限承载能力,初步建立了分析路面结构极限承载能力的方法.分析结果表明,沥青路面早期损坏的根本原因是过大轴载对路面结构的一次性加载破坏,而不是轴载重复作用的疲劳破坏,按现行规范设计确定的水泥混凝土路面结构的极限承载能力明显高于沥青路面结构的极限承载能力.

Ultimate Bearing Capacity Analysis of Pavement Structures

Aiming at the premature distresses of a virtual highway pavement,the axle weights of overloading vehicles and tire-pavement contacting areas and pressures were investigated.Mechanical responses of the asphalt pavement and cement concrete pavement structures were analyzed,respectively with multiplayer system elasticity theory program and finite element method(FEM) program for elastic thin slab,based on the actually applied patterns of heavy loading.The ultimate bearing capacity of pavement structures was determined in terms of the ultimate tensile strengths of corresponding pavement materials.Preliminary procedures were established to analyze the ultimate bearing capacity of pavement structures.Analysis showed that the premature distresses of asphalt pavement of the real highway resulted from the damage by excessively heavy axle loading on pavement structure,rather than the fatigue damage by axle loading repetitions,and that the ultimate bearing capacity of cement concrete pavement structure,determined by current specifications for pavement design in China,was higher than that of asphalt pavement structure.