高速公路上坡路段半刚性沥青路面的三维有限元分析  

Three Dimensional Finite Element Analysis of the Semi-rigid Asphalt Pavement of Upslope in Expressway

作　　者：李雪莲[1] 陈宇亮[2] 张起森[1] 周志刚[1] 

机构地区：[1]长沙理工大学公路工程学院,湖南长沙410076 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《公路交通科技》2007年第8期23-26,共4页Journal of Highway and Transportation Research and Development

摘　　要：运用三维有限元方法,分析了不同道路纵坡下路面结构层层底最大拉应力、层底最大剪应力和土基最大压应变的变化规律,以及上坡路段在不同超载率、路面摩擦系数和温度状况下各主要路面结构力学指标的变化情况,并提出了相应的防治对策。分析结果表明,道路纵坡改变只对面层所受拉力有影响,更易使面层产生开裂;各面层都是剪应力作用的主要集中区域;超载率、路面摩擦系数和温度对上坡路面结构受力都存在不同程度的影响,汽车超载的影响最大。因此,应尽量提高沥青混合料面层的抗拉强度和抗剪强度,并严格限制上坡车辆超载。The regularity of maximum tensile stress, maximum shear stress of the pavement, and the maximum compression strain of the subgrade at different slope is presented by FEM. Then the variation of the main mechanical index under the vary conditions of overload factor, friction coefficient and temperature is analyzed and the corresponding countermeasures are presented. The result shows that the tensile stress of surface is affected by slope change and it makes the surface easier for cracking. The surface shear stress is a major focus of the pavement structure. It also shows that overload factor, friction coefficient and temperature affect the stress of pavement diversely, among which the overload of automobile does the most.So it should enhance asphalt mixture layer tensile and shear strength, and strictly control uphill vehicle overloading.

关 键 词：道路工程 路面结构 有限元法 拉应力 剪应力 压应变 上坡 

分 类 号：U416.223[交通运输工程—道路与铁道工程]