不同车速下沥青路面结构的动力响应  

Dynamic Responses of Asphalt Pavement Structure to Different Vehicle Speeds

作　　者：李江[1,2] 王晓涛[1,2] 余胜军[1,2] 

机构地区：[1]交通运输部公路科学研究所,北京100088 [2]道路结构与材料交通行业重点实验室,北京100088

出　　处：《公路交通科技》2015年第8期6-11,共6页Journal of Highway and Transportation Research and Development

基　　金：交通运输部西部交通建设科技项目(2011 318 223 1380)

摘　　要：为了更加直观地反映沥青路面结构的真实受力状态,将汽车荷载简化成均布移动荷载,借助大型有限元软件ABAQUS,建立3D动力有限元模型,分析车辆以不同速度匀速通过和刹车状态下路面结构的动力响应。分析结果显示,较低的车速会使路面结构内部产生较大的应力,并且应力随车速减小基本呈现线性增大趋势;刹车过程中产生的较大水平荷载对结构内部应力产生较大影响,尤其是剪应力和水平正应力,因此在刹车比较频繁的区域,增强面层以及层间接触面的抗剪强度和抗弯拉强度,可减少车辙、推移或拥包等病害的出现。In order to reflect the actual stress state of asphalt pavement structure more intuitively, the vehicles loads are simplified to a moving uniform load. The dynamic responses of the pavement structure when the vehicles passing through at different speeds or braking are analysed by the established 3D dynamic FEM and software ABAQUS. The result shows that （1） lower vehicle speed will cause pavement structure produce larger internal stress, and the stress increases almost linearly with the decreasing of the vehicle speed; （2） the larger horizontal loads caused by braking process have a remarkable effect on the stresses in pavement structure, especially shear stress horizontal normal stress, therefore, increasing the shear strength and flexural strength on surface and interlayer contact area can decrease rutting deformation, cutting-slippage and upheaval etc.

关 键 词：道路工程 沥青路面 有限元 动力响应规律 移动荷载 

分 类 号：U416.217[交通运输工程—道路与铁道工程]