动载作用下的半刚性基层沥青混凝土路面力学响应分析

发布时间：2018-11-21 20:32

【摘要】：为探讨动载效应作用下沥青混凝土路面的动力响应规律,建立半刚性基层沥青混凝土路面结构三维有限元模型,开展了连续模型与接触模型的力学响应对比,并分析了车辆荷载参数对路表弯沉、面层层底拉应变、基层层底拉应力、路基顶面压应变及面层内剪应力等动力力学响应量的影响规律。研究结果表明:接触模型比连续模型更加符合路面实际工作状态,采用接触模型进行路面动力响应分析更加合理;路面结构各动力响应量随轴重的增加均有显著提高,并且各动力响应量的峰值与荷载大小之间近似呈线性增长关系;随着车速的提高,路表弯沉与面层底拉应变响应逐渐减小,基层层底拉应力先增大后减小,面层内剪切应力逐渐增大;行车速度对路基顶面压应变影响作用较小。
[Abstract]:In order to study the dynamic response law of asphalt concrete pavement under dynamic load effect, a three-dimensional finite element model of asphalt concrete pavement structure with semi-rigid base is established, and the mechanical responses of continuous model and contact model are compared. The influence of vehicle load parameters on the dynamic mechanical responses such as the surface deflection, the tensile strain of the bottom layer, the tensile stress of the base layer, the compressive strain of the top surface of the roadbed and the shear stress in the surface layer are analyzed. The results show that the contact model is more consistent with the actual working state of the pavement than the continuous model, and it is more reasonable to use the contact model to analyze the dynamic response of the pavement. The dynamic response of pavement structure increases significantly with the increase of axle load, and the peak value of each dynamic response quantity increases linearly with the load magnitude. With the increase of speed, the deflection of the road surface and the tensile strain response of the bottom layer gradually decrease, the tensile stress of the base layer first increases and then decreases, and the shear stress in the surface layer increases gradually, and the effect of the driving speed on the compressive strain of the top surface of the roadbed is relatively small.
【作者单位】：西南交通大学土木工程学院;西南交通大学道路工程四川省重点实验室;四川成德南高速公路有限责任公司;
【基金】：四川省交通运输厅科技项目,项目编号2010B28-2 中央高校基本科研业务费专项资金项目,项目编号SWJTU12ZT05
【分类号】：U416.21

【相似文献】