基于黏弹性模型的长大纵坡路段力学响应分析  

Study on Mechanical Response of Steep Longitudinal Slopes Based on Viscoelastic Model

作　　者：欧阳汛 张少强 汤维宇 蒋晨晨 OUYANG Xun;ZHANG Shaoqiang;TANG Weiyu;JIANG Chenchen(Power China Roadbridge Group Co.Ltd.,Beijing 100088,China)

机构地区：[1]中电建路桥集团有限公司,北京100088

出　　处：《武汉理工大学学报（交通科学与工程版）》2023年第4期736-741,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：中电建路桥集团有限公司科技项目(HHZ-JGY-FW-05)。

摘　　要：文中基于动态模量试验,确定了AC-13、AC-20和AC-25沥青混合料的松弛模量及松弛模量主曲线,根据松弛模量确定了黏弹性参数,创建可以模拟水平荷载和竖直荷载移动的有限元模型.结果表明:与横向剪应力、纵向剪应力相比,最大剪应力可以更好的表征路面的受力情况;最大剪应力的峰值通常出现在路面的上中面层;行车速度、水平力,以及温度对路面内部最大剪应力的影响程度分别为:水平力、温度,以及行车速度.建议,以及采取控制超载、对下坡路段上中面层材料进行特殊设计等方式,减少路面内部的剪应力,从而达到防治车辙的目的.Based on the dynamic modulus test,the relaxation modulus and the main curve of relaxation modulus of AC-13,AC-20 and AC-25 asphalt mixtures were determined,and the viscoelastic parameters were determined according to the relaxation modulus,and a finite element model which can simulate the movement of horizontal load and vertical load was established.The results show that compared with transverse shear stress and longitudinal shear stress,the maximum shear stress can better characterize the stress of pavement.The peak of the maximum shear stress usually appears in the upper middle layer of the pavement.The influence degrees of driving speed,horizontal force and temperature on the maximum shear stress in pavement are:horizontal force,temperature and driving speed respectively.It is suggested that overload control and special design of the upper and middle surface materials on downhill sections can be adopted to reduce the shear stress inside the pavement,so as to achieve the purpose of preventing rutting.

关 键 词：长大纵坡 黏弹性模型 有限元 最大剪应力 水平力 

分 类 号：U416.2[交通运输工程—道路与铁道工程]