行车荷载作用下高模量沥青路面力学响应数值模拟  

Discrete Element Modeling of Mechanical Response of High-modulus Asphalt Pavements Under Vehicle Loads

作　　者：陆学元 彭勇[2] 王重阳 夏舜 孟会林[3] LU Xueyuan;PENG Yong;WANG Chongyang;XIA Shun;MENG Huilin(Anhui Transportation Holding Group Co.Ltd.,Hefei 230088,China;Institute of Transportation Engineering,Zhejiang University,Hangzhou 310058,China;Hebei Provincial Communications Planning and Design Institute,Shijiazhuang 050011,China)

机构地区：[1]安徽省交通控股集团有限公司,合肥230088 [2]浙江大学交通工程研究所,杭州310058 [3]河北省交通规划设计院,石家庄050011

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第6期1168-1174,共7页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：安徽省交通控股集团有限公司交通强国试点项目(2021DFABZ02474)。

摘　　要：文中基于三维离散元法,建立考虑温度梯度和疲劳损伤的高模量沥青路面和SBS改性沥青路面离散元模型,模拟行车荷载作用下路面车辙深度、路面内剪应力和横向应变,对比研究行车荷载作用下高模量沥青路面力学响应.结果表明:荷载作用次数、温度和沥青面层材料对行车荷载作用下沥青路面力学响应有显著影响.沥青路面力学响应随着荷载作用次数的增加而增加,温度越高,沥青路面力学响应越大;不同路面结构的力学响应不同,但在低温下其差异很小;在相同温度下,尤其是在高温下,高模量沥青路面力学响应低于SBS改性沥青路面.此外,轮心下的剪应力和横向应变沿沥青路面深度方向而变化.剪应力沿路面深度方向先增大后减小,横向应变随路面深度方向单调递减;相对于SBS改性沥青路面,高模量沥青路面中最大剪应力出现位置距离路表更近.Based on the three-dimensional discrete element method,discrete element models of high modulus asphalt pavement and SBS modified asphalt pavement considering temperature gradient and fatigue damage were established to simulate the rutting depth,internal shear stress and lateral strain of pavement under traffic load.The mechanical response of high modulus asphalt pavement under driving load was compared and studied.The results show that the frequency of load,temperature and asphalt pavement material have significant effects on the mechanical response of asphalt pavement under driving load.The mechanical response of asphalt pavement increases with the increase of load times.The higher the temperature,the greater the mechanical response of asphalt pavement.The mechanical response of different pavement structures is different,but the difference is very small at low temperature.At the same temperature,especially at high temperature,the mechanical response of high modulus asphalt pavement is lower than that of SBS modified asphalt pavement.In addition,the shear stress and transverse strain under the wheel center change along the depth direction of asphalt pavement.Shear stress first increases and then decreases along the depth direction of pavement,and transverse strain monotonically decreases along the depth direction of pavement.Compared with SBS modified asphalt pavement,the location of maximum shear stress in high modulus asphalt pavement is closer to the road surface.

关 键 词：道路工程 高模量沥青路面 力学响应 三维离散元法 温度梯度 疲劳损伤 

分 类 号：U414[交通运输工程—道路与铁道工程]