基于车-路耦合振动状态下沥青路面力学响应

Mechanical response of asphalt pavement based on vehicle-road coupling vibration

利用ABAQUS,建立三维两自由度1/4车辆模型与黏弹性沥青路面模型,考虑橡胶轮胎以及轮胎与路面非线性接触,采用中心差分法求解,并与相关文献对比.结果表明:该模型具有一定可行性;静载作用下,上面层最大竖向压应力为0.402 MPa,1/4车辆动载为0.563 MPa,比静载增大40.05%;A,B和C级路面上面层最大竖向位移分别为0.589,0.698和0.941 mm,C级比A级大59.76%;上面层最大竖向压应力分别为0.497,0.702和0.739 MPa,C级比A级大48.69%;中面层出现最大竖向及横向压应变,下面层出现最大竖向拉应变、最大纵向压应变及最大横向拉应变,土基出现最大纵向拉应变;车速越大,路面响应越小;轴重越大,路面响应越大.

A three-dimensional 1/4 vehicle model with two degrees of freedom and a viscoelastic asphalt pavement model were established by ABAQUS.The rubber tires and the non-linear contact between tire and pavement were considered in the models.The central difference method was used to solve the problems,and the results were compared with the references.The results show that the models are feasible.The maximum vertical compressive stress of the upper layer under static force is 0.402 MPa,and the dynamic load of 1/4 vehicle is 0.563 MPa,which is 40.05%higher than that under static force.The maximum vertical displacements of the upper layers of grade A,B and C pavement are 0.589,0.698 and 0.941 mm,respectively,and the displacement of grade C is 59.76%larger than that of grade A.The maximum vertical compressive stresses of the upper layers are 0.497,0.702 and 0.739 MPa,respectively,and the maximum vertical compressive stress of grade C is 48.69%larger than that of grade A.The maximum vertical and transverse compressive strains are appeared in the middle layer.The maximum vertical tension strain,longitudinal compressive strain and transverse tension strain are appeared in the lower layer,and the maximum longitudinal tension strain is appeared in the soil foundation.The greater the vehicle speed is,the smaller the pavement response is.The greater the axle weight is,the greater the pavement response is.