三角形波动载作用下半刚性沥青路面动态响应量三维有限元分析

针对动载条件下半刚性沥青路面结构破坏问题，采用三角形波激励加载，考虑车辆超栽以及车速变化对路面结构动态响应量的影响，利用三维有限元数值法对超载、快速、慢速条件下的路面各结构层动竖向位移和层底动弯拉应力分布规律进行数值分析计算。结果表明，动载条件下，路表所形成的横向弯沉盆影响范围为6．2m，而基层层底沿横向0．35m范围内均承受动拉应力；车速越慢，超载越严重，路表、路基顶面的竖向动位移峰值及动弯拉应力峰值越大，在交通堵塞、长大纵坡的行驶环境中，路面材料的要求更高。

3D FEM Analysis for Dynamic Response of Semi-Rigid Asphalt Pavement with Triangular Dynamic Load

Aiming at the failure problem of semi-rigid asphalt pavement caused by dynamic load conditions,this paper, loaded with the triangle excitation to consider the effect of overload and vehicle speed on dynamic response of pavement structure,analyzes the distribution of dynamic vertical displacement of each structural layer of pavement and dynamic tensile stress at the bottom of each structural layer under the overload,fast, slow conditions by 3D FEM. The results show that the influence scope of transverse deflection basin on pavement surface is 6.2m and base layer bottom endures the dynamic tensile stress along the lateral 0.35 m range under the dynamic load. The slower the speed is and more serious the over load is,dynamic vertical displacement of pavement surface and the top of subgrade will be. In the traffic jams and longitudinal slope driving environment, the performance of pavement materials is required higher.