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为了研究车辆荷载作用下排水基层路面的动力响应,同时考虑车速和轴载的影响,采用移动加载的方法,对不同工况下沥青路面进行了快速Lagrange有限差分分析。结果表明,路面弯沉并未因排水基层的低模量而增大,峰值甚至有所减小;排水基层的存在减小了底基层底部的动应力,可以抑止反射裂缝的产生;弯沉及动应力均随车速的增大而减小,高温季节,低速行驶更容易引起大车辙;当车辆超载50%时,弯沉和动应力均成倍增大,导致路面产生较大变形甚至塑性破坏,且更容易引起路面开裂,表明治理超载对延长道路使用寿命,降低养护成本具有重要意义。
In order to study the dynamic response of drainage pavement under vehicle load, the fast Lagrange finite difference analysis of asphalt pavement under different conditions was carried out by using the method of moving loading considering the influence of vehicle speed and axle load. The results show that the deflection of road surface does not increase due to the low modulus of drainage base and the peak value even decreases. The existence of drainage base reduces the dynamic stress at the bottom of basement, which can restrain the reflection cracks. Dynamic stress decreases with the increase of vehicle speed. In high temperature season, low-speed driving is more likely to cause large rutting. When vehicle overloading 50%, deflection and dynamic stress are doubled, resulting in large deformation and even plastic failure of pavement, And more likely to cause road cracking, indicating that the treatment of overload to extend the service life of the road, reduce the cost of conservation is of great significance.