层间界面条件变化对半刚性基层沥青路面结构性能的影响

Influence of Interlayer Interface Condition Change on Structural Performance of Asphalt Pavement with Semi-rigid Base

摘要:

针对半刚性基层排水性能较差的特点，若渗入沥青层的水分不能从基层迅速排走，将会滞留在基层表面，软化基层表面，在车辆荷载的作用下形成泥浆，使沥青层与基层之间的界面条件从连续状态变为滑动状态或者是半连续半滑动状态。本文采用弹性层状体系理论计算分析了层间接触状况发生变化时，路面结构的力学响应及弯沉的变化情况。结果表明：当界面条件从连续状态变为滑动状态的过程中，荷载中心处的面层层底应力逐渐由压应力变为拉应力，路表弯沉逐渐增大，极易引起路面结构开裂破坏。

Abstract:

In view of the poor drainage performance of semi-rigid base course, if the water infiltrated into the asphalt layer cannot be quickly drained from the base course, it will stay on the base course surface, soften the base course surface, and form the mud under the action of vehicle load, which will make the interface condition between the asphalt layer and the base course change from the continuous state to sliding state or semi continuous and semi sliding state. The elastic layered system theory is used to calculate and analyze the mechanical response and deflection change of pavement structure when the interlayer contact condition changes. The results show that when the interface condition changes from the continuous state to the sliding state, the stress at the bottom of the surface layer at the load center gradually changes from the compressive stress to the tensile stress, which is very easy to cause the cracking and destruction of the pavement structure.