结构层模量对半刚性路面结构设计的影响

Effect of Structural Layer Modulus on the Structural Design of Semi-rigid Base Asphalt Pavement

为研究结构层不同模量取值对路面结构设计指标的影响,根据弹性层状体系理论,利用有限元软件分析各路面结构层模量对无机结合料底基层拉应力、沥青混合料分层竖向压应力和路表弯沉的影响。分析表明:为满足无机结合料底基层疲劳寿命的要求,应选择较低的底基层模量、较高的路基模量和中下基层模量。通过提高上面层、中面层模量,减小下面层、上基层模量,降低沥青混合料层永久变形。增大各结构层模量,可减小路表弯沉。

In order to study the influence of different modulus values of structural layer on pavement structure design index,based on the theory of layered elastic system,the influence of modulus of pavement layer on tensile stress of cement treated base,vertical compressive stress of asphalt mixture layer and deflection of pavement surface were analyzed by finite element software.The results showed that in order to meet the fatigue life requirement of cement treated subbase,lower modulus of subbase,higher modulus of subgrade and middle-lower base should be selected;permanent deformation of asphalt mixture layer could be reduced by increasing modulus of upper and middle layers,and permanent deformation of asphalt mixture layer could be reduced by increasing modulus of each structural layer.And increasing the modulus of each structural layer could reduce the surface deflection.