含反射裂纹沥青路面的动力响应分析

考虑了沥青的黏弹性，结合动力学理论，以动态应力强度因子 (dynamic stress intensity factor, DSIF)为表征参量，主要探讨含裂缝沥青路面结构在垂直载荷作用下的动力学特性，其中包括车辆行驶速度、阻尼比、基层回弹模量等因素对 的影响；同时考虑车辆对路面的水平载荷和垂直载荷共同作用下对 的影响。结果表明：车辆高速运行对道路影响要比低速运行影响小；随着阻尼比的增加， 值降低； 的大小对基层模量很敏感，基层模量越大， 值也越大；当有水平载荷与垂直载荷共同作用时， 的峰值有较大提高，而且对道路体系剪应力和拉应力影响显著。

Dynamic response analysis of asphalt pavement with reflective crack

Based on theory of viscoelasticity and dynamics, the performance of dynamic stress intensity factor (KI) is discussed under vertical load with different vehicle velocity, rebound modulus and damping ratio by FEM simulation. The influence of KI with both horizontal and vertical loads is analyzed. The numerical results show that the value of KI decreased with increase of the vehicle velocity and the damping ratios. The value of KI increased rapidly with increasing of the base modulus. The peak point of the KI increased with both horizontal and vertical loads, which would influence the shear stress and tensile stress of the road.