Research on Dynamic Response Characteristics of Flexible Pavement Structure Based on Full-Scale APT
The Accelerated Pavement Test(APT)on the flexible asphalt pavement structure is conducted by the Heavy Vehicle Simulator(HVS)under the condition of room temperature.The dynamic response and long-term performance are investigated to study the effect of different asphalt layer thickness and axle load.The development of rutting curve,rutting depth,and layered settlement in the flexible asphalt pavement structure are investigated.The characteristics of maximum dynamic stress,resilient strain,and cumulative plastic strain of each measuring point of each structural layer are analyzed.These studies aim to reveal the effect of vehicle load and load times on the dynamic performance of the flexible asphalt pavement structure.The results show that the rutting cross section presents a W-shape at double wheel tracks.The maximum rutting depth develops rapidly at first,then increases linearly and finally increases sharply,which can be divided into the compaction stage,creep stabilization stage,and shear failure stage.When the asphalt layer increases to 2 times,the longitudinal and transverse strain at the bottom of asphalt layer,the maximum dynamic stress and resilient strain at the measuring points of each structural layer decreases significantly,and the layered settlement decreases by about 1～1.5 times.The layered settlement of each structural layer under the asphalt layer increases linearly and steeply in the heavy vehicle load stage.The maximum dynamic stress,resilient strain,and cumulative plastic strain at each measuring points show a stepwise increase trend.The vehicle axle load and asphalt layer thickness are the key factors for the deformation and dynamic stress in the flexible asphalt pavement structure.
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