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针对半刚性路面(S1)、倒装式路面(S2)和组合式路面(S3)3类典型沥青路面结构,以实体工程为依托,开展不同行车荷载条件下的路面动力响应现场测试,揭示了车辆荷载大小及行车速度对于沥青路面动态应变响应的影响规律。研究结果表明:车辆动态荷载所引起的层底应变响应明显小于静态轴载作用;面层层底应变随车速提高逐渐减小,轴载水平越高,减小速率越快;面层层底应变随轴重增加逐渐增大,且在动载模式下轴重对于应变响应的影响作用较静态荷载更为显著;面层底纵向应变大于横向应变;基层层底应变随轴重增加逐渐增大,而受车速变化的影响作用较小;轴载水平越高,胎压增加对应变响应的影响作用越显著;在车轮动态荷载作用下,胎压对面层底部应变响应的影响作用明显大于静态荷载。
Three types of typical asphalt pavement structure of semi-rigid pavement (S1), flip-mounted pavement (S2) and combined pavement (S3) are tested on the road surface under different driving loads by physical engineering, revealing Influence of vehicle load and driving speed on dynamic strain response of asphalt pavement. The results show that the response of the bottom layer caused by the vehicle dynamic load is obviously lower than that of the static axial load. The bottom layer strain of the surface layer decreases with the increase of the vehicle speed. The higher the axle load level, the faster the velocity decreases. The axial strain increases more with the increase of shaft weight, and the effect of axle load on the strain response is more significant than that of static load in dynamic loading mode. The longitudinal strain at the bottom surface of the surface layer is larger than the transverse strain. But the influence of the change of the vehicle speed is small. The higher the axle load, the more significant the influence of the tire pressure on the strain response. The effect of the tire pressure on the strain response at the bottom of the tire is obviously greater than the static load under the wheel dynamic load.