Experimental study on the influence of vehicle speed on the dynamic response of asphalt pavement

Field trials;  asphalt pavement;  dynamic response;  speed;  strain ratio;  Fatigue life

Through field field tests, the dynamic strain response of each layer of asphalt pavement under the load of moving vehicles was detected. The influence of vehicle speed on the dynamic response of asphalt pavement structure was studied by using the kinetic strain at the bottom of the surface layer to analyze the object. The results show that the dynamic strain at the bottom of the surface layer includes both tensile strain and compressive strain, and it is in a tensile-compressive strain alternating state, and the fatigue life of asphalt concrete under a certain stress is more different than that under simple tensile stress. With the increase of vehicle speed, the maximum tensile strain and strain amplitude showed a downward trend, and the maximum pressure strain and strain ratio showed an overall upward trend. The destructive effect of heavy-duty vehicles on the road surface at low speed is more serious. The strain ratio is affected by both axle load and speed