Study on the Shearing Strain of the Semi-Rigid Base Asphalt Pavement under Moving Load

To study the premature disruption of the semi-rigid base asphalt pavement,a multi-layer viscoelastic dynamic model where the vehicle load is handled as moving load was used to analysis the dynamic response of the typical semi-rigid base asphalt pavement,and the influences of the axle load,the vehicle speed and the tire pressure on the shearing strain at the bottom of the AC layer and the shearing strain distribution in the AC layer were studied.It showed that the shearing strains increase with the increase of the axle load and the tire pressure,and increase with the decrease of the vehicle speed.Especially,when the axle load is rather small,the destory of the vehicle exerting on the pavement is mainly took place at the wearing surface layer and the middle surface layer, while when the axle load is rather big,the destory is mainly set at the middle surface layer and the low surface layer.The tire pressure has a notable influence on the shearing strain at the depth range from 2cm to 8cm.With the increase of the tire pressure,the depth where the maximum shearing strain occures becomes shallower.