Mechanical Response of Basalt Fiber Asphalt Pavement with Low Temperature-Load Coupling in Heavy Frozen Areas

摘要

Due to the harsh cold weather conditions in the heavy frozen areas and the increasing number of overloaded vehicles, asphalt pavement distresses occur frequently in the early service period, among which the crack distress is the most prominent, seriously affecting the driving safety and the service life of the pavement. In order to systematically analyze the change law of mechanical response of basalt fiber (BF) asphalt pavement and its crack resistance behavior, the temperature field model under extreme low temperature conditions was established and the mechanical response of pavement structure under the adverse conditions of low temperature-load coupling was calculated and analyzed. Through comparison of the crack resistance mechanics control index, the crack resistance effect of BF asphalt pavement under low temperature-load coupling condition was analyzed. The results show that under the adverse conditions of low temperature-load coupling, the crack resistance mechanical indexes of BF asphalt pavement have improved to different degrees compared with ordinary asphalt pavement. Specifically, the maximum tensile strain at the bottom of the asphalt layer, the maximum shear stress of the asphalt layer, and the maximum tensile stress at the bottom the base layer in the BF asphalt pavement are decreased by 5.5%, 5.51%, and 20.03%, respectively, compared with the ordinary asphalt pavement.