Study on Dynamic Pore Water Scouring of Asphalt Pavement by Mesoscopic Simulation Method

Abstract

Dynamic water scouring caused by high-speed wheel load is an important cause of asphalt pavement water damage, which seriously affects the service life of asphalt pavement. In this paper, the dynamic water scouring simulation calculation model of asphalt pavement was established by mesoscopic level. Through the simulation model, the water scouring phenomenon of saturated and unsaturated pore in pavement caused by high-speed wheel load was discussed and studied, which mainly considered the influence of wheel speed, pore diameter, pore saturation state and other factors. The main conclusions are as follows: The water pressure, velocity and shear force in the pore are positively correlated with the wheel load velocity in both saturated and unsaturated states. The internal water pressure and fluid velocity of large pore are slightly lower than those of small pore, and the smaller the pore size is, the greater the vacuum negative pressure is. In the unsaturated state, the turbulent kinetic energy in the pore is an order of magnitude larger than that of saturated state, and the larger the pore is, the greater the turbulent kinetic energy is, so the water erosion damage of gas-liquid two-phase flowing is more serious than the saturated state.