Sensitivity Study on Factors Influencing Pore Water Pressure of Asphalt Pavement
[Purposes]This paper aims to study the sensitivity of the influencing factors of pore water pres-sure of asphalt pavement.[Methods]This article adopts numerical simulation method and uses COMSOL finite element software to establish a full-scale model of pavement structure based on fluid-structure coupling theory.The sensitivity of surface modulus,permeability coefficient,vehicle speed,and axle load to pore water pressure is analyzed.[Findings]The numerical simulation results show that the pore water pressure decreases with the increase of surface modulus,and increases with the increase of vehicle speed and axle load.However,the pore water pressure first increases and then decreases with the change of per-meability coefficient,and with a permeability coefficient of 1×10-6 m/s,the maximum positive pore water pressure occurs.Among the four influencing factors,the surface modulus and vehicle speed have a simi-lar and relatively small impact on pore water pressure,while the permeability coefficient and axle load have a similar and relatively large impact on pore water pressure.[Conclusions]According to the ampli-tude results of the influence of pore water pressure,it can be concluded that the sensitivity of pore water pressure to various factors is ranked from high to low as permeability coefficient,axle load,vehicle speed,and surface layer modulus.
asphalt pavementfluid-structure couplingpore water pressurenumerical simulation
万方数据
维普
