| The results of the moisture damage of the asphalt pavement are mainly caused by the pavement structure load-seepage-damage multi-field coupling effect,which is under the traffic loads.At present,there are many researches are carried about the mechanics response of asphalt pavement which under vehicle load,but the study of the load-seepage coupling effect is less.And under the action of traffic load,whether the Darcy’s law is comply to the saturated asphalt pavement is a question.So,on the basis of the research group’s result,the finite element method is main used to numerical analysis the fluid-soil coupling of the satured asphalt pavement.The major research of this paper includes:First of all,the theory of porous media and seepage and the nonlinear finite element method of axisymmetric space are expounded,then an introduction is made on the ABAQUS finite element software.On the basis of the above work,According to the nonlinear seepage law,make use of the existing seepage analysis result of the dam and compare with the simulated calculation,then the nonlinear seepage law can be carried out by the ABAQUS is verified.Second,according to the axisymmetric saturated asphalt pavement structure finite element analysis,the rule of mechanical field of the asphalt pavement,which in the different load models(the uniformly distributed load and the bowl load),different percolation theory(darcy’s law and the Forchheimer non-darcy’s law)are analyzed.It is pointed out that the bowl load and non-darcy seepage theory can more accurately reflect the water damage degree of asphalt pavement,and the mechanical mechanism of moisture damage of asphalt pavement was revealed.Finally,according to the Forchheimer nonlinear seepage law,the analysis of the load-seepage coupling effect of the asphalt pavement is estblished,which under the bowl load.and the factors of surface layer thickness,elastic modulus,vehicle speed,overload and non-Darcy influence coefficient are analyzed on the other mechanical fields.The results show that the non-Darcy influence coefficient and overload have a remarkable effect on the mechanics response of the pavement structure. |
