Study On The Damage Of Asphalt Concrete Pavement Under The Action Of Hydrodynamic Water Pressure

In addition to bringing the convenience of life,there are some negative influences of the technological progress.More and more people have their private cars.A survey shows thatthe numbers of car ownership in China was 130 million,in 2014,almost every 10 people owns a car.At the same time,the increasing levels of road grader ?size of the car,and the overloaded vehicles,make the road disease becaming the public focus.The first major disease of asphalt pavement distress is water damage,water damage of asphalt concrete pavement is the result of interaction of water and the vehicle loads.This paper aims to studying the interior hydrodynamic pressure of asphalt concrete pavement with the effects of the dynamic loads.It introduced the formation and stress analysis of hydrodynamic pressure in asphalt concrete surface layer at first,and then introduced the theory of porous media And the asphalt concrete seepage is suit for Darcy flow law,So we can establish saturated-unsaturated model.of sphalt concrete Pavement Referenced anyone others' experiences,obtained porous asphalt concrete at different levels of the permeability coefficient,porosity and permeability of the relationship between the coefficient.Finally,the experimental data collected using the ABAQUS finite element software rainfall infiltration seepage field simulation.a collected using ABAQUS finite element software on rainfall infiltration seepage field simulation.In this paper,the basic concept is drawing particular unsaturated soil mechanics,that the rain and the rain stopped after the initial asphalt concrete pavement is in fact a non-infiltration and drainage problems under saturation.Main conclusions are as follows:(1)The hydrodynamic pressure and water skiing on the analysis of the phenomenon and the theoretical calculation of hydrodynamic pressure,water pressure was dispatched with vehicle speed proportional to the square,which is accompanied by the exponential growth in vehicle speed.(2)The gap-graded the SMA-13,continuous gradation of AC-16 and AC-20 penetration test specimens,the experimental results showed that: the porosity of less than 7%,the specimen basic watertight,porosity greater than 8 %,the gap-graded the SMA-13 is higher than the permeability coefficient of continuous gradation of AC-16 rather than continuous gradation of AC-20,can be seen from the size of the coefficient of permeability with gradation type skeleton structure and the maximum particle size and the fine aggregate,the more the gap is filled mixture,the more,the lower the porosity.On the other hand,the maximum size is a major factor affecting the porosity,the greater the maximum particle size,the greater the porosity between.So with the nominal maximum particle size increases,the mixture permeability increase accordingly.(3)The compaction of the surface layer of rainwater infiltration is the most obvious.The reducing of compaction has a great influence of rainwater infiltration,of the surface layer It makes a lot of rain water into the embankment.So the compactness is essential to prevent rainwater from entering the road.(4)Through the ABAQUS finite element software to simulate the process of rainfall infiltration process of change within the pavement structure,respectively,to simulate the vertical stress distribution,soil equivalent plastic strain distribution,pore pressure distribution,when the rain began,with asphalt pavement structure rainfall time increases,the internal structure of the road a significant change,vertical stress,soil equivalent plastic strain,pore pressure is increased rapidly with the continuing rainfall,if coupled with the vehicle load on the pavement structure will have a devastating impact.