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

Dynamic water pressure is the most important factor of water damage of asphaltpavement. It is the road surface water that caused dynamic water pressure and roaddamage. As time goes on, the damage will expand in different direction, depth andextent. Water damage not only reduce the service level of the road, shorten its servicelife, but also bring huge economic loss. Therefore, researching the rainwater erosionprocess and failure mechanism of asphalt concrete pavement has theoretical andengineering significance. In this passage, we will study this from the followingaspects：formation of dynamic water pressure，permeability test of asphalt mixture,hydrodynamic pressure distribution under dynamic water pressure in AsphaltPavement, dynamic finite element analysis of asphalt pavement under water pressure,spelling mechanism research and prevention measures of Asphalt mixture.Dynamic water pressure is the research target of this project. First of all, weshould calculate the number of dynamic water pressure under road surface runoff, andreveal the spelling mechanism of road surface material under this pressure. Then weshould analysis dynamic water pressure in pavement structures, and discus scour andtearing effect inside concrete. At last, we can reveal the spelling, loose and internalfission of asphalt pavement.On the basic of domestic and foreign research, we can analysis the distributionlaw of pore water pressure by the combination of indoor test and numerical simulation,and research mechanical response under saturated state. The varying-head infiltrationinstrument is made by ourselves. We can test the permeability coefficient ofSMA-13,AC-16and AC-20and build Asphalt pavement seepage field under saturatedstate with this instrument. Based on the fluid–solid coupling theory and Layeredelastic theory, we use the finite element software ABAQUS to simulate pore waterpressure inside asphalt pavement structure, vertical stress, maximum shear stress andthe distribution law of vertical displacement in the traffic loads. Then we can analysisthe asphalt pavement structure damage under dynamic water pressure and preventionmeasures with the asphalt adhesion-scaling theory.