Study On Unsaturated Hydraulic Asphalt Concrete Pavement Internal Hydrodynamic Pressure Distribution

Environmental and traffic loads directly on the pavement structure, and theever-changing nature of industrial civilization destined to continue to move forward thecomplexity of these effects. Resulted in increased levels of highway speed increase,making the hydrodynamic pressure into the factors that can not be ignored. While it ismore or less aware of the dynamic role of water, but it is neither knew the size of thehydrodynamic pressure, do not know the role of hydrodynamic pressure process. In fact,the role of dynamic water issue, it is difficult to give a very confident answer.This article aims to reveal the interior of asphalt concrete pavement hydrodynamicpressure distribution, first introduced the theory of porous media, the asphalt pavementseepage were analyzed, and that the asphalt concrete seepage line with Darcy’s law,which independent research indoor variable head permeameter, By flow experiments,obtained porous asphalt concrete at different levels of the permeability coefficient,porosity and permeability of the relationship between the coefficient. Finally, theexperimental data collected using the ABAQUS finite element software rainfallinfiltration seepage field simulation.Main conclusions are as follows:①The hydrodynamic pressure and water skiing on the analysis of thephenomenon and the theoretical calculation of hydrodynamic pressure, water pressurewas dispatched with vehicle speed proportional to the square, which is accompanied bythe exponential growth in vehicle speed.②combining Darcy’s law, made the variable head permeameter, cement wallswith anti-sealing, a good solution to the ever falling head permeameter sidewall leakageproblem, and has been improved penetration tester developed a pressure osmometer.③The gap-graded the SMA-13, continuous gradation of AC-16and AC-20penetration test specimens, the experimental results showed that: the porosity of lessthan7%, the specimen basic watertight, porosity greater than8%, the gap-graded theSMA-13is higher than the permeability coefficient of continuous gradation of AC-16rather than continuous gradation of AC-20, can be seen from the size of the coefficientof permeability with gradation type skeleton structure and the maximum particle sizeand the fine aggregate, the more the gap is filled mixture, the more, the lower theporosity. 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 thenominal maximum particle size increases, the mixture permeability increaseaccordingly.④through the ABAQUS finite element software to simulate the process ofrainfall infiltration process of change within the pavement structure, respectively, tosimulate the vertical stress distribution, soil equivalent plastic strain distribution, porepressure distribution, when the rain began, with asphalt pavement structure rainfall timeincreases, the internal structure of the road a significant change, vertical stress, soilequivalent plastic strain, pore pressure is increased rapidly with the continuing rainfall,if coupled with the vehicle load on the pavement structure will have a devastatingimpact.