Estimation Of Hydrodynamic Pressure On Asphalt Pavement Based On CEL Method

The phenomenon of water damage in asphalt pavement is caused by the existence of hydrodynamic pressure,hydrodynamic on asphalt pavement will generate under the interaction of driving load,surface water and pavement in rainy days.Then hydrodynamic pressure forces the water into the asphalt pavement structure,combined with the vehicle load repeated eventually leaded to the occurrence of damage of the asphalt pavement.Under the load on the pavement,dynamic water scour of asphalt pavement leaded to strip of asphalt membrane and exfoliation of mineral particles,was an important cause of generating the rut under traffic.The scour,pump suction,mutual extrusion of internal pore water pressure oppressed free water continued to flow into the pavement structure,thus made the porosity of internal structure increase gradually,pavement structure intensity was abated,eventually the integrity of the pavement structure was destroyed,led to a decline of the quality of road,there would occur the traffic hazard.Therefore,the study of hydrodynamic pressure was a great significance for analyzing the water damage mechanism of asphalt pavement.This paper aimed to study the hydrodynamic pressure,used ABAQUS software to establish the simplified tire model and to verify the feasibility of tire using,CEL algorithm was used to establish the finite element model of tire-water-road based on the fluid-structure interaction theory,made the combination of better.The speed of the tire rolling(40km/h,60km/h,80km/h,120km/h)and the thickness of the water film(5mm,10mm and 15mm)were simulated to analyze the variation rules of the hydrodynamic pressure of asphalt pavement under different conditions.The results showed that the hydrodynamic pressure increases with increase of thickness of water film,and a non-linear increase with the increase of the speed in the impervious conditions.Then this paper expounded the asphalt pavement disease classification,including subsidence,cracks,water damage,rutting,and analyzed their respective characteristics,and future established fluid-solid coupling model of asphalt pavement with cracking.The changes of hydrodynamic pressure under different crack width(3mm,8mm and 15mm)were analyzed.The results showed that with the wider crack width,the dynamic water pressure gets greater.the wider the crack width,the greater the dynamic water pressure.Based on the analysis results,this paper also had carried the research of stress field on the cracking pavement,suggested that the greatest stress exerted on surface of the crack tip,with the change of the speed and water film cutting-edge law of maximum stress approximate linear increase.The work of this paper made the correlative analysis about influencing factor of hydrodynamic pressure of the road surface and pavement cracking,got the basic change rule,provides reference value for the road design and disease prevention.