Nolinear Analysis Of Asphalt Pavement In High-altitude Areas Of Yunnan Province

The semi-rigid base course asphalt pavement is the most highway form in our country at present. But through the investigation it is show that the semi-rigid base easily gives early shrinkage to the suffice layer cracking with the change of temperature and humidity. Then it would produces reflection crack in asphalt surface,results in other diseases and early damage . The grade gravel with strict gradation and construction technology could adopt as the interlayer between the asphalt surface layer and the semi-rigid base course. The graded gravel layer can well solve the problem about severe reflective cracking and poor drainage of semi-rigid pavement in high-altitude areas of Yunnan province. Consider the nonlinearity of granular materials,the paper make nolinear analysis of asphalt pavement in high-altitude areas of Yunnan province. In the same time,give the systems analysis about the material design parameters of graded gravel in this inverted pavement structure.Based on the theory of nolinear analysis , this paper makes use of finite element analysis program ANSYS to research the pavement performance of the inverted pavement structure. Set up the static elastic-plastic model to analyze the stess and strain peculiarity of asphalt surface layer and the inflection of the change of the plastic parameter of graded gravel materials in asphalt pavement. The dynamic visco-elastic-plastic model is set up. The pavement mechanical response under dynamic load has been studied. The pavement mechanical response under a single load and cycle load has been analyzed. At the same time,this paper analyzed the inflection of the plastic parameter and the permanent distortion characteristic. In the last, this paper put forward commendatory numerical value which is the advisable in high-altitude areas of Yunnan province.Because of the reason of especial climate characteristic in Yunnan province and the stiffness modulus of asphalt mixture changing with the temperature, the critical structural response of asphalt pavement under the coupled application of environmental and axle load were simulated. In the last the paper compare the influences of layer conditions and temperature on pavement responses.