Study On Desing Index Of Heavy-Duty Asphalt Pavement

With the development of national economy and highway traffic, more and more large-scale vehicles are used in the carrier vehicle in our country, and the vehicles which are ultra limit, and overload are also serious, it causes the pavement to be premature damage. The service life and service level of pavement is reduced. Therefore, It is therefore necessary to research the desing index in heavy-duty traffic.Traffic conditions on the Gansu survey trucks, the proportion of heavy vehicles has increased year by year, the early destruction of the road structure is a serious problem, Analysis of the causes of early diseases and the current road structure Gansu problems.The results of research from abroad and put forward under heavy load schema of overloaded methods defined, select the road design standards, axle load. Calculated through the mechanical analysis of the structure of heavy-duty asphalt pavement on the impact of the disease combined with the road survey, heavy-duty asphalt pavement against a variety of damage types of design specifications.Pavement design for the design of the selected indicators, using existing models, namely the establishment of a deflection path, the grass-roots bottom tensile stress, tensile strain at the end surface, earth-based top surface compressive strain, such as rutting equivalent axle load conversion formula.The following layer of heavy-duty, grass-roots, soil-based value for the modulus of the mechanical analysis, the value of the modulus of the discussion, concluding that there use to improve the road surface modulus values of life. Surface of several raw materials with the grass-roots resilient modulus of the experiment, summarized in surface temperature and the modulus of the relationship between the surface modulus and the relationship between the ability of anti-rutting. Modulus of the grass-roots level, through the fatigue of thinking equivalent modulus values under heavy research, analysis of the grass-roots level to accelerate the load testing ground of the decay modulus. Analysis of the resilient modulus of Subgrade pavement structure on the impact of fatigue life, as well as improve the soil resilient modulus-based measures, on-site testing for resilient modulus calculated and analyzed.