Reliability analysis of asphalt overlay structure based on finite element

A standard method of squeezing more serviceable years from cracking or rutting asphalt pavement roadways is to lay a new asphalt surface over the old. Such flexible pavement overlays can improve deteriorated pavement and enhance skid resistance, ride quality, and other functional characteristics of the roadway. Pavement rehabilitation is a main active after the highway is accomplished and also has impaction on the high finance and traffic behavior. In the recent years, the volume of traffic has increase greatly, especially in urban area which make a lot of cases of earlier-than-expected failures in highway system. The highway agencies have invested amount of fund on rehabilitation of the highway built in 1990s and 2000s. people still make efforts to develop rehabilitation techniques and procedures making the nation´s highway system cost-effective and longer-lasting. In rehabilitation techniques thickness and deflection are main elements of overlay design. There are a lot of researches on the asphalt concrete pavement overlay at home and abroad, but few people concerns about the reliability analysis of asphalt overlay based on finite element. In this paper, typical asphalt pavement overlay structure reliability analysis base on Monte Carlo´s Latin hypercube sampling method was performed through which the paper pertinently offered decision basis for improve the reliability of overlay structure and important reference values for drafting and selecting of asphalt pavement overlay design parameters sensitivity analysis of the design parameters is made, at last providing theoretical and design basis for Overlay structure.