Long Steep Asphalt Concrete Pavement Structure Under Heavy Load Analysis

As a kind of typical viscoelastic materials, the temperature sensitivity of asphaltmaterials is high.It easily leads to pavement rutting destruction happenings, especiallyfor the roads with the longitudinal slopes, heavy traffic and overloaded vehicles in thetorrid areas. At present, the vehicles overload is serious, makes some expresswayopened to traffic operation soon appeared all sorts of disease, greatly reduce the drivingcomfort and safety of the road. Current specification has not yet been will grow up tograde road asphalt concrete pavement structure layer individually designed, and twofactors will be overloaded and long steep slope on the synergy less analysis of theresults.This article depends on project of gansu province bureau (gan band (research)032012] grew up in the loess area highway longitudinal slope sections of key technologyresearch of asphalt pavement and chongqing jiaotong university graduate studentinnovation fund project (project number:20120111) under the action of the overloadlong steep road asphalt concrete pavement structure analysis, combined with the newhighway in gansu province long steep road pavement structure, on the force analysis,the main research content is as follows:First survey of chongqing Shi Zhong highway long steep slope sections of pavementdisease field investigation, and statistical analysis of pavement disease types anddistribution characteristics. According to the type and the mechanism of disease, makesure to tensile stress and shear stress of pavement structure layer as the main mechanicsindex of theoretical analysis. Against diseases along the vertical depth and horizontaldirection of distribution, long steep slope sections under the action of the overloadingasphalt concrete pavement structure for detailed analysis.BISAR analysis of structure parameters, establishes the coordinate system andcalculated under the normal use of state road table place stress and strain, and itsdistribution, summed up the biggest stress and strain point coordinates. Calculationwhen the longitudinal grade is3%, under the standard load and overload at all levels,pavement structure layer, the rules of stress and strain with depth is summarized alongthe depth direction, the maximum stress and strain of the point.Max point coordinates in the plane on the basis of, through a large number of analysisand calculation, each of the asphalt pavement structure layer beneath the top layer,middle layer, the depth, as well as the top layer and the surface, beneath the surface andthe interlayer, in between the layers below the bottom of the long steep slope andoverloading under the influence of stress and strain change rule.