The Pavement Structure Combination Research Of The Cihu River Road Reconstruction Under The Heavy Traffic

The heavy traffic is one of the main reasons for the premature destruction of the asphaltpavement and shorten its service life in our country. This paper relied on the CiHu River Roadreconstruction engineering in Maanshan, the damage reasons of the asphalt pavement underthe heavy traffic are analyzed and the traditional semi-rigid base asphalt pavement structurecombinations are tried to optimize, so that the Cihu River Road transport properties of theasphalt pavement structure combinations are optimized.First of all, based on the investigation of the old road traffic and the pavement damagecondition of the CiHu River Road, the breakage reasons of the old asphalt pavement areanalyzed. Based on the analysis of heavy traffic impact on the axle load conversion for theasphalt pavement, in combination with the function requirements of the overloading asphaltpavement structure and the shortage of the semi-rigid base asphalt pavement structure, thescheme of placing the flexible material (the graded crushed stone material or the asphaltstabilized macadam material) between the asphalt layer and the semi-rigid base as transitionlayers are designed, and then formulated the Cihu River Road transport properties of the fourasphalt pavement structure combinations firstly.Secondly, applied the heavy traffic asphalt pavement structure design method, checkedthe thickness of the four asphalt pavement structure combinations for initial proposed, so as tomeet the requirements of the design control index. Sensitivity analysis is performed on thematerial parameters of the four asphalt pavement structures under the heavy traffic and thenformulated the thickness and the material parameters of the four asphalt pavement structures.Thirdly, made use of the finite element software ABAQUS to calculate and analysis theroad surface’s deflection, the stress variation of the four asphalt pavement structures under theheavy traffic, carried on the economic analysis simultaneously and choosed the better CiHuRiver Road transportation characteristic of the asphalt pavement structure combination by thefuzzy comprehensive evaluation method.Finally, the material unitized design of the selected transition layer in the asphaltpavement structure is optimized. Three different gradation types of the mixture ratio designare choosed, in the combination with the performance experiment (high temperature stabilitytest, low temperature stability test and water stability test) of base’s mixture materials arecompared, the more suitable mixture ratio of the transition layer materials are selected ultimately.Through the practical application of the CiHu River Road reconstruction engineering, thelong-term observation, survey and analysis will be conducted in future. Thus it will provide areference of the typical asphalt pavement structure which is suitable for heavy traffic infuture.