Study On The Asphalt Pavement Typical Structure Of Urban Road In Urumqi City

Our country with vast territory, has significant difference in area climate, geology, soil, hydrological conditions and pavement material. There are a lot of work to do with standardize the guidance on the local traffic conditions, material sources and natural environmental conditions of the pavement structure design in the actual engineering design. The final design of the pavement structure tend to conservative and without economy, or in order to save construction cost make to the pavement structure is not safe, produce early damage disease, the reasons to this problem include weather conditions, material sources, the experience of the designer, project investment limit and design information failure reason in the design process, these problems especially in the city road pavement structure design. With city road construction rapid development in Urumqi today, how to follow the guidance of our country pavement design specification, and accord to Urumqi’s climate, soil and geological conditions and material sources and so on, reasonable design of pavement structure,to make pavement structure design standardization, charts, avoid the pavement structure design is uneconomic or not security, what appears very urgent and important.In this paper, a comprehensive investigation for asphalt pavements of Urumqi city has been made, and classifies different structures into semi-rigid base asphalt pavement, flexible base asphalt pavement and composite base asphalt pavement as paving asphalt stabilized course over semi-rigid base. Choose typical sections of every structure in different function areas of the city as the respondents. Mainly include:(1)the peak hour traffic investigation clears the composition of the vehicle load in different regions forecasts the cumulative equivalent axle loads in design period and grades into different levels;(2) the bearing plate test in actual project and theoretical analysis make sure the lower limit of the strength of the foundation and graded into different levels too;(3) the deflection test analyzes the bearing capacity of different structures after traffic opening;(4) sampling on the road evaluates the mechanical properties and composition of the material.Secondly, research base and asphalt mixture material through indoor and outdoor experiments, determine the design parameters, and then recommend reasonable typical structure.Finally we calculated the layers thickNess of pavement structure based on the traffic, foundation strength, design parameters. The structures must pass the estimate of the mechanics-experience pavement design guide, then they are recommended as the typical structures of the Urumqi city asphalt pavement.