Study On The Reasonable Thickness Of Asphalt Pavement For Heavy-traffic High Grade Highway

With the rapid development of national economy, highway transportation present a series of characters: heavy load, large flow and channelized traffic.Due to the substantial increasing traffic volume, heavy-duty truck and heavy-load vehicles, pavement appears severely damage, thickness design in pavement structure of heavy traffic using standard axle load and graphical representation difficult to satisfy the modern traffic. Based on load character of heavy traffic vehicles, the study on reasonable thickness of asphalt pavement of high-grade highways have significant theoretical and practical value.Using the method of combining theory with practice, This study analyzed the damage forms of the existing asphalt pavements and the vehicles running characteristics in Tangshan, put forward the load diagram of heavy traffic asphalt pavement and analyzed mechanical characteristic with Bisar3.0 and the load diagram. On this basis, by using long-life pavement design concept for reference, the study made research on design indexes, design parameters, combinations of variant structure types and design of reasonable thickness, built model of reasonable thickness design for highway traffic asphalt pavement. Finally, the study recommended reasonable thickness and material types for heavy traffic asphalt pavement.Two trial roads were built to verify the study results of laboratory reaserch, they are still in good condition after one year. The observation and life-cycle cost analysis of the trial roads showed that the pavement structure types this study recommended was reasonable, with high performance-price ratio and significant economic and social benefits.