The Rebuilding Plan Selection And Pavement Splicing Research In Guang-qing Expressway

With the rapid economic development,most of the early construction of some expressway in our country because of the low design standard to choose and cannot use a forward-looking view of the problem such as the growth of traffic volume,making the service quality and capacity gradually cannot meet the requirements of the current rapid economic development,so it is imminent to reconstruct some frequent traffic congestion of road.Because of the reconstruction project conducted on the basis of the original road,the reconstruction under various constraints to design and construct.Therefore,expressway reconstructions have many issues which are worthy of exploration and research.The vacancy of extension and reconstruction need a lot of practice and theories to fill.So the research of reconsruction for the expressway is significance to the long-term development of transport undertakings in our country.Based on the premise of Guang-qing high-speed reconstructed in the paper.Firstly,analyzing and comparing the dilatancy mode and the extension mode,thus getting the conclusion that the extension mode is more suitable.Then focused on the four kinds of domestic common expansion plan:unilateral splicing,on both sides of the mosaic,unilateral separation and on both sides of the separation.Analyzing the respective characteristics,and based on Guang-qing high-speed actual situation,applying fuzzy comprehensive evaluation method that analyze the cost of the project,the difficulty to implementation,making use of the land and sustainability of the project and so on seven standard in total to get the optimal choice of extension program.Confirmed with the actual situation,providing a theoretical basis for the choice of Guang-qing high-speed reconstruction project.By using the finite element analysis to research the expressway situation of splice,comparing the shear stress and the vertical deformation on the top of surface layer in different roadbed splicing widens,we can get the reasonable splice width in each structural layer.Morever,combining the transverse distribution of the road wheel track and the low of the most unfavorable load effect,the essay made a recommendation for the splice design on the Guang-qing newly or old roadbed.Finally,this paper declared the specific procedure of subgrade treatment and introduced some of the adoptable measures when to carry out.The result in this paper can provide a certain reference in the same type of expressway treatment project studies,the part of the analysis results can also be applied in different grades of reconstruction project.