Research On The Asphalt Pavement Rutting Prevention Technology Based On The Pipe Network Cooling System

With the continuous construction of expressways and urban roads in China,more and more asphalt pavements need to face the problem of rutting disease caused by continuous high temperature in summer.Therefore,the research on the asphalt pavement rutting prevention technology based on the buried pipe network cooling system has the engineering application significance of preventing the rut disease and slowing down the urban heat island effect.However,few domestic and foreign scholars have studied the rutting prevention technology using the buried pipe cooling system to cool the asphalt pavement.Therefore,using the methods of literature review,numerical simulation,theoretical analysis and parameter analysis,the asphalt pavement rutting prevention technology based on buried pipe network cooling system is studied in the manuscript,and draws the main conclusions are drawn as follows:(1)Based on the heat transfer process analysis of the pavement structure and the external environment,by using the COMSOL finite element analysis software,the transient three-dimensional temperature field model of the asphalt pavement with buried pipe network cooling system is established in the thesis,the surface temperature results of the asphalt pavement with buried pipe network cooling system are obtained,and the difference of temperature field of the asphalt pavement between the no buried pipe network cooling system and buried pipe network cooling system.and the influence of the buried depth of the pipe network,the spacing of the buried pipe,the water flow velocity in the pipe network and the different external environment on the cooling effect of the asphalt pavement is analyzed.(2)In order to give consideration to the cooling effect of asphalt pavement and the stability of pipe network cooling system,the smaller spacing of buried pipe and larger buried depth of pipe network should be selected,and the design range of buried depth of pipe network should be 10 cm ~15cm,the design range of buried pipe spacing should be 5cm ~10cm,and the design range of water flow velocity in the pipe network should be 30L/min~60L/min.(3)Based on a certain section of asphalt pavement vibration compaction data and its wavelet analysis results,the working parameters of the vibration roller in the process of numerical simulation are selected,and the load of the vibratory roller is simplified as a sine wave load.The finite element analysis software of ABAQUS is used to establish the dynamic finite element model of the asphalt pavement structure under the action of the moving load.The overall displacement and stress results of the model are analyzed,and the effect of buried pipe depth and buried pipe spacing on the maximum tensile stress of buried pipe network is analyzed.