Investigation And Optimization Of Traffic Noise On Elevated Composite Road

With the progress of society and the development of economy,the urban population is increasing,and the traffic jam is becoming more and more serious.In first-tier cities where land is scarce and every bit of land is precious,in order to make reasonable and efficient use of land and relieve the pressure of surface transportation,urban transportation has begun to develop in a three-dimensional and diversified way,thus forming underground transportation dominated by rail transportation,surface transportation dominated by road and overground transportation dominated by elevated roads,which together form a three-dimensional transportation network.Indeed,the appearance of three-dimensional traffic alleviates traffic congestion to a certain extent,but it also produces three-dimensional traffic noise,especially the elevated composite road formed by urban arterial road and elevated road on the ground.Due to the large flow,fast speed,high position and wide range of elevated composite road,more serious noise pollution is produced.As an important means to prevent and control traffic noise on elevated roads,it is a very worthwhile topic to study the current situation of traffic noise on elevated composite roads after the installation of acoustic barriers and whether there are some problems.In order to understand the specific situation of traffic noise on elevated composite roads in Hefei City,this paper carried out research by literature research,field investigation,data analysis and simulation verification.Through the systematic investigation,it is found that the distribution characteristics of the elevated composite roads in Hefei are concentrated in urban areas and dispersed in suburban areas.Traffic characteristics for urban traffic flow is large,suburban traffic flow is small;The characteristics of acoustic functional areas are that the acoustic functional areas near the eastern and northern viaducts are more complex,while the acoustic functional areas near the southern and western viaducts are simpler.The sound barrier is characterized by consistent structure and uniform type,but there are problems such as discontinuous installation,gaps at the top,holes in the screen body,connection problems,substandard length,unsealed foundation and "decorative" sound barrier.The measured analysis shows that the size distribution of traffic noise of elevated composite road is different from the traditional cognition,that is,it is a fallacy that the sound pressure level of uphill and downhill road is larger than that of straight road.In fact,regardless of the silent barrier of uphill and downhill road,its sound pressure level is always smaller than that of straight road.The vertical distribution characteristics of the traffic noise of the elevated straight sound barrier section are as follows: first,then,then,then,the traffic noise begins to decrease after reaching the peak value.The vertical distribution law of the traffic noise of the on-ramp up-slope sound barrier section and the off-ramp down-slope silent barrier section is: the traffic noise continues to increase with the increase of height,and then begins to decline after reaching the peak value.Aiming at the current situation and existing problems of noise in Hefei city,this paper puts forward noise control strategies from five aspects: road planning,building layout,structural components,sound insulation barrier and vegetation greening,and uses Candna/A,a professional noise simulation software,to simulate and verify the effectiveness of the strategies.In general,this paper intends to summarize the characteristics and existing problems of the elevated composite roads in Hefei city through systematic investigation and actual measurement analysis,so as to propose optimization strategies for the prevention and control of traffic noise of the elevated composite roads,hoping to provide reference for the subsequent prevention and control of traffic noise of elevated composite roads.To provide suggestions for the control and management of urban environmental protection departments,and to create a harmonious and peaceful living environment for urban residents.Figure 87 table 31 reference 70...