Experimental And Analytical On Source Characteristic Of Vibration In No.9 Turnout Area Of Metro

With the rapid development of China's economy,the urbanization process is accelerating,and the urban traffic pressure is gradually increasing,leading to a contradiction between the growing public transportation demand and the limited ground transportation resources,which brings huge challenges to the urban public transportation system.The challenge has limited the development of urban development to a certain extent.Building a subway system is an extremely important measure to alleviate the shortage of urban public transportation.However,the construction of an intensive network of underground railway will lead to an increase in the vibration of the ground environment,and the secondary noise of the building structure caused by vibration is also increasingly obvious,and for the convenience of transportation,there will usually be dense residential areas near the station.The subway track is placed near the station,and the impact between the wheel and the track will occur when the train passes through the winding area,resulting in increased environmental vibration.Therefore,while the subway relieves the pressure of rail transit,it also produces a certain degree of ground environmental vibration pollution.In order to reduce or even solve this negative effect,it is necessary to conduct research and analysis on the vibration source strength of the subway.The purpose of this paper is to fully analyze the vibration source strength characteristics of the No.9 metro area in the subway,and provide a theoretical basis for the subsequent vibration control of the reclamation area.The specific research contents are as follows:(1)Through the comprehensive analysis of the research status of the vibration source strength of metros at home and abroad,the evaluation criteria of the vibration source strength of the subway are understood.The vibration distribution of the sag area is studied through field test,and the position of the vibration point of the vibration source of the sag area is determined.Provide a basis for the vibration source test program;(2)Through comprehensive analysis of the research status of internal and external integrated subway vibration source strength,the evaluation criteria of subway vibration source strength are recognized,and the vibration distribution of the sag area is studied through field test,and the position of the vibration point of the turbulent area is determined.Based on the vibration distribution of the reclamation area,two sets of ballasts with good orbital state are selected for the A and B vehicles,and the spectrum distribution characteristics of the vibration source intensity in the reclamation area are analyzed.And the value range,the reference value of the vibration source strength in the reclamation area is given,which is provided for the EIA work,and provides the verification basis for the subsequent establishment of the theoretical model.(3)Finally,based on the rigid-flexible coupling theory and the finite element theory,the rigid-flexible coupling model and the bifurcation-suction finite element model of the turnout are established.On the basis of the theoretical model,the influence of the speed of the turnout and the irregularity of the rail surface on the vibration source strength in the bifurcation area is studied.