Prediction And Control Of Environmental Vibration In Curved Section Of Metro

With the acceleration of urbanization,traffic congestion has become increasingly prominent.Compared with road traffic,subway has the advantages of large traffic volume and small land occupation,so more and more lines have been built.With the increase of metro line network,the vibration pollution caused by train operation becomes more and more serious.Many scholars at home and abroad have done a lot of research on the environmental problems caused by Metro line.However,we know little about the "disease problem" of Metro curve line.Therefore,it is necessary to study the vibration characteristics of Metro curve line.In this paper,a curve section of a domestic metro line is taken as the research object.Firstly,the vibration source,ground environment vibration,track geometry,ballast void and wave wear are tested and analyzed.Based on the field investigation,the rigid-flexible coupling model of vehicle + track and the finite element model of track + tunnel + soil are established.Then,the accuracy of the numerical model is verified by comparing the calculated results with the measured ones.Then,the vibration responses under several typical working conditions are calculated.Finally,several feasible vibration control methods are proposed based on the results of calculation and analysis.The main contents of this paper are as follows:1.The research on environmental vibration at home and abroad is summarized,and several most common vibration prediction methods are introduced.2.According to relevant standards,firstly,the vibration source strength and ground environment vibration of typical sections are tested,and their time-domain data and spectrum characteristics are analyzed.Then,the geometric shape and position of track,the void of ballast bed and the wave wear condition are measured on site,and the service condition of track structure is analyzed.3.According to the field investigation,the rigid-flexible coupling model of vehicle+track and the finite element model of track+tunnel+soil are established by using Simpack and Ansys software.The vibration response of a group of typical working conditions is calculated,and the calculation results are compared with the previous test results to verify the accuracy of the model.4.Set up several different working conditions,calculate and analyze the influence of vehicle speed,wave wear,fastener stiffness and other parameters on vibration source strength and ground environment vibration attenuation law.5.By calculating and analyzing several key parameters,the optimal vibration reduction conditions are selected,and the feasible vibration control measures are determined according to the selected results.A kind of.