Analysis And Numerical Simulation Of Ground Vibration Caused By Underground Rail Transit

With the rapid development of China ’ s transportation construction,the three-dimensional transportation system based on highway,railway and air transport is taking shape,among which the intersection and interference between different construction projects are unavoidable.Soil vibration caused by rail transit is an important research direction.In recent years,more and more attention has been paid to the influence of rail transit vibration,such as precision electronic factory,University laboratory,airport air traffic control and so on.Based on the research background of Zhengzhou-Airport Intercity Railway,the monitoring and simulation data are analyzed,and the surface characteristics of rail transit vibration are summarized.The main contents of this paper are as follows:Based on the geological survey data,engineering design data and field data,the vibration response is introduced and analyzed.(1)Through reading the literature,we can understand the mechanism of rail transit vibration,the mathematical expression of vertical load,the basic detection methods and analysis methods of vibration.(2)Through the field test of the impact of the Zhengzhou-Airport Intercity Railway on the airport,the time history of the ground vibration velocity near the track in the detection area is obtained.After that,the field measured data collected from each test point are processed.Then the frequency spectrum analysis of the processed signal and the curve analysis of the speed level varying with distance at different frequencies are carried out,and the vibration response of the ground measurement points around the detection area caused by rail transit vibration and the relevant propagation law are obtained.(3)According to the soil parameters in the geological prospecting report of the detection area,the quantitative expression of vertical vibration load based on train parameters,train speed,ABAQUS is used to simulate the three-dimensional numerical model,and the simulation results are analyzed.Then,by comparing the monitoring data and three-dimensional simulation results,the vibration response characteristics of rail transit are analyzed,which can be used as a reference for similar projects in the future.