The Study On The Environmental Vibration Response And Propagation Characteristics Of Baolan High-speed Railway Embankment Area

With the rapid development of high-speed railway,the environmental vibration problems caused by the operation of high-speed railway not only disturb the life of residents along the route,but also cause fatigue damage to the structure.Baolan high-speed railway is an important high-speed railway connecting the east and west of China,so that the northwest part of China is fully integrated into the layout of the "four vertical and four horizontal" high-speed railway network.Baolan high-speed railway is one of the most typical of high speed railway in loess areas of China,so the treasure environmental vibration problems of high speed railway of Baolan for high speed railway high-speed railway environmental vibration research has the vital significance.In this paper,the dynamic response and propagation characteristics of high-speed railway environment vibration are studied by the field test experiment and numerical simulation method.The main research conclusions are as follows:(1)Through the measurement of the environmental vibration on one side of the embankment of the Baolan passenger dedicated line at about DK933+110,it is found that the environmental vibration intensity attenuates with the distance from the distance from the center line of the distance line,and the vibration intensity is mainly divided into three stages.The vibration intensity of the high-speed train is related to the driving speed and the axle weight of the vehicle.(2)The analysis of the field measured results of environmental vibration on Baolan passenger dedicated line shows that the vibration frequency distribution of the high-speed train is basically the same,that the near track center line is mainly high frequency,and the distance from the center line of the track is mainly low frequency.(3)The results of the environmental vibration response analysis of the numerical simulation show that the acceleration attenuation law is basically the same as that in the field test;the height of the embankment has a certain mitigation effect on the environmental vibration;the greater the speed of the train running,the greater the vibration intensity of the environmental vibration;the greater the soil moisture content of the soil,the greater the intensity of the environmental vibration,and the vibration intensity of the environment after the increase of water content to 15%.The influence is not big.(4)The vibration intensity of the environmental vibration intensity of the embankment section of the high speed railway will appear in the process of attenuation with the distance,the field test vibration rebound appears at 36 m,the numerical simulation appears at about 15 m,both have the vibration rebound,but the rebound position is different.The vibration rebound phenomenon is analyzed by numerical simulation.The results show that the higher the embankment height is,the farther the vibration rebound is,and the speed of the high-speed train is not greatly affected by the speed of the high-speed train.