Three Directional Measurements And Analysis Of The High-speed Train Induced Ground-borne Vibration On A Viaduct Of Chengdu-chongqing High-speed Railway

With the development of high-speed railway,the quality of high-speed railway is high speed and comfort.It brings great convenience,but the problem of environment vibration induced by high-speed railway is becoming more and more prominent.Based on the theory of the vibration generation and transmission,combined with in-situ test of chengdu-chongqing railway to study the vibration characteristic,explorer the law of the propagation and attenuation of three-dimensional vibration.Measuring the different distances(distances from the longitudinal center line are 7.5 m,15 m,22.5m,30 m m and 45 m)three-directional acceleration(Z,X,Y)and analyzing the law of vibration propagation and attenuation.The main conclusions of this paper are as follows:1.At the same distance from the longitudinal center line of the bridge,the acceleration maximum and effective value of transverse(Y)and longitudinal(X)vibration are greater than that vertical(Z)vibration.2.The acceleration maximum and effective value of three-dimensional vibration attenuate with the increase of distance.3.The high frequency component of the Z and X attenuates rapidly,the low frequency component attenuates slowly;low frequency and high frequency of the transverse vibration(Y)attenuate rapidly.The dominant frequency is still low frequency at far field,the dominant frequency is all around 10 Hz at far field.4.The vertical vibration level is higher than the horizontal vibration level after weighting,the unweighted horizontal vibration level is greater than the vertical vibration.5.The law of the weighted and unweighted acceleration level with distance is basically the same.