Study on vibration response of railway subgrade in seasonally frozen region induced by train-steering in winter

In order to study the characters of subgrade vibration with frozen layer induced by the rail transit in the seasonally frozen region, the field monitoring experiment was carried on the seasonal frozen soil area in Daging. The result shows that the vibration acceleration of the subgrade induced by the train has the characteristics of periodic changes, and the characteristics of decrease and gradually become lost in cyclicity with the increase of distance monitoring stations to the center line of the railway are vertical; The existence of seasonally frozen layer have amplification effect to the subgrade vertical vibration; The accelerations of the subgrade induced by the train load decrease with the increase of the distance from the measured point to the railway, and the reduction is the factest of the vertical attenuation; The vertical vibration acceleration level shows a trend of decline with the increase of distance from the center line of the orbit and the speed is smaller, the greater the decline. Because of heavy axle load, the amplitude of attenuation of the truck is lower than ordinary passenger trains.