Vibration levels of ground around railways in seasonally frozen regions
In seasonal frozen regions,the temperature cold weather in winter makes the shear wave velocity of soil change drastically,where the characteristic of the ground vibration induced by trains is yet to be revealed.A negative temperature-related dynamic modulus into a train-track-ground coupling vibration model to simulate ground vibration level under the conditions of different temperatures,different distances,and different vehicle speeds is introducted.The results show that:when the temperature has not dropped to the threshold temperature of-8.7℃in the winter,the ground vibration is not affected by the negative temperature;as the temperature continues to drop,the mid-and high-frequency components of ground vibration are significantly suppressed,but the low-frequency components are not affected much by negative temperature;for the med-and high-frequency components,the lower the temperature,the greater the attenuation with the distance from the track;the increase of the vehicle speed will aggravate the ground vibration,which is basically not affected by the temperature.The results of this paper can be helpful to deeply understand the propagation characteristic of train-induced vibration in seasonal frozen ground,and provide a useful reference for the development of vibration reduction technology.
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