Dynamic responses of tram track during operation period in seasonal frozen soil area
ZHANG Zhongjie1, LI Xinxi2, WU Hang1, CHEN Jiahe1, YU Haitao2*
1. Shanghai Urban Construction Design &Research Institute, Shanghai 200125, China;
2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Abstract: Attention should be paid to the dynamic response of railway track in seasonally frozen environment under moving tram loads in order to ensure the safety of tram during operation period. The black clay in Zhangjiakou was selected as the typical frozen soil sample, and the hydraulic and mechanical properties of the sample were tested under the environment of temperature variation. The long lined track of the tram was assumed as an infinite homogeneous beam resting on a Pasternak foundation, and the analytical solution for long lined tracks subjected to moving traffic loads was obtained based on the beam-elastic foundation theory. Parametric analyses were performed to investigate the influence of the freeze-thaw behaviors of soil on the dynamic response of railway subgrade. Results showed that the dynamic response of subgrade was affected by the freeze-thaw behaviors of soil, and the dynamic stiffness of foundation would decrease with the increase of temperature, and thus contributed to the amplification of dynamic responses of the track.
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2022, Vol. 4 
