Dynamic Responses Law of Subgrade of a Special Railway Line in Loess Region

doi:10.16183/j.cnki.jsjtu.2021.130

Abstract

Abstract:

In order to investigate the dynamic response law of subgrade of a special railway line in loess region under moving train loading, the field test data and 2.5D finite element results were adopted to assess the dynamic stress distribution and its influence depth, and the environmental vibration law in the office area along the line was also analyzed. The results show that the excessive abstraction of the track system might enlarge the amplitude and influence the range of dynamic stress. The entity modeling of the ‘ballast-sleeper-fastener’ system makes the distribution of the dynamic stress in the subgrade more reasonable. The influence of energy consumption caused by the dynamic creep of soil have a negligible influence when the subgrade is in a quasi-static state. The speed has a negligible effect on the distribution of the dynamic stress of the subgrade when a freight train is running at a low speed, and the influence depth of the dynamic stress is about 4.2 m. As the speed decreases, the influence of track irregularity on the environmental vibration increases. The environmental vibration can be effectively controlled by improving the short wave length irregularity.

Key words: traffic loading, field test, 2.5D finite element method, influence depth, environmental vibration, irregularity

CLC Number:

U213

WANG Rui, HU Zhiping, YIN Ke, MA Jiakuan, REN Xiang. Dynamic Responses Law of Subgrade of a Special Railway Line in Loess Region[J]. Journal of Shanghai Jiao Tong University, 2022, 56(7): 908-918.

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土层	厚度/ m	密度/ (kg·m^-3)	模量/ MPa	阻尼比	泊松比
基床表层(新建)	0.7	1900	86.5	0.04	0.25
基床底层(新建)	2.3	1850	75.0	0.04	0.25
路堤本体(新建)	1.75	1750	50.0	0.04	0.25
场地填方体	7.0	1750	50.0	0.04	0.25
基床表层(既有)	0.7	1900	86.5	0.04	0.25
基床底层(既有)	2.3	1850	75.0	0.04	0.25
路堤本体(既有)	4.7	1750	50.0	0.04	0.25
地基土层	10	1680	26.3	0.05	0.25
基岩	10.0	2000	126.0	0.02	0.32