高速铁路无砟轨道路基动应力概率分布特征及估算方法

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Abstract Clarifying the dynamic response of the subgrade caused by the high-speed train is the key to the design of the subgrade structure. Applying the vertical coupling dynamic model of high-speed EMU train, CRTS III ballastless track, and soil subgrade, with the random irregularity generated by the high-speed railway ballastless track spectrum as the excitation, to analyze the subgrade surface dynamic stress characteristics and its statistical laws with respect to driving speed v and track spectrum cumulative probability λ, and to discuss the relations between dynamic stress coefficient ϕ's probability distribution parameters(position parameter μ and scale parameter β) and v, λ. Then a probability estimation model of ϕ is to be erected by dimensionless technology. The research shows that the train dynamic action on the subgrade surface has significant randomness, the dynamic stress coefficient ϕ obeys the Gumbel distribution, and the mode value μ and the discreteness β increase nonlinearly with v and λ. By introducing normalized indices Iμv, Iμλ, Iβv, and Iβλ, which are respect to probability distribution parameters μ and β of ϕ, the binary function expressions μ(v, λ) and β(v, λ) are derived. Based on the CDF of ϕ, a quantile value estimation equation ϕ(v, λ, p) with a guaranteed rate p is established. The relative bias is less than 5% compared with the calculated values of coupling dynamic simulation.

Key words： ballastless track subgrade dynamic stress probability distribution normalized index estimation equation

Received: 21 April 2022 Published: 28 June 2023

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	Articles by authors
	XIE Hongwei1
	2
	LUO Qiang1
	2
	JIANG Liangwei1
	2
	YE Qingzhi1
	2
	FENG Guishuai1
	2
	ZHAO Mingzhi3

Cite this article:

XIE Hongwei1,2,LUO Qiang1, et al. Robability distribution characteristics and an estimation method for dynamic stress of high-speed railway ballastless track subgrade[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(12): 29-38.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I12/29

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