基于高速铁路路基冻胀的轮轨动力响应研究

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Abstract Frost heave of high-speed railway ballastless track subgrade in seasonal frost areas affects the safety and comfort of train operation and service performance of ballastless track’s main structure. In order to study dynamic response of wheel-rail under the combination effect of subgrade frost heave and high-speed driving load, the vehicle-track-subgrade frost heave coupled dynamic model was established to analyze the wheel-rail dynamic response of CRTSI type slab ballastless track and track structure’s stress state under different frost heave peak values, frost heave positions and train speeds. The results showed that dynamic response of wheel-rail increases in frost heave regions, the safety and comfort of train operation at speed of 350km/h meet the standard requirements of frost heave management, but wheel-rail force increases with increase in frost heave peak values and operation speed; vibration of track slab and base plate intensifies; within calculated range of frost heave wavelength and amplitude, peak value of vibration acceleration of track slab at gaps exceeds dynamic acceptance standard requirements, and it is easy to cause damage and failure of CA mortar layer and subgrade bed surface at gaps, vibration accelerations of track slab and base plate increase with increase in driving speed, dynamic stress of track structure is closely related to train load transmission; train load under state of subgrade frost heave causes track slab and base plate to be in tension and compression alternating state, and proposing measures in design is needed to control cracks; train speed has less effects on track structure stress during shortwave subgrade frost heave.

Key words： subgrade frost heave dynamic response high speed railway ballastless track

Received: 03 April 2019 Published: 28 December 2019

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	ZHANG Lushun1
	ZHAO Guotang1
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Cite this article:

ZHANG Lushun1,ZHAO Guotang1,2. Dynamic response of wheel-rail based on frost heave of high-speed railway subgrade[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(1): 8-14.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I1/8

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