列车荷载下桩-土复合地基动力响应研究进展

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Abstract Research purposes: Under the train load, pile-soil composite foundation will produce dynamic action, and even cause strength failure or overall deformation and destruction, which seriously threaten the safety of train operation. Therefore, it is urgent to study the dynamic characteristics of pile-soil composite foundation under train load, which is of great significance to effectively improve the stability of railway subgrade and ensure the safety of high-speed train. This paper analyzes the reinforcement mechanism and failure mode of pile-soil composite foundation, summarizes the research status of domestic and foreign scholars on the dynamic response of pile-soil composite foundation under different dynamic loads and the dynamic response law of several commonly used different pile type composite foundation under train loads. On this basis, it points out the shortcomings of current research and puts forward the research problems that need to be paid more attention in the future.
Research conclusions: (1) Although the dynamic response of pile-soil composite foundation under different dynamic loads presents different characteristics, the response of pile body is greater than that of soil body under dynamic loads, which is consistent with the action mechanism of pile-soil composite foundation, whether under static or dynamic loads, piles bear most of the load. Therefore, the research on the dynamic response of pile-soil composite foundation should focus on the response of piles, but the influence of soil between piles should not be ignored. (2) Pile materials, shape of pile, pile cap, thickness of mattress layer, modulus of composite soil and other factors will influence the dynamic characteristics of pile-soil composite foundation, and the dynamic response characteristics of pile-soil composite foundation under train load are also related to the speed of the train, train load, cycle times and so on. It is generally believed that the rigid pile composite foundation has good seismic performance, and gravel or gravel mats exhibit good isolation. (3) The soil vibration response of pile-soil composite foundation composed of different pile types under train loads attenuates along the depth direction, but the pile body amplifies in a certain part. Therefore, the dynamic characteristics of pile should be considered when designing composite foundation of different pile types. (4) The research conclusion can provide a theoretical basis for the optimal design of railway pile-soil composite foundation.

Key words： pile-soil composite foundation reinforcement mechanism dynamic loads dynamic response

Received: 31 May 2021

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TU443

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	WU Honggang
	GUAN Wei

Cite this article:

WU Honggang,GUAN Wei. Research on the Progress of Dynamic Response of Pile-soil Composite Foundation under Train Load[J]. Journal of Railway Engineering Society, 2022, 39(7): 1-11.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I7/1

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