列车荷载作用下新型预应力路基振动特性研究

doi:10.13722/j.cnki.jrme.2022.1344

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Abstract Studying the operation performance and reinforcement mechanism of prestressed subgrades under train loads can provide technical references for engineering design. In this study，a 1∶5 scale model test was performed to explore the effect of the train axle load and the prestress on the acceleration response of the subgrade，and a three-dimensional dynamic finite element model of the prestressed subgrade was then established to analyze the distribution characteristics of the acceleration field and the prestress reinforcement mechanism. The results show that：(1) Under the action of the cyclic train loading，the peak and trough of the vertical acceleration of the subgrade fluctuate in a small range，and their mean value can be used to reflect the long-term vibration degree of the subgrade. (2) At the shoulder of the subgrade，the peak vertical acceleration linearly increases with increasing the train axle load and exponentially decreases with increasing the prestress，and an empirical model is then established to describe the relationship among the peak acceleration，the train axle load and the prestress. (3) The peak vertical acceleration exhibites a highly correlation with the prestress level，and the acceleration significantly attenuates while propagating along the transverse and depth directions of the subgrade. Therefore，the zones around the lateral pressure plate is significantly affected by the prestress comparing with the inner zones of the subgrade. (4) The horizontal prestress could alleviate the vertical vibration of the subgrade，and the core zones of the subgrade can be effectively enhanced by adjusting the prestress level and increasing the subgrade slope rate. The research findings can provide references for further understanding the reinforcement mechanism of the prestressed subgrade.

Key words： subgrade engineering prestressed subgrade model test acceleration response numerical simulation reinforcement mechanism

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	Articles by authors
	DONG Junli1
	LENG Wuming1
	2
	XU Fang1
	2
	ZHANG Qishu1
	3
	LI Zhong1
	4
	RUAN Bo1
	4
	YAO Kang1

Cite this article:

DONG Junli1,LENG Wuming1,2, et al. Study on vibration characteristics of a new prestressed subgrade under train loads[J]. , 2023, 42(11): 2847-2860.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1344 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2847

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