基于VMD-Hilbert变换的铁路路基填料振动压实动力响应研究

doi:10.13722/j.cnki.jrme.2021.0415

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Abstract The coarse-grained soils used in the subgrade filling of Beijing—Xiongan intercity railway was selected to carry out surface vibration compaction test，and the dry density threshold of the coarse-grained soils under different vibration frequency and excitation force combination was studied. Then，the nonlinear dynamic response between vibration equipment and filling material is studied by using VMD Hilbert transform. The energy transformation of compaction process is analyzed based on the law of energy conservation. And the compaction degree of the filling material is evaluated by the Hilbert marginal spectral energy of acceleration signal. The results show that：the dry density of the filling material in the surface vibration compaction test presents a trend of “rapid growth，slow growth，keep stable”，and the dry density threshold of filling material is different under different compaction parameters. By using the VMD to decompose the acceleration signal，the fundamental and harmonic components can be accurately identified and separated，and there is no mode aliasing. By analyzing the Hilbert spectrum and Hilbert marginal spectrum of acceleration signal，the propagation law of acceleration signal energy in time-frequency domain during compaction process is obtained，which shows the transfer from low-frequency fundamental component to high-frequency harmonic component. In addition，there is a logarithmic relationship between the Hilbert marginal spectral energy of the exciter acceleration signal and the dry density of the filling material， so it is feasible to use the Hilbert marginal spectral energy of the vibration signal decomposed by VMD to evaluate the compaction degree of the filling material.

Key words： subgrade engineering vibration compaction dynamic response variational mode decomposition Hilbert transform compaction degree evaluation

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	Articles by authors
	YANG Changwei1
	ZHANG Liang1
	SU Ke1
	DONG Longjun2
	CAI Degou3
	YE Yangsheng3
	TONG Xinhao1
	MA Hongsheng4

Cite this article:

YANG Changwei1,ZHANG Liang1,SU Ke1, et al. Research on dynamic response of railway subgrade filling material under vibration compaction based on VMD-Hilbert transform[J]. , 2022, 41(S1): 2991-3001.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0415 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2991

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