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| Research on dynamic response of railway subgrade filling material under vibration compaction based on VMD-Hilbert transform |
| YANG Changwei1，ZHANG Liang1，SU Ke1，DONG Longjun2，CAI Degou3，YE Yangsheng3，TONG Xinhao1，MA Hongsheng4 |
| (1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410012，China；3. State Key Laboratory for High-speed Railway Track Technology，China Academy of Railway Sciences Corporation，Beijing 100081，China；4. Sichuan Highway Planning，Survey，Design And Research Institute Ltd.，Chengdu，Sichuan 610041，China) |
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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.
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2022, Vol. 41 
