Semianalytical Solution for Dynamic Responses of Railway Track System on Unsaturated Poroelastic Half-Space Subjected to Moving Trainload
Publication: International Journal of Geomechanics
Volume 21, Issue 3
Abstract
A track-unsaturated ground model was proposed to study the dynamic responses of the unsaturated subgrade induced by moving trainloads. The subgrade was modeled by an unsaturated poroelastic half-space, and the railway track system comprises a rail, sleepers, and ballast. The double Fourier transform was applied to solve the governing equations of the entire system in the frequency domain. The semianalytical results in the time domain were further obtained using the fast inverse Fourier transform. The effects of saturation, train speeds, and intrinsic permeability of soil on the dynamic responses were studied in both the time and frequency domain. It was found that the effects of saturation and train speed on the responses of displacement, acceleration, and pore-water pressure are significant. For low saturation, the vertical displacement response of unsaturated half-space is similar to that of the elastic half-space, and the intrinsic permeability has little effect. While for high saturation, the amplitude of vertical displacement increases with the increase of intrinsic permeability of the soil.
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Acknowledgments
This work was supported by the Outstanding Youth Foundation of Hubei Province (2017CFA056) and the National Natural Science Foundation of China (41672312 and 41972294).
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Published In
International Journal of Geomechanics
Volume 21 • Issue 3 • March 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 8, 2020
Accepted: Oct 23, 2020
Published online: Jan 15, 2021
Published in print: Mar 1, 2021
Discussion open until: Jun 15, 2021
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