Dynamic track-soil interaction—calculations and measurements of slab and ballast tracks
- 21 January 2021
- journal article
- research article
- Published by Zhejiang University Press in Journal of Zhejiang University-SCIENCE A
- Vol. 22 (1), 21-36
- https://doi.org/10.1631/jzus.a1900651
Abstract
The dynamic behaviour of slab and ballast tracks was investigated using measurements and calculations. Hammer impacts and train passages were analysed and measurements were made using geophones (velocity transducers) which had been time-integrated to displacements. The calculations were carried out in the frequency-wavenumber domain for multi-beam-on-continuous soil models. The characteristics of the different tracks and track elements were established in theory and by experiment. The frequency-dependent compliances (displacement transfer functions) showed clear rail-on-railpad resonances or highly damped track-soil resonances. Compared to the rail and sleeper, the track slab had much lower amplitudes. The slab track usually had the highest rail amplitudes due to soft railpads. Train passage yielded track displacements which were a superposition of the axle loads from the two neighbouring axles of a bogie and from the two bogies of two neighbouring carriages. This global behaviour was characteristic of the track slab of the slab track, whereas the rails of the slab and the ballast tracks behaved more locally with only one bogie of influence. The measurements agreed very well with the theory of continuous soil in the case of the six measured slab tracks and acceptably well for the six measured ballast tracks. The measurements allowed us to find appropriate model parameters and to check the models. For example, the Winkler model of the soil was found to be less appropriate because it reacted more locally.Keywords
This publication has 34 references indexed in Scilit:
- Fast trains and isolating tracks on inhomogeneous soilsPublished by Thomas Telford Ltd. ,2019
- Receptance of railway tracks at low frequency: Numerical and experimental approachesTransportation Geotechnics, 2016
- Static and dynamic behaviours of isolated or unisolated ballast tracks using a fast wavenumber domain methodArchive of Applied Mechanics, 2016
- Comparison of different dispersion evaluation methods and a case history with the inversion to a soil model, related admittance functions, and the prediction of train‐induced ground vibrationNear Surface Geophysics, 2015
- Dynamic Behavior of Slab Tracks on Homogeneous and Layered Soils and the Reduction of Ground Vibration by Floating Slab TracksJournal of Engineering Mechanics, 2012
- Track–ground vibrations induced by railway traffic: In-situ measurements and validation of a 2.5D FEM-BEM modelSoil Dynamics and Earthquake Engineering, 2012
- Theoretical and experimental excitation force spectra for railway-induced ground vibration: vehicle–track–soil interaction, irregularities and soil measurementsVehicle System Dynamics, 2010
- Monitoring the dynamic displacements of railway trackProceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 2007
- Dynamics of the railway track and the underlying soil: the boundary-element solution, theoretical results and their experimental verificationVehicle System Dynamics, 2005
- Wave Propagation in Layered Soils: Theoretical Solution in Wavenumber Domain and Experimental Results of Hammer and Railway Traffic ExcitationJournal of Sound and Vibration, 1994