期刊
TRANSPORTATION GEOTECHNICS
卷 37, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.trgeo.2022.100865
关键词
Simplified railway dynamics methodology; Non-linear critical speed; Railway dispersion curve technique; Non -dimensional dynamic amplification; functions; Railway track dynamics; Railroad geodynamics
资金
- FCT/MCTES (PIDDAC) [UIDB/04708/2020, UIDP/04708/2020, UIDB/04029/2020]
- European Union [101012456]
- FEDER [PTDC/ECI-EGC/29577/2017, POCI-01-0145-FEDER-029577, PTDC/ECI-EGC/3352/2021]
- FCT/MCTES [PD/BD/143004/2018]
This research presents a simplified methodology to calculate the non-linear critical speed of track-ground structures. It uses a novel semi-analytical approach and static simulation results to predict the non-linear critical speed, providing a reliable tool.
When trains approach the railway track-ground critical speed ground deformations are amplified, potentially exceeding the linear-elastic strain range in the supporting earthworks. This leads to non-linear soil behavior which can be difficult to model due to high computational cost and the need for detailed characterization of soil properties. As a solution, for the first time this research presents a simplified methodology to calculate the non-linear critical speed of track-ground structures. The methodology uses a novel semi-analytical approach that combines dispersion curves with a simplified linear equivalent model. Using the approach, a track-ground static strain field is first calculated, and then converted into a dynamic one using a non-dimensional dynamic amplification function, independent of the elastic properties of the soil. The result allows the non-linear critical speed to be calculated using static simulation results which are relatively straightforward to generate. The methodology is validated using a 3D non-linear Hardening Soil-small (HSSmall) numerical model and then a parametric study is used to compare results for both concrete slab and ballasted tracks. The results show the proposed approach is a reliable tool for predicting the non-linear critical speed.
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