Non-linear critical speed analysis of high-speed railways
Non-linear critical speed analysis of high-speed railways
Developing a high-speed railway network entails several geotechnical challenges, one of the major ones being related to the critical speed phenomenon when soft soils need to be crossed. In these scenarios, the ground deformations increase noticeably with the increase of train speed, far exceeding the limits of a linear elastic behaviour. Taking this fact into consideration, this research aims to study the influence of soil non-linearity on the critical speed for slab and ballasted tracks. For this purpose, a 3D FEM non-linear numerical model was used to model several geotechnical scenarios. A different behaviour was observed as a function of the railway track, the ballasted one being deeply affected by the soil non-linearity. In contrast, for the slab track a lesser influence was shown.
Alexandre Castanheira-Pinto; Jesus Fernandez-Ruiz; Pedro Alves Costa; David Connolly
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
4. Geotechnical earthquake engineering
https://doi.org/10.53243/NUMGE2023-134
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