Publicacións

@article{castanheira-pinto_predicting_2023,

title = {Predicting the non-linear critical speed for high-speed railways in singular geotechnical scenarios},

author = {Alexandre Castanheira-Pinto and Jesús Fernández-Ruíz and Pedro Alves-Costa},

url = {https://www.sciencedirect.com/science/article/pii/S026772612200567X},

doi = {10.1016/j.soildyn.2022.107722},

issn = {0267-7261},

year  = {2023},

date = {2023-02-01},

urldate = {2023-02-01},

journal = {Soil Dynamics and Earthquake Engineering},

volume = {165},

pages = {107722},

abstract = {Studying and predicting the non-linear critical speed in high-speed railway lines is very costly in terms of computational efficiency. To overcome such particularity, the authors have proposed a simplified methodology based on dispersion curves combined with degraded ground properties, which is capable of predicting the non-linear critical speed with a low computational cost and a very acceptable accuracy. However, the application of this methodology is limited to normally dispersive geotechnical profiles. In this paper, the authors present and experimentally validate a novel methodology, similar to the one already published, which can be applied to any geotechnical scenarios.},

keywords = {Dispersion curve, Non-linear critical speed, Non-linear soil behavior, Railway dynamics, Semi-analytical methodology},

pubstate = {published},

tppubtype = {article}

}

@article{castanheira-pinto_simplified_2022b,

title = {A simplified approach for predicting the non-linear critical speed of railway tracks},

author = {Alexandre Castanheira-Pinto and Jesús Fernández-Ruíz and Aires Colaço and Pedro Alves Costa and David P. Connolly},

url = {https://www.sciencedirect.com/science/article/pii/S2214391222001490},

doi = {10.1016/j.trgeo.2022.100865},

issn = {2214-3912},

year  = {2022},

date = {2022-11-01},

urldate = {2026-08-10},

journal = {Transportation Geotechnics},

volume = {37},

pages = {100865},

abstract = {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.},

keywords = {Non-dimensional dynamic amplification functions, Non-linear critical speed, Railroad geodynamics, Railway dispersion curve technique, Railway track dynamics, Simplified railway dynamics methodology},

pubstate = {published},

tppubtype = {article}

}