Numerical simulation demonstrates reduced safety factors in double-track railway support systems, indicating greater vulnerability to long-term permanent deformation.
This paper presents the results of three-dimensional finite difference numerical models developed to evaluate the behaviour of the materials constituting the track support, considering single and double track configurations.The parameters of strength and deformability of the sub-ballast, subgrade, and embankment layers were varied in the models.Findings indicate that the double-track configuration is the most unfavourable for the analysed scenarios.The minimum and average safety factors obtained for the sub-ballast and subgrade layers are relatively low, implying an overstress and significant long-term deformations.The developed models were able to simulate satisfactorily the real stress distribution and clearly showed that the permanent deformation due to loading acting on the track is influenced by the stiffness of the support system.
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Diaz et al. (2024) studied this question.
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