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F. Mitlmeier¹, F. Kotter¹, C. Moormann¹, N. Lillin² and S. Freudenstein²

¹Institute of Geotechnical Engineering, University of Stuttgart, Germany
²Chair and Institute of Road, Railway and Airfield Construction, Technical University of Munich, Germany

doi:10.4203/ccc.1.3.4

F. Mitlmeier, F. Kotter, C. Moormann, N. Lillin, S. Freudenstein, "Numerical study on the appearance of mud spots due to clay-fouled ballast", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 3.4, 2022, doi:10.4203/ccc.1.3.4

Keywords: mud spot, dynamic finite element method, clay-fouled ballast, hypoplasticity.

Abstract

In the case of ballasted tracks and cohesive water-saturated subsoils mud spots may occur due to cyclic and dynamic loading by railway traffic. By means of mechanically-hydraulically-coupled dynamic 2D-FEM simulations in this paper evolving mud spots due to clay fouling are investigated. Dynamic loading is considered by model of Fryba, the mechanical behaviour of ballast and clay is represented by hypoplastic constitutive models. According to an ascending ballast contamination it can be shown that vertical deflection of the track is continuously increasing and different zones of suction and of excessive pore pressure in the subsoil are developing.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 1 PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 3.4 Numerical study on the appearance of mud spots due to clay-fouled ballast F. Mitlmeier¹, F. Kotter¹, C. Moormann¹, N. Lillin² and S. Freudenstein² ¹Institute of Geotechnical Engineering, University of Stuttgart, Germany ²Chair and Institute of Road, Railway and Airfield Construction, Technical University of Munich, Germany doi:10.4203/ccc.1.3.4 Full Bibliographic Reference for this paper F. Mitlmeier, F. Kotter, C. Moormann, N. Lillin, S. Freudenstein, "Numerical study on the appearance of mud spots due to clay-fouled ballast", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 3.4, 2022, doi:10.4203/ccc.1.3.4 Keywords: mud spot, dynamic finite element method, clay-fouled ballast, hypoplasticity. Abstract In the case of ballasted tracks and cohesive water-saturated subsoils mud spots may occur due to cyclic and dynamic loading by railway traffic. By means of mechanically-hydraulically-coupled dynamic 2D-FEM simulations in this paper evolving mud spots due to clay fouling are investigated. Dynamic loading is considered by model of Fryba, the mechanical behaviour of ballast and clay is represented by hypoplastic constitutive models. According to an ascending ballast contamination it can be shown that vertical deflection of the track is continuously increasing and different zones of suction and of excessive pore pressure in the subsoil are developing. download the full-text of this paper (PDF, 2982 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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