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O. Jenck¹, F. Emeriault¹, M. Dangeard², O.A. Yaba², A. Dhemaied², J.-M. Cornet² and A. Schwager-Guillemenet²

¹3SR Laboratory, CNRS, Grenoble INP, Université Grenoble Alpes, Grenoble, France
²Direction Générale Industrielle et Ingénierie - DTR-GC VA - PGRN, SNCF Réseau, La Plaine Saint-Denis, France

doi:10.4203/ccc.7.18.2

O. Jenck, F. Emeriault, M. Dangeard, O.A. Yaba, A. Dhemaied, J.-M. Cornet, A. Schwager-Guillemenet, "Assessment of the Bearing Capacity of a Subballast Layer Using a Numerical Model in a Railway Context", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 18.2, 2024, doi:10.4203/ccc.7.18.2

Keywords: trackbed mechanical performance, bearing capacity, plate load test, numerical modelling, subballast performance, Ev2 modulus.

Abstract

Trackbed mechanical quality, and more precisely bearing capacity, is one of the key parameters to plan renewal projects. It depends on the subballast’s properties (aggregate’s physical and mechanical properties, layer thickness, and compaction) and on the types of materials below the subballast (capping layer and subgrade). The interaction between all these geotechnical parameters governs the overall load-bearing behaviour of the railway trackbed. Predicting the real-world results of various combinations of the aforementioned parameters is often difficult. The main objective of this study is to assess the load-bearing capacity of a railway trackbed (top of the subballast layer) by performing a cyclic plate loading test (NF P 94-117-1). A methodology implementing a numerical modelling approach is proposed. The continuum-based numerical model is 2D-axisymmetric, using the commercial software FLAC2D. A numerical procedure simulating the 2-stage plate loading test is developed. A wide range of trackbed layer configurations are simulated, leading to a numerical estimation of its bearing capacity.

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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: 7 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 18.2 Assessment of the Bearing Capacity of a Subballast Layer Using a Numerical Model in a Railway Context O. Jenck¹, F. Emeriault¹, M. Dangeard², O.A. Yaba², A. Dhemaied², J.-M. Cornet² and A. Schwager-Guillemenet² ¹3SR Laboratory, CNRS, Grenoble INP, Université Grenoble Alpes, Grenoble, France ²Direction Générale Industrielle et Ingénierie - DTR-GC VA - PGRN, SNCF Réseau, La Plaine Saint-Denis, France doi:10.4203/ccc.7.18.2 Full Bibliographic Reference for this paper O. Jenck, F. Emeriault, M. Dangeard, O.A. Yaba, A. Dhemaied, J.-M. Cornet, A. Schwager-Guillemenet, "Assessment of the Bearing Capacity of a Subballast Layer Using a Numerical Model in a Railway Context", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 18.2, 2024, doi:10.4203/ccc.7.18.2 Keywords: trackbed mechanical performance, bearing capacity, plate load test, numerical modelling, subballast performance, Ev2 modulus. Abstract Trackbed mechanical quality, and more precisely bearing capacity, is one of the key parameters to plan renewal projects. It depends on the subballast’s properties (aggregate’s physical and mechanical properties, layer thickness, and compaction) and on the types of materials below the subballast (capping layer and subgrade). The interaction between all these geotechnical parameters governs the overall load-bearing behaviour of the railway trackbed. Predicting the real-world results of various combinations of the aforementioned parameters is often difficult. The main objective of this study is to assess the load-bearing capacity of a railway trackbed (top of the subballast layer) by performing a cyclic plate loading test (NF P 94-117-1). A methodology implementing a numerical modelling approach is proposed. The continuum-based numerical model is 2D-axisymmetric, using the commercial software FLAC2D. A numerical procedure simulating the 2-stage plate loading test is developed. A wide range of trackbed layer configurations are simulated, leading to a numerical estimation of its bearing capacity. download the full-text of this paper (PDF, 10 pages, 910 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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