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A. Merheb, R. Motta, L. Bernucci, E. Moura, R. Costa, T. Vieira, F. Sgavioli, "Railway Ballast Load Analysis using Small-Scale Cylindrical Triaxial Test", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 131, 2014. doi:10.4203/ccp.104.131

Keywords: parallel gradation, railway ballast, triaxial tests.

Summary

This paper presents results of triaxial testing performed on a ballast material regarding its permanent deformation and degradation behaviour during cyclic loading. The tests simulated a large number of passing train wheels. Materials used in ballast layers are usually comprised of a highly coarse-graded gradation, hence the implementation of large-scale laboratory tests is difficult to conduct due to the corresponding large-scale triaxial specimens for railroad ballast material. The main purpose of this paper was to evaluate the applicability of the parallel gradation technique in triaxial tests, using small-scale cylindrical equipment with 150mm (width) x 300mm (height), in which it is easier to manipulate small fractions, as well as to assess the influence of two different gradations on ballast breakage and permanent vertical deformation. It was found that granular materials reveal a strong tendency to settle under higher stress levels, causing a significant increase of their strength and stiffness. The AREMA No. 24 gradation was found to be the most resistant to ballast settlement. Results of this study confirm that the confining pressure should be considered as an important track design parameter. The results contribute to a better understand of the mechanical behaviour of ballast layers, thus support ongoing researches on railroad structure.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 131 Railway Ballast Load Analysis using Small-Scale Cylindrical Triaxial Test A. Merheb¹, R. Motta¹, L. Bernucci¹, E. Moura¹, R. Costa¹, T. Vieira¹ and F. Sgavioli² ¹Polytechnic School, University of São Paulo, São Paulo, Brazil ²Vale S.A., Vitória, Brazil doi:10.4203/ccp.104.131 purchase the full-text of this paper Full Bibliographic Reference for this paper A. Merheb, R. Motta, L. Bernucci, E. Moura, R. Costa, T. Vieira, F. Sgavioli, "Railway Ballast Load Analysis using Small-Scale Cylindrical Triaxial Test", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 131, 2014. doi:10.4203/ccp.104.131 Keywords: parallel gradation, railway ballast, triaxial tests. Summary This paper presents results of triaxial testing performed on a ballast material regarding its permanent deformation and degradation behaviour during cyclic loading. The tests simulated a large number of passing train wheels. Materials used in ballast layers are usually comprised of a highly coarse-graded gradation, hence the implementation of large-scale laboratory tests is difficult to conduct due to the corresponding large-scale triaxial specimens for railroad ballast material. The main purpose of this paper was to evaluate the applicability of the parallel gradation technique in triaxial tests, using small-scale cylindrical equipment with 150mm (width) x 300mm (height), in which it is easier to manipulate small fractions, as well as to assess the influence of two different gradations on ballast breakage and permanent vertical deformation. It was found that granular materials reveal a strong tendency to settle under higher stress levels, causing a significant increase of their strength and stiffness. The AREMA No. 24 gradation was found to be the most resistant to ballast settlement. Results of this study confirm that the confining pressure should be considered as an important track design parameter. The results contribute to a better understand of the mechanical behaviour of ballast layers, thus support ongoing researches on railroad structure. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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