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S. Seto¹, T. Ishikawa¹, B. Dareeju², C. Gallage² and B. Luo¹

¹Laboratory of Analytical Geomechanics Division of Field Engineering for the Environment, Faculty of Engineering, Hokkaido University, Sapporo, Japan
²Science and Engineering Faculty, Queensland University of Technology, Brisbane, Australia

doi:10.4203/ccp.110.19

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S. Seto, T. Ishikawa, B. Dareeju, C. Gallage, B. Luo, "Effects of Principal Stress Axis Rotation on Cyclic Plastic Deformation of Unsaturated Railway Roadbed", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 19, 2016. doi:10.4203/ccp.110.19

Keywords: roadbed, moving wheel load, water content, railroad, special shear test.

Summary

The research presented in this paper includes an experimental study to evaluate the synergistic effects of principal stress axis rotation and change in water content on the mechanical behavior of a railway roadbed. This is in order to examine the mechanism of cyclic plastic deformation of railway roadbed subjected to cyclic moving wheel loads at a ballasted track. Three types of tests, namely a static torsional shear test, a single-point loading method and a moving-wheel loading method, were mainly performed with mixed soil which was composed of silica-bentonite sand (silica 74.7%, bentonite 25.3%) and Toyoura sand subject to an air-dried condition and an unsaturated condition. Based on the test results, the influence of water content and moving-wheel loads on the deformation-strength characteristics of geomaterials were examined. The results revealed that the difference in the loading method and water content has a considerable influence on the cyclic plastic deformation of the railway roadbed. This leads to the conclusion that for the precise prediction of the long-term performance of substructures for a ballasted track under cyclic moving-wheel loads, it is important to take into account the synergistic effects of principal stress axis rotation and water content change on the cyclic plastic deformation characteristics of the railway roadbed.

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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: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 19 Effects of Principal Stress Axis Rotation on Cyclic Plastic Deformation of Unsaturated Railway Roadbed S. Seto¹, T. Ishikawa¹, B. Dareeju², C. Gallage² and B. Luo¹ ¹Laboratory of Analytical Geomechanics Division of Field Engineering for the Environment, Faculty of Engineering, Hokkaido University, Sapporo, Japan ²Science and Engineering Faculty, Queensland University of Technology, Brisbane, Australia doi:10.4203/ccp.110.19 purchase the full-text of this paper Full Bibliographic Reference for this paper S. Seto, T. Ishikawa, B. Dareeju, C. Gallage, B. Luo, "Effects of Principal Stress Axis Rotation on Cyclic Plastic Deformation of Unsaturated Railway Roadbed", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 19, 2016. doi:10.4203/ccp.110.19 Keywords: roadbed, moving wheel load, water content, railroad, special shear test. Summary The research presented in this paper includes an experimental study to evaluate the synergistic effects of principal stress axis rotation and change in water content on the mechanical behavior of a railway roadbed. This is in order to examine the mechanism of cyclic plastic deformation of railway roadbed subjected to cyclic moving wheel loads at a ballasted track. Three types of tests, namely a static torsional shear test, a single-point loading method and a moving-wheel loading method, were mainly performed with mixed soil which was composed of silica-bentonite sand (silica 74.7%, bentonite 25.3%) and Toyoura sand subject to an air-dried condition and an unsaturated condition. Based on the test results, the influence of water content and moving-wheel loads on the deformation-strength characteristics of geomaterials were examined. The results revealed that the difference in the loading method and water content has a considerable influence on the cyclic plastic deformation of the railway roadbed. This leads to the conclusion that for the precise prediction of the long-term performance of substructures for a ballasted track under cyclic moving-wheel loads, it is important to take into account the synergistic effects of principal stress axis rotation and water content change on the cyclic plastic deformation characteristics of the railway roadbed. purchase the full-text of this paper (price £22) 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 £85 +P&P)
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