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Y. Momoya, K. Itou, T. Nakamura, "Reuse of Degraded Ballast to Roadbed Improvement", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 44, 2014. doi:10.4203/ccp.104.44

Keywords: roadbed, ballast, recycle, cyclic loading.

Summary

In the case of ballasted tracks on the soft roadbeds, where the bearing capacities are insufficient, track irregularities become larger due to the excessive settlement of sleepers. To reduce the settlement of sleepers, it is effective to improve the roadbed with high-strength material such as well compacted crushed-stone. However, these conventional roadbed improvement methods are not widely applied because their execution costs are high. To deal with this problem, we proposed a new roadbed improvement method that reuses degraded ballast with flash setting cement grout injection. Proposed method reduces the execution cost and working time. To confirm the performance of proposed method, uniaxial compression tests and real scale cyclic loading tests were conducted. On the basis of those test results, the new roadbed improvement method was applied to the site during the train operation. After the application of roadbed improvement at the site, the condition of the track was improved and track irregularity became less.

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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 44 Reuse of Degraded Ballast to Roadbed Improvement Y. Momoya, K. Itou and T. Nakamura Railway Technical Research Institute, Tokyo, Japan doi:10.4203/ccp.104.44 purchase the full-text of this paper Full Bibliographic Reference for this paper Y. Momoya, K. Itou, T. Nakamura, "Reuse of Degraded Ballast to Roadbed Improvement", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 44, 2014. doi:10.4203/ccp.104.44 Keywords: roadbed, ballast, recycle, cyclic loading. Summary In the case of ballasted tracks on the soft roadbeds, where the bearing capacities are insufficient, track irregularities become larger due to the excessive settlement of sleepers. To reduce the settlement of sleepers, it is effective to improve the roadbed with high-strength material such as well compacted crushed-stone. However, these conventional roadbed improvement methods are not widely applied because their execution costs are high. To deal with this problem, we proposed a new roadbed improvement method that reuses degraded ballast with flash setting cement grout injection. Proposed method reduces the execution cost and working time. To confirm the performance of proposed method, uniaxial compression tests and real scale cyclic loading tests were conducted. On the basis of those test results, the new roadbed improvement method was applied to the site during the train operation. After the application of roadbed improvement at the site, the condition of the track was improved and track irregularity became less. 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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