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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

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.

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