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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
Edited by: J. Pombo
Paper 124

Recent Research and Practice of Soil-Reinforcing Technologies for Railways in Japan

F. Tatsuoka1, K. Watanabe2, M. Tateyama2 and M. Okamoto3

1Department of Civil Engineering, Tokyo University of Science, Chiba Prefecture, Japan
2Structural Engineering Division, Railway Technical Research Institute, Tokyo, Japan
3RRR Association; c/o Integrated Geotechnology Institute (IGI) Ltd, Tokyo, Japan

Full Bibliographic Reference for this paper
F. Tatsuoka, K. Watanabe, M. Tateyama, M. Okamoto, "Recent Research and Practice of Soil-Reinforcing Technologies for Railways in Japan", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 124, 2014. doi:10.4203/ccp.104.124
Keywords: bridge abutment, geosynthetic-reinforced soil, GRS integral bridge, high-speed train, nail-reinforced soil, retaining wall, seismic design.

Various types of geosynthetic-reinforced soil (GRS) structure and nail-reinforced soil (NRS) structure were successfully constructed for railways, including highspeed train lines, for the last 25 years. They are: (1) GRS retaining walls (RWs) having staged-constructed full-height rigid (FHR) facing for a total length of 150 km; (2) GRS bridge abutments (more than 50), arranging a girder via a fixed bearing on the top of FHR facing of a GRS RW; (3) four GRS integral bridges with the girder structurally integrated to the top of FHR facings of a pair of GRS RW; (4) box culvert structures, passing under railways, integrated to adjacent geosynthetic-reinforced approach fills; (5) GRS tunnel entrance protections; and (6) RWs constructed by cutting existing ground with the use of large-diameter nails and a pre-installed diaphragm wall for a total length more than 17 km. They are now the standard soil structures employed in place of conventional type soil structures. They were also constructed to restore a number of railway embankments, RWs, bridge abutments and approach fills that collapsed by natural disasters and also to reinforce existing soil structures. NRS Integrated Bridge was developed to reinforce existing old conventional type bridges by reinforcing the approach fills with large-diameter nails and structurally integrating the girder to the top of a pair of abutments.

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