TY - JOUR
T1 - Full-Scale Laboratory Testing Of A Geosynthetically Reinforced Soil Railway Structure
AU - Esen, A. F.
AU - Woodward, P. K.
AU - Laghrouche, O.
AU - Čebašek, T. M.
AU - Brennan, A. J.
AU - Robinson, S.
AU - Connolly, D. P.
N1 - Funding Information:
The authors are grateful to the Engineering and Physical Sciences Research Council (EPSRC) for funding this work under Grant Numbers EP/N009207/1, EP/N009207/2 and EP/N009215/1. Tensar and Max-B?gl are also acknowledged for their support with regards to the experimental testing stages.
Publisher Copyright:
© 2021 Elsevier Ltd
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/5
Y1 - 2021/5
N2 - Railway lines typically use traditional sloping embankments as the principal means of track support. However, the use of Geosynthetically Reinforced Soil (GRS) systems have gained popularity as alternatives to conventional embankments, particularly for high-speed lines in Japan. This system requires less ground stabilization/improvement and less land take than conventional embankments due to its smaller base area. This research investigates the immediate and long-term settlement behaviour of a Geosynthetically Reinforced Soil with Retaining Wall (GRS-RW) system subject to cyclic loading for two track forms: a concrete slab track and a ballasted track. First, a three-sleeper concrete slab section is constructed at full-scale under controlled laboratory conditions, followed by a ballasted track. Both are supported on a 1.2m deep subgrade and a frost protection layer in accordance with railway design standards. Two different axle load magnitudes are applied statically, and then cyclically/dynamically, using 6 actuators to replicate moving train axle loads. It is observed that the slab track performs significantly better in terms of elastic and plastic deformation under both static and cyclic loading. Overall, the amplitude of the rail displacement under an individual cycle loading was approximately 25% lower for the slab track and the amplitude of the sleeper displacement on the ballasted track was approximately 6-7 times higher.
AB - Railway lines typically use traditional sloping embankments as the principal means of track support. However, the use of Geosynthetically Reinforced Soil (GRS) systems have gained popularity as alternatives to conventional embankments, particularly for high-speed lines in Japan. This system requires less ground stabilization/improvement and less land take than conventional embankments due to its smaller base area. This research investigates the immediate and long-term settlement behaviour of a Geosynthetically Reinforced Soil with Retaining Wall (GRS-RW) system subject to cyclic loading for two track forms: a concrete slab track and a ballasted track. First, a three-sleeper concrete slab section is constructed at full-scale under controlled laboratory conditions, followed by a ballasted track. Both are supported on a 1.2m deep subgrade and a frost protection layer in accordance with railway design standards. Two different axle load magnitudes are applied statically, and then cyclically/dynamically, using 6 actuators to replicate moving train axle loads. It is observed that the slab track performs significantly better in terms of elastic and plastic deformation under both static and cyclic loading. Overall, the amplitude of the rail displacement under an individual cycle loading was approximately 25% lower for the slab track and the amplitude of the sleeper displacement on the ballasted track was approximately 6-7 times higher.
KW - Ballast and concrete slab track
KW - Full-scale cyclic loading
KW - Geosynthetically reinforced soil
KW - Long-term rail track behaviour
KW - Railway embankment
KW - Railway track settlement
UR - http://www.scopus.com/inward/record.url?scp=85102309157&partnerID=8YFLogxK
U2 - 10.1016/j.trgeo.2021.100526
DO - 10.1016/j.trgeo.2021.100526
M3 - Article
VL - 28
JO - Transportation Geotechnics
JF - Transportation Geotechnics
SN - 2214-3912
M1 - 100526
ER -