O'Riordan, N. and Phear, A.
Design and construction control for ballasted track formation and subgrade under high speed lines.
In, Proceedings of the International Conference on Railway Engineering 2001, London, GB,
30 Apr - 01 May 2001.
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The first 75km section of Channel Tunnel Rail Link (CTRL) project, a new high speed railway between London and the Channel Tunnel, is currently under construction in Kent. The earthworks and trackbed layers for the CTRL have been designed in accordance with the International Union of Railways (UIC) Code 719R together with French TGV best practice. The UIC code recommendations for high speed lines are largely based on extrapolating to higher speeds an empirical and prescriptive approach developed from experience on main lines (i.e. up to 200 km/h). To give more assurance to the extrapolated use of UIC Code 719R for high speed lines, analytical and experimental work was carried out including a knowledge of the resilient modulus of the subgrade and for less common soils such as chalk, laboratory determination of the resilient modulus. This paper describes the laboratory cyclic triaxial testing carried out to determine the resilient modulus of chalk recovered from the CTRL route. It also describes the various sets of plate loading tests carried out on site under dry and flooded conditions to confirm the adequacy of this test type. Recommendations are put forward for design and construction control of the trackbed layers for future new high speed lines.
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