Effects of principal stress rotation on resilient behaviour in rail track foundations
Effects of principal stress rotation on resilient behaviour in rail track foundations
The design of a railway track substructure requires a realistic understanding of the resilient behavior of the underlying track foundation materials, namely, the subballast and subgrade layers. Currently, the best available method of characterizing the resilient behavior of track foundation materials is through the execution of cyclic triaxial tests, although these do not have the ability to impose principal stress rotation (PSR) on test specimens. A previous paper by the authors demonstrated that PSR increases the rate of permanent strain development. This paper reports on the effects of PSR on the resilient behavior of track foundation materials. Four different reconstituted soils selected to represent typical track foundation materials were subjected to undrained cyclic and torsional shear tests in a hollow-cylinder apparatus. It was established that PSR reduces the resilient modulus of the materials compared with cyclic loading without PSR. The effects of PSR as a function of clay content, overconsolidation ratio (OCR), and consolidation regime (isotropic or anisotropic) were also investigated.
cyclic loads, laboratory tests, shear tests, railroad tracks, stress, resilient modulus
1-10
Grabe, P.J.
bb504678-efda-4320-8f08-1905716b1ebb
Clayton, C.R.I.
8397d691-b35b-4d3f-a6d8-40678f233869
February 2014
Grabe, P.J.
bb504678-efda-4320-8f08-1905716b1ebb
Clayton, C.R.I.
8397d691-b35b-4d3f-a6d8-40678f233869
Grabe, P.J. and Clayton, C.R.I.
(2014)
Effects of principal stress rotation on resilient behaviour in rail track foundations.
Journal of Geotechnical and Geoenvironmental Engineering, 140 (2), .
(doi:10.1061/(ASCE)GT.1943-5606.0001023).
Abstract
The design of a railway track substructure requires a realistic understanding of the resilient behavior of the underlying track foundation materials, namely, the subballast and subgrade layers. Currently, the best available method of characterizing the resilient behavior of track foundation materials is through the execution of cyclic triaxial tests, although these do not have the ability to impose principal stress rotation (PSR) on test specimens. A previous paper by the authors demonstrated that PSR increases the rate of permanent strain development. This paper reports on the effects of PSR on the resilient behavior of track foundation materials. Four different reconstituted soils selected to represent typical track foundation materials were subjected to undrained cyclic and torsional shear tests in a hollow-cylinder apparatus. It was established that PSR reduces the resilient modulus of the materials compared with cyclic loading without PSR. The effects of PSR as a function of clay content, overconsolidation ratio (OCR), and consolidation regime (isotropic or anisotropic) were also investigated.
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Accepted/In Press date: 7 August 2013
e-pub ahead of print date: 10 August 2013
Published date: February 2014
Keywords:
cyclic loads, laboratory tests, shear tests, railroad tracks, stress, resilient modulus
Organisations:
Infrastructure Group
Identifiers
Local EPrints ID: 360572
URI: http://eprints.soton.ac.uk/id/eprint/360572
ISSN: 1090-0241
PURE UUID: 7de7d4bc-f98c-4a47-8984-46ae6a8ec963
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Date deposited: 18 Dec 2013 11:41
Last modified: 15 Mar 2024 03:04
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Author:
P.J. Grabe
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