Effects of Principal Stress Rotation on Permanent Deformation in Rail Track Foundations
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- 1 April 2009
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of Geotechnical and Geoenvironmental Engineering
- Vol. 135 (4), 555-565
- https://doi.org/10.1061/(asce)1090-0241(2009)135:4(555)
Abstract
A realistic assessment of the whole life cost of rail track foundations requires analysis of the effects of the repeated loadings applied by trains. This paper reports the effects of principal stress rotation (PSR) during cyclic loading on the permanent deformations measured in a series of hollow cylinder tests. The tests were carried out on a number of reconstituted soils selected in order to simulate foundation materials on an existing heavy haul railway line. Typical loadings and track geometry together with dynamic finite-element analyses were used to define representative stress changes to be applied to these soils, which were then tested with and without principal stress rotation during loading. It is shown that principal stress rotation has a significant and deleterious impact on permanent deformation of some materials. Therefore, it is concluded that cyclic triaxial testing, which cannot impose principal stress rotation, will not necessarily give good estimates of the long-term performance of rail track foundations. As PSR cannot be ignored when evaluating permanent displacements of rail track foundations, the use of more appropriate (realistic) testing methods such as the cyclic hollow cylinder or the cyclic simple shear apparatus is required.Keywords
This publication has 19 references indexed in Scilit:
- Shear strength anisotropy of natural London ClayGéotechnique, 2007
- A Rational Method for Design of Railroad Track FoundationSoils and Foundations, 2000
- A simple test methodology for soils under transportation routesGéotechnique, 1999
- Corrections for Membrane Strength in the Triaxial TestGeotechnical Testing Journal, 1990
- State-of-the-Art Paper: Hollow Cylinder Torsional Devices: Their Advantages and LimitationsPublished by ASTM International ,1988
- State-of-the-Art Paper: A Reevaluation of Conventional Triaxial Test MethodsPublished by ASTM International ,1988
- Failure and Deformation of Sand in Torsional ShearSoils and Foundations, 1986
- Sand sheared by stresses with cyclic variations in directionGéotechnique, 1986
- A Cyclic Simple Shear Apparatus for Dry Granular MaterialsGeotechnical Testing Journal, 1978
- A hydraulic triaxial apparatus for controlled stress path testingGéotechnique, 1975