Cyclic plastic deformation characteristics of subgrade under moving train wheel load
Dareeju, Biyanvilage, Gallage, Chaminda, Dhanasekar, Manicka, & Ishikawa, Tatsuya (2015) Cyclic plastic deformation characteristics of subgrade under moving train wheel load. In Japanese Geotechnical Society Special Publication, Fukuoka, Japan, pp. 1619-1622.
Cyclic plastic deformation of subgrade and other engineered layers is generally not taken into account in the design of railway bridge transition zones, although the plastic deformation is the governing factor of frequent track deterioration. Actual stress behavior of fine grained subgrade/embankment layers under train traffic is, however, difficult to replicate using the conventional laboratory test apparatus and techniques. A new type of torsional simple shear apparatus, known as multi-ring shear apparatus, was therefore developed to evaluate the actual stress state and the corresponding cyclic plastic deformation characteristics of subgrade materials under moving wheel load conditions. Multi-ring shear test results has been validated using a theoretical model test results; the capability of the multi-ring shear apparatus for replicating the cyclic plastic deformation characteristics of subgrade under moving train wheel load conditions is thus established. This paper describes the effects of principal stress rotation (PSR) of the subgrade materials to the cyclic plastic deformation in a railroad and impacts of testing methods in evaluating the influence of principal stress rotation to the track deterioration of rail track.
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|Item Type:||Conference Paper|
|Keywords:||cyclic plastic deformation, moving wheel load, multi-ring shear apparatus, principal stress rotation, Subgrade|
|Divisions:||Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Facilities:||Science and Engineering Centre|
|Copyright Owner:||Copyright 2015 [Please consult the author]|
|Deposited On:||01 Dec 2015 22:58|
|Last Modified:||17 Feb 2016 06:39|
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