Subsurface deformation mechanisms beneath a flexible pavement using image correlation
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Authors
Bowman, A
Haigh, SK
Publication Date
2019Journal Title
Geotechnique
ISSN
0016-8505
Publisher
ICE Publishing
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Bowman, A., & Haigh, S. (2019). Subsurface deformation mechanisms beneath a flexible pavement using image correlation. Geotechnique https://doi.org/10.1680/jgeot.18.P.092
Abstract
Flexible pavement structures are widely used in road construction, especially in circumstances where very high
traffic volumes are not expected. These structures comprise of multiple layers of granular material, generally
having decreasing strength with depth. Failure of these systems is typically observed as rutting on the ground
surface, but the failure instigates at depth. In this research, for the first time, observations can be directly made of
the progressive failure of these deeper layers under repeated wheel loading due to the combination of a new test
apparatus, the Cambridge Accelerated Pavement Tester (APT), and Digital Image Correlation (DIC) technology.
The use of a window allowing observation of soil displacements at depth during repeated wheel loading cycles
allows the progressive failure to be observed and the changes in soil displacements and strains with different layer
thicknesses to be quantified. It was observed that the critical failure mechanisms for thin and thick surficial layers
are different, resulting in changes in the rates of surface rutting. Understanding these deformation mechanisms
potentially allows savings to be made in road or airfield construction by using correctly-sized structural layers.
Sponsorship
none
Identifiers
External DOI: https://doi.org/10.1680/jgeot.18.P.092
This record's URL: https://www.repository.cam.ac.uk/handle/1810/287873
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