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(Article of periodic en Anglais - 2012)

Document title

In situ observation of cracks in frozen soil using synchrotron tomography

Authors(s) and Affiliation(s)

BHREASAIL Á.N. (1) ; LEE P.D. (2) ; O'SULLIVAN C. (1) ; FENTON C.H. (1) ; HAMILTON R. (1) ; ROCKETT P. (2) ; CONNOLLEY T. (3) ;
(1) Dep. of Civil and Environmental Engineering, Imperial College, London, ROYAUME-UNI
(2) School of Materials, Univ., Manchester, ROYAUME-UNI
(3) Diamond Light Source Ltd, Harwell Science & Innovation Campus, Didcot, ROYAUME-UNI

Abstract

Phase-contrast synchrotron micro-computed tomography (μCT) is well suited to studying the microstructure of frozen soil. A miniature temperature-controlled oedometer was used to apply repeated freeze-thaw cycles to water-saturated samples of Leighton Buzzard sand, Reigate sand and spherical glass ballotini (an idealised soil). High-resolution images were obtained using a monochromatic, parallel beam of x-rays generated on Beamline I12 of the Diamond synchrotron. Cracking in the ice was directly measured utilising the phase-contrast fringes generated by ice-air interfaces. Examination of these images revealed two modes of crack formation in the ice phase of frozen soil. Both crack types were orientated parallel to the freezing front (normal to the heat flow), affecting both the frozen soils' mechanical behaviour, and the AA. hypothesise that these cracks are potential initiation sites for ice lens development

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2012, vol. 23, no2 [pp. 170-176]

Bibliographic references : 33 ref.

Collation : 7 fig.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1737

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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