Laboratory and Numerical Investigation of the Hydro-Mechanical Behaviour of the Cobourg Limestone

Abstract of the technical paper/presentation presented at:
DOPAS 2016 Seminar – International topical seminar on plugging and sealing for underground applications
May 25–27, 2016

Prepared by:
G. Su, T.S. Nguyen, Z. Li
Canadian Nuclear Safety Commission
M.H.B. Nasseri, R.P. Young


In Canada, the Cobourg limestone was selected as the host rock for a potential deep geological repository for the management of low- and intermediate-level nuclear waste proposed by Ontario Power Generation. In order to confirm the hydro-mechanical behaviour of the Cobourg limestone, the Canadian Nuclear Safety Commission collaborated with the University of Toronto to perform experimental investigations of its hydro-mechanical behaviour, with special attention to the evolution of hydraulic property with mechanical damage induced by the excavation of the repository. Using the data from the triaxial tests, we developed constitutive relationships for the hydro-mechanical behaviour of the Cobourg limestone and simulated the evolution of permeability with the mechanical damage of the rock.

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