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TitleAnisotropic properties study of Lac du Bonnet granite specimens: report #7 / Étude des propriétés d'anisotropie des échantillons de granite provenant de Lac du Bonnet : rapport #7
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorJackson, R
SourceCanada Centre for Mineral and Energy Technology, Mining Research Laboratories, Division Report 92-060 (TR), 1992, 75 pages, Open Access logo Open Access
PublisherEnergy, Mines and Resources Canada
Lang.English; French
Mediapaper; on-line; digital
RelatedThis publication is related to the following publications
File formatpdf
Lat/Long WENS -96.0000 -95.5000 50.2500 50.0000
Subjectsengineering geology; Science and Technology; Nature and Environment; bedrock geology; lithology; igneous rocks; intrusive rocks; granites; intrusions; anisotropy; rock mechanics; deformation; boreholes; rock stress analyses; stress patterns; shear stress; strain analysis; drilling; nuclear waste disposal; waste disposal sites; Lac du Bonnet Batholith
Illustrationsschematic representations; tables; plots
Released1992 03 01; 2021 07 14
AbstractCompressive and shear wave velocity measurements, as well as uniaxial compression testing, was conducted on samples obtained from borehole 406-010-S2 located in the Lac du Bonnet batholith near Pinawa, Manitoba. The purpose of the study is to ascertain if any anisotropy in terms of the uniaxial mechanical properties exists in the Lac du Bonnet samples and, if so, to what extent.
The uniaxial, dilational and yield compressive strengths, 25 MPa, 40% and 50% tangent moduli and 40% and 50% Poisson's ratios exhibited maximum anisotropies of 1.34, 1.41, 1.53, 1.51, 1.59, 1.33, 1.38 and 1.22 respectively. Deformation anisotropies are related largely to the existence of micro-cracks in the samples. Four hundred and twenty (420) level results indicated a higher degree of anisotropy in terms of the 50% tangent modulus of elasticity (1.51) than was indicated by a similar test series conducted on samples obtained from the 240 level (1.18). Samples from the higher in situ stress field of the 420 level appear to be more profoundly effected by drilling, stress relaxation and the attendant crack formation and propagation.

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