Laboratory investigation on the effect of roughness anisotropy on shear strength of rock fractures
William R Hoyle, Nicholas R MacDonald, Jennifer J Day, Mark S Diederichs
Dans les comptes rendus d’articles de la conférence: GeoSaskatoon 2023: 76th Canadian Geotechnical ConferenceSession: Advanced Testing 1
ABSTRACT: In laboratory direct shear testing of rock fractures, it is current practice to shear an ellipsoidal specimen in the direction of its longest axis, as this allows for the greatest amount of data collection and is assumed to be the direction of shear displacement for unoriented boreholes with inclined, planar joints. However, it is unclear where the shear resistance at this orientation ranks when compared to alternative shear directions, or whether it is the realistic direction of shear encountered in a rockmass. This paper uses 3-Dimensional roughness analysis based on point clouds of fracture surfaces in rock core created using Structure from Motion photogrammetry to calculate the range of potential roughness values. This is then correlated to laboratory testing data on grout replicas of rock fracture surfaces. It is shown that roughness anisotropy has different degrees of impact on shear strength depending on the normal confinement stress and the intact rock strength.
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Hoyle, William R, MacDonald, Nicholas R, Day, Jennifer J, Diederichs, Mark S (2023) Laboratory investigation on the effect of roughness anisotropy on shear strength of rock fractures in GEO2023. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Hoyle_GEO2023_76,
author = {{Hoyle, William R}, {MacDonald, Nicholas R}, {Day, Jennifer J}, {Diederichs, Mark S}}
title = {Laboratory investigation on the effect of roughness anisotropy on shear strength of rock fractures }
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {Laboratory investigation on the effect of roughness anisotropy on shear strength of rock fractures }
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }