Abstract
Numerical modeling of complex rock engineering problems involves the use of various input parameters which control usefulness of the output results. Hence, it is of utmost importance to select the right range of input physical and mechanical parameters based on laboratory or field estimation, and engineering judgment. Joint normal and shear stiffnesses are two popular input parameters to describe discontinuities in rock, which do not have specific guidelines for their estimation in literature. This study attempts to provide simple methods to estimate joint normal and shear stiffnesses in the laboratory using the uniaxial compression and small-scale direct shear tests. Samples have been prepared using rocks procured from different depths, geographical locations and formations. The study uses a mixture of relatively smooth natural joints and saw-cut joints in the various rock samples tested. The results indicate acceptable levels of uncertainty in the calculation of the stiffness parameters and provide a database of good first estimates and empirical relations which can be used for calculating values for joint stiffnesses when laboratory estimation is not possible. Joint basic friction angles have also been estimated as by-products in the small scale direct shear tests.
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Acknowledgments
The support provided by the various mining companies through providing geological data, rock core and/or block samples, and allowing access to the mine to perform field investigations is very much appreciated. The work was funded by the NIOSH of the Centers for Disease Control and Prevention (Contract No. 200-2011-39886). We also thank two anonymous reviewers for their critique which helped improve the paper.
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Kulatilake, P.H.S.W., Shreedharan, S., Sherizadeh, T. et al. Laboratory Estimation of Rock Joint Stiffness and Frictional Parameters. Geotech Geol Eng 34, 1723–1735 (2016). https://doi.org/10.1007/s10706-016-9984-y
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DOI: https://doi.org/10.1007/s10706-016-9984-y