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Evaluating Kinematic Controls on Planar Translational Slope Failure Mechanisms Using Three-Dimensional Distinct Element Modelling

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Abstract

This paper investigates the importance of kinematic release mechanisms on planar translational slope failure using three-dimensional distinct element codes. The importance of the dip and dip direction of the rear, basal and lateral release surfaces and their influence on failure mechanism, dilation, and the development of step-path failures is illustrated. The three-dimensional block shape and volume of the unstable rock masses simulated with the different discontinuity set geometries are characterized. Two assumed three-dimensional slope models are investigated in order to assess the importance of varying kinematic confinement/release mechanisms. These two assumed boundary conditions are shown to be critical in the development of asymmetrical rock mass deformation patterns. Scale effects due to the block size and discontinuity persistence are shown to control the calculated displacement and failure mechanisms. The numerical modelling results are also demonstrated to be sensitive to the assumed normal and shear stiffness of the discontinuities. The influence of the factors investigated on the failure of a single rock block versus a rock mass are compared and discussed.

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Acknowledgments

The authors would like to acknowledge funding from NSERC, Simon Fraser University Graduate Scholarship, and the FRBC Resource Geoscience and Geotechnics Endowment Fund. The authors would also like to thank D. vanZeyl for his assistance with the 3DEC plots.

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Authors and Affiliations

  1. University of Auckland, 23 Symonds Street, Private Bag 92019, Auckland, 1142, New Zealand

    Marc-André Brideau

  2. Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada

    Doug Stead

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  1. Marc-André Brideau
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  2. Doug Stead
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Correspondence to Marc-André Brideau.

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Brideau, MA., Stead, D. Evaluating Kinematic Controls on Planar Translational Slope Failure Mechanisms Using Three-Dimensional Distinct Element Modelling. Geotech Geol Eng 30, 991–1011 (2012). https://doi.org/10.1007/s10706-012-9522-5

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  • DOI: https://doi.org/10.1007/s10706-012-9522-5

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