A Practical Nonlinear Strength Criterion for Rock Masses and Other Geological Materials

DOI

10.2991/978-94-6463-258-3_63How to use a DOI?

Keywords

Rock Mass Strength; Nonlinear Shear Strength; Rock Mechanics

Abstract

Rock mass strength is a required input parameter for many types of analysis in both mining and civil engineering. This paper introduces a nonlinear formulation of the CNI method, an empirical rock mass strength criterion based on quantitative input parameters. Most of the input parameters to the CNI method are physical properties that can be directly measured in the laboratory or core shed. The nonlinear criterion is formulated in terms of compressive strength, friction angle, and a curvature coefficient. To determine typical values for the curvature coefficient, the generalized form of the nonlinear criterion is fit to published testing of intact hard rock, weak rock, saprolite, rock joints, rockfill, and sand. The nonlinear criterion is shown to effectively model all material types considered and provides a basis for empirical estimation of the curvature coefficient for rock mass. The strength criterion is evaluated for a range of rock mass conditions and compared to the generalized Hoek-Brown criterion. A calculation sheet that implements the nonlinear methodology is presented and shared for digital download.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - S. D. Cylwik
AU  - J. R. Killian
AU  - P. F. Cicchini
PY  - 2023
DA  - 2023/11/08
TI  - A Practical Nonlinear Strength Criterion for Rock Masses and Other Geological Materials
BT  - Proceedings of the Rocscience International Conference  (RIC 2023)
PB  - Atlantis Press
SP  - 681
EP  - 699
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-258-3_63
DO  - 10.2991/978-94-6463-258-3_63
ID  - Cylwik2023
ER  -