DOI: 10.5593/SGEM2016/B13/S02.031


T. Ficker
Tuesday 6 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 245-252 pp

The present contribution deals with scaling properties of joint rock coefficients that play a crucial role when mechanical stabilities of rock masses are evaluated. The roughness of rock joints essentially influences shear strength of rock masses and thus the assessment of these coefficients is very important. In the current eotechnical practice a visual assessment based on ten two-dimensional profile standards is frequently used.
The visual assessment is rather a subjective procedure. By analyzing scaling properties of the joint rock coefficients their fractal character is revealed and their direct connection with fractal dimensions of jointed surfaces is established. On the basis of this fractal scaling relation a new calibration curve for the joint rock coefficients is introduced. The new calibration curve fulfills all necessary properties following from the fractal self-affine profiles of jointed surfaces and enables the direct numerical calculation of joint rock coefficients without any visual assessment.

Keywords: Rock joints, asperities, joint rock coefficients, scaling properties, fractal
dimensions, calibration curves.