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Geostatistical Evaluation of Fracture Frequency and Crushing

Abstract : This work details how to estimate the Fracture Frequency (FF), ratio of a number of fractures divided by a sample length. The difficulty is that often, a part of the sample cannot be analyzed by the geologist because it is crushed, a characteristics of the rock strength that must also be considered for the Rock Mass Rating. After analyzing the usual practices, the paper describes the (geo)statistical link between fracturing and crushing and the resulting method to obtain a unbiased estimate of FF at a block or point support scale. Some concepts are introduced: "True" FF, "Crushed" FF, crushing probability and crushing proportion. The study is based on a real data set containing more than 13,000 samples. An appendix gives a very general formal demonstration on how to obtain an unbiased ratio estimation.
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Contributor : Serge Antoine Séguret <>
Submitted on : Tuesday, July 1, 2014 - 9:33:03 AM
Last modification on : Wednesday, October 14, 2020 - 3:52:18 AM
Long-term archiving on: : Wednesday, October 1, 2014 - 11:15:30 AM

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Serge Antoine Séguret, Cristian Guajardo Moreno, Ramon Freire Rivera. Geostatistical Evaluation of Fracture Frequency and Crushing. Geomechanical design and geomechanical characterization, Jun 2014, santiago de chile, Chile. pp.280-288. ⟨hal-01009589⟩

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