Comparison of strength-based rock brittleness indices with the brittleness index measured via Yagiz's approaches

K. Yermukhanbetov, A. Yazitova, S. Yagiz

Research output: Contribution to conferencePaperpeer-review

Abstract

Rock brittleness is one of the most significant properties of rock having a major impact not only on the failure process of intact rock but also on the response of rock mass to rock excavation. In fact, the brittleness is a combination of rock properties including not only the uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) but also density and porosity of rocks. Due to that, the brittleness should be examined very carefully for any excavation projects, i.e., mechanized excavation, drilling and blasting. The aim of this paper is to compare the strength-based brittleness indices with both the rock brittleness index (BIo), directly obtained via punch penetration test (PPT) and also estimated via Yagiz's approach (BI1) as a function of strengths and density of rocks. For the aim, database including more than 45 tunnel cases are used to compute common rock brittleness indices (BI2, BI3, BI4), different combination of UCS and BTS. Further, these indices are compared with both BIo and BI1 as well as each other. It is found that the BIo and BI1 have a significant relations (ranging of determination coefficients (r2) from 0.69 to 0.88 with strength-based brittleness indices commonly used in practice. Also, based on findings, several rock brittleness classifications are also revised herein.

Original languageEnglish
DOIs
Publication statusPublished - Sep 6 2021
EventEUROCK 2021 Conference on Rock Mechanics and Rock Engineering from Theory to Practice - Turin, Virtual, Italy
Duration: Sep 20 2021Sep 25 2021

Conference

ConferenceEUROCK 2021 Conference on Rock Mechanics and Rock Engineering from Theory to Practice
Country/TerritoryItaly
CityTurin, Virtual
Period9/20/219/25/21

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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