COMPARISON OF STRENGTH-BASED ROCK BRITTLENESS INDICES WITH THE BRITTLENESS INDEX MEASURED VIA YAGIZ'S APPROACHES
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Date
2022
Authors
Yermukhanbetov, K
Yazitova, A
Yagiz, S
Journal Title
Journal ISSN
Volume Title
Publisher
Mechanics and Rock Engineering, from Theory to Practice
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.
Description
Keywords
Type of acess: Open Access, Rock brittleness
Citation
Yermukhanbetov, K., Yazitova, A., & Yagiz, S. (2021). Comparison of strength-based rock brittleness indices with the brittleness index measured via Yagiz’s approaches. IOP Conference Series: Earth and Environmental Science, 833(1), 012038. https://doi.org/10.1088/1755-1315/833/1/012038