Assessment of brittleness using rock strength and density with punch penetration test

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

Brittleness fracturing of rock is one of the most popular research areas in rock engineering, since some rocks show brittle fractures under loads. Direct standard testing method for measuring rock brittleness have not available yet. Therefore, rock brittleness is indirectly obtained as a function of rock strength. The aim of this study is not only to introduce direct method to measure rock brittleness as an index via punch penetration test, but also to investigate the relationship between intact rock properties (uniaxial compressive strength, Brazilian tensile strength, and density of rock) and the brittleness measured from the test. To obtain these objectives, rock cores were gathered from 48 tunnel projects throughout the world. Followings the sampling, the samples were prepared and relevant rock tests were carried out to establishment of dataset at the Earth Mechanics Institute of Colorado School of Mines in the USA. Consequently, using generated dataset, new brittleness index (BIm) and rock brittleness classification was introduced base on type, strength and density of rock together with result of punch penetration test. Further, the rock brittleness index was predicted as a function of the uniaxial compressive strength, Brazilian tensile strength and density of rock with correlation coefficient of 0.94.

Original languageEnglish
Pages (from-to)66-74
Number of pages9
JournalTunnelling and Underground Space Technology
Volume24
Issue number1
DOIs
Publication statusPublished - Jan 1 2009
Externally publishedYes

Fingerprint

penetration test
Brittleness
Rocks
rock
tensile strength
compressive strength
Compressive strength
Tensile strength
brittle fracture
testing method
rock property
Brittle fracture
mechanics

Keywords

  • Brazilian tensile strength
  • Brittleness
  • Density
  • Uniaxial compressive strength

ASJC Scopus subject areas

  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

Cite this

Assessment of brittleness using rock strength and density with punch penetration test. / Yagiz, Saffet.

In: Tunnelling and Underground Space Technology, Vol. 24, No. 1, 01.01.2009, p. 66-74.

Research output: Contribution to journalArticle

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