Estimating the unconfined compressive strength of intact rocks from Equotip hardness |
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Authors: | Hisashi Aoki Yukinori Matsukura |
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Affiliation: | (1) Life and Environmental Sciences, University of Tsukuba, Tsukuba Ibaraki, 305-8572, Japan;(2) Daito Bunka University, Higashimatsuyama Saitama, 355-8501, Japan |
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Abstract: | In order to utilize the Equotip hardness tester, originally developed in the field of metallic engineering, as an indirect
method to predict the unconfined compressive strength (UCS) of rock, laboratory tests were undertaken to establish the UCS,
Equotip hardness (L-value) and porosity of nine rock types. Using existing data from Verwaal and Mulder (Int J Rock Mech Min Sci Geomech Abstr
30:659–662, 1993) and the results of laboratory tests, an equation relating UCS (MPa) and L-value obtained from single impacts (L
s) and porosity (n %) was derived, which provides a close approximation of the UCS value. An equation to relate UCS and Equotip hardness is
also presented, although this is less accurate. It is considered Equotip testing has advantages over the commonly used Schmidt
hammer test.
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Keywords: | Equotip hardness tester Intact rocks Rock hardness Unconfined compressive strength |
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