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A method for estimating crack-initiation stress of rock materials by porosity

  • Research Articles
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Journal of the Geological Society of India

Abstract

Crack-initiation stress of a rock under compression is the stress level that marks the initiation of the rock microfracturing process or in other words, the onset of new damage to the rock. This paper proposed a simple methodology with justifications to explore the feasibility of using total and effective porosities as estimators of crack-initiation stress of brittle crystalline rock materials under uniaxial compression. The validity/applicability of the proposed method was examined by an experimental study of granitic materials from Malanjkhand, Madhya Pradesh. It was found that effective porosity depicts better correlation with crack-initiation stress than with uniaxial compressive strength of the granitic materials. On the other hand, total porosity does not show any perceptible correlation with uniaxial compressive strength and crack-initiation stress. Plausible reasons for the nature of the obtained results were also explained in view of rock failure process under compression. It is concluded that following the proposed method, effective porosity can be used as a physical index to obtain a quick estimate of crack-initiation stress of the investigated rocks empirically.

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  1. Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur, 721 302, India

    A. Basu & D. A. Mishra

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  1. A. Basu
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  2. D. A. Mishra
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Basu, A., Mishra, D.A. A method for estimating crack-initiation stress of rock materials by porosity. J Geol Soc India 84, 397–405 (2014). https://doi.org/10.1007/s12594-014-0145-8

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  • DOI: https://doi.org/10.1007/s12594-014-0145-8

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