Subcritical Crack Growth in Rocks Under Aqueous Environment

Yoshitaka Nara; Masafumi Takada; Toshifumi Igarashi; Naoki Hiroyoshi; Katsuhiko Kaneko

doi:10.1071/ASEG2007ab100

ISSN: 2202-0586
E-ISSN:

oa Subcritical Crack Growth in Rocks Under Aqueous Environment
Authors Yoshitaka Nara^a, Masafumi Takada^b, Toshifumi Igarashi^c, Naoki Hiroyoshi^d and Katsuhiko Kaneko^e
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^a Hokkaido University, Kita 13 Nishi 8, Sapporo, , Japan, [email protected] ^b Hokkaido University, Kita 13 Nishi 8, Sapporo, , Japan, [email protected] ^c Hokkaido University, Kita 13 Nishi 8, Sapporo, , Japan, [email protected] ^d Hokkaido University, Kita 13 Nishi 8, Sapporo, , Japan, [email protected] ^e Hokkaido University, Kita 13 Nishi 8, Sapporo, , Japan, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab100
- Published online: 01 Dec 2007

Abstract

Summary

Subcritical crack growth is one of the main causes of time-dependent fracturing in rock. In this study, subcritical crack growth in rock was investigated in distilled water (pH=6) and aqueous solution of sodium hydroxide (NaOHaq, pH=12). Especially, comparing the results in water to those in air, the effect of water was investigated. Additionally, the effect of pH in aqueous environment was also investigated. Rock sample were andesite and granite. The relation between the crack velocity and the stress intensity factor was determined by Double-Torsion method. All experiments were conducted with controlling temperature. It was shown that the crack velocities in water were higher than those in air. These results are in accordance with the results by many researchers who reported that the crack velocity increased in water. Comparing the results in NaOHaq to those in water, however, it was shown that the crack velocity at the same stress intensity factor didn’t change even though pH of surrounding environment changed. This result doesn’t agree with conventional concept that the hydroxyl ion accelerates subcritical crack growth in silicate materials. It is concluded that water accelerates the crack velocity and pH has little effect within the environmental conditions in this study.

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References

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Atkinson, B.K., 1984, Subcritical crack growth in geological materials: Journal of Geophysical Research, 89, 4077-4114.
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Kies, J.A. and Clark, A.B.J., 1969, Fracture propagation rates and times to fail following proof stress in bulk glass, in Fracture 1969 – Chapman and Hall, 483-491.
Nara, Y. and Kaneko, K., 2005, Study of subcritical crack growth in andesite using the Double Torsion test, International Journal of Rock Mechanics and Mining Sciences, 42, 521-530.
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Nara, Y., Koike, K., Yoneda, T. and Kaneko, K., 2006, Relation between subcritical crack growth behavior and crack path in granite, International Journal of Rock Mechanics and Mining Sciences, 43, 1256-1261.
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Article Type: Research Article

Keyword(s): Aqueous environment; Double-Torsion method; Rock; Subcritical crack growth; Temperature

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