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Effects of humidity and temperature on subcritical crack growth in sandstone

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Title: Effects of humidity and temperature on subcritical crack growth in sandstone
Authors: Nara, Yoshitaka Browse this author
Morimoto, Kazuya Browse this author
Yoneda, Tetsuro Browse this author →KAKEN DB
Hiroyoshi, Naoki Browse this author
Kaneko, Katsuhiko Browse this author
Keywords: Subcritical crack growth
Sandstone
Double Torsion method
Temperature
Relative humidity
Clay
Issue Date: Apr-2011
Publisher: Elsevier
Journal Title: International Journal of Solids and Structures
Volume: 48
Issue: 7-8
Start Page: 1130
End Page: 1140
Publisher DOI: 10.1016/j.ijsolstr.2010.12.019
Abstract: In order to ensure long-term stability of structures in a rock mass, the study of time-dependent fracturing is essential. The influences of the surrounding environmental conditions and rock fabric on subcritical crack growth in sedimentary rocks in air are yet to be clarified, while the nature of subcritical crack growth in igneous rocks has been studied well. In this study, the influences of temperature and relative humidity on subcritical crack growth in Berea sandstone, Shirahama sandstone and Kushiro sandstone were investigated in air. The load relaxation method of Double Torsion (DT) testing method was used to measure both crack velocity and stress intensity factor under a controlled temperature and relative humidity. Results show that the change of the crack velocity at a given stress intensity factor was unclear when the temperature increased under a constant relative humidity in air. On the other hand, we show that the crack velocity increased by several orders of magnitude when the relative humidity increased threefold or fourfold under a constant temperature at a given stress intensity factor. This increase is much larger than that expected from the conventional concept based on the theory of stress corrosion. It is therefore necessary to consider the additional mechanisms for subcritical crack growth in sandstone. The increase of the crack velocity was larger for sandstone which contained larger amount of clays. We conclude that subcritical crack growth in sandstone in air is affected remarkably by the relative humidity and the amount of clays in rock.
Type: article (author version)
URI: http://hdl.handle.net/2115/45104
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 金子 勝比古

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