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Combined effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rocks

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Title: Combined effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rocks
Authors: Funatsu, T.1, Seto, M.2 m-seto@aist.go.jp, Shimada, H.1, Matsui, K.1, Kuruppu, M.3
Source: International Journal of Rock Mechanics & Mining Sciences. Sep2004, Vol. 41 Issue 6, p927-938. 12p.
Subjects: Fracture fixation, Temperature, Climatology, Methodology
Abstract: In order to understand the effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rock, fracture toughness experiments were carried out at temperatures elevated from room temperature up to 200°C using single edge-notched round bar in bending (SENRBB) and semi-circular bend (SCB) specimens of Kimachi sandstone and Tage tuff. This paper describes the methodology for evaluating level 1 fracture toughness and the crack growth resistance curve. The crack growth resistance curve is shown to yield true fracture toughness even when under-sized specimens are employed. The under-sized specimens refer to those which are too small to produce valid fracture toughness value using the standard methods.The fracture toughness of Kimachi sandstone did not vary significantly with temperature up to 125°C, but above that point, it increased with temperature. SENRBB tests showed that the level 1 fracture toughness increased by approximately 40% at 200°C over its value at room temperature. The fracture toughness of sandstone and tuff was found to be significantly affected by increasing confining pressure. For example, in the arrester orientation, the fracture toughness of Kimachi sandstone increased by approximately 470% at 9 MPa confinement over its value at atmospheric pressure. A quite similar variation of fracture toughness is caused by the combined effects of temperature and confining pressure. For example, under a confining pressure of 7 MPa, the fracture toughness of sandstone decreased with temperature up to 75°C, and then increased between 75°C and 100°C. [Copyright &y& Elsevier]
Copyright of International Journal of Rock Mechanics & Mining Sciences is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 13905277
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Combined effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rocks
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  Data: <searchLink fieldCode="AR" term="%22Funatsu%2C+T%2E%22">Funatsu, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Seto%2C+M%2E%22">Seto, M.</searchLink><relatesTo>2</relatesTo><i> m-seto@aist.go.jp</i><br /><searchLink fieldCode="AR" term="%22Shimada%2C+H%2E%22">Shimada, H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Matsui%2C+K%2E%22">Matsui, K.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kuruppu%2C+M%2E%22">Kuruppu, M.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Rock+Mechanics+%26+Mining+Sciences%22">International Journal of Rock Mechanics & Mining Sciences</searchLink>. Sep2004, Vol. 41 Issue 6, p927-938. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Fracture+fixation%22">Fracture fixation</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Climatology%22">Climatology</searchLink><br /><searchLink fieldCode="DE" term="%22Methodology%22">Methodology</searchLink>
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  Label: Abstract
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  Data: In order to understand the effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rock, fracture toughness experiments were carried out at temperatures elevated from room temperature up to 200°C using single edge-notched round bar in bending (SENRBB) and semi-circular bend (SCB) specimens of Kimachi sandstone and Tage tuff. This paper describes the methodology for evaluating level 1 fracture toughness and the crack growth resistance curve. The crack growth resistance curve is shown to yield true fracture toughness even when under-sized specimens are employed. The under-sized specimens refer to those which are too small to produce valid fracture toughness value using the standard methods.The fracture toughness of Kimachi sandstone did not vary significantly with temperature up to 125°C, but above that point, it increased with temperature. SENRBB tests showed that the level 1 fracture toughness increased by approximately 40% at 200°C over its value at room temperature. The fracture toughness of sandstone and tuff was found to be significantly affected by increasing confining pressure. For example, in the arrester orientation, the fracture toughness of Kimachi sandstone increased by approximately 470% at 9 MPa confinement over its value at atmospheric pressure. A quite similar variation of fracture toughness is caused by the combined effects of temperature and confining pressure. For example, under a confining pressure of 7 MPa, the fracture toughness of sandstone decreased with temperature up to 75°C, and then increased between 75°C and 100°C. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of International Journal of Rock Mechanics & Mining Sciences is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Climatology
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              Text: Sep2004
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