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Temperature and pore pressure effects on the shear strength of granite in the brittle-plastic transition regime

Odedra, A; Ohnaka, M; Mochizuki, H; Sammonds, P; (2001) Temperature and pore pressure effects on the shear strength of granite in the brittle-plastic transition regime. Geophysical Research Letters , 28 (15) 3011 - 3014. 10.1029/2001GL013321. Green open access

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Abstract

Currently published lithospheric strength profiles lack constraints from experimental data for shear failure of typical crustal materials in the brittle-plastic transition regime in wet environments. Conventional triaxial shear fracture experiments were conducted to determine temperature and pore pressure effects on shear fracture strength of wet and dry Tsukuba granite. Experimental conditions were 70MPa < P-C < 480MPa, 10MPa < P-p < 300MPa, 25 A degreesC < T < 480 degreesC, at a constant strain rate of 10(-5)s(-1). An empirical relation is proposed which can predict the shear strength of Tsukuba granite, within the range of experimental conditions. Mechanical pore pressure effects are incorporated in the effective stress law. Chemical effects are enhanced at temperatures above 300 degreesC. Below 300 degreesC wet and dry granite strengths are temperature insensitive and wholly within the brittle regime. Above 400 degreesC, semi-brittle effects and ductility are observed.

Type: Article
Title: Temperature and pore pressure effects on the shear strength of granite in the brittle-plastic transition regime
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2001GL013321
Publisher version: http://dx.doi.org/10.1029/2001GL013321
Language: English
Additional information: Copyright 2001 by the American Geophysical Union
Keywords: Westerly granite, Experimental deformation, Laboratory experiments, Law, Failure, Rock, Lithosphere, Stress, Limits
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction
URI: http://discovery.ucl.ac.uk/id/eprint/27098
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