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.
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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 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 > Dept of Earth Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/27098 |
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