Stress dependent thermal pressurization of a fluid-saturated rock |
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Authors: | S Ghabezloo J Sulem |
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Institution: | (1) Université Paris-Est, Ecole Nationale des Ponts et Chaussées, CERMES-UR Navier, Marne la Vallée, France |
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Abstract: | Summary Temperature increase in saturated porous materials under undrained conditions leads to thermal pressurization of the pore
fluid due to the discrepancy between the thermal expansion coefficients of the pore fluid and of the solid matrix. This increase
in the pore fluid pressure induces a reduction of the effective mean stress and can lead to shear failure or hydraulic fracturing.
The equations governing the phenomenon of thermal pressurization are presented and this phenomenon is studied experimentally
for a saturated granular rock in an undrained heating test under constant isotropic stress. Careful analysis of the effect
of mechanical and thermal deformations of the drainage and pressure measurement system is performed and a correction of the
measured pore pressure is introduced. The test results are modelled using a non-linear thermo-poro-elastic constitutive model
of the granular rock with emphasis on the stress-dependent character of the rock compressibility. The effects of stress and
temperature on thermal pressurization observed in the test are correctly reproduced by the model.
Correspondence: Dr. S. Ghabezloo, CERMES, Ecole Nationale des Ponts et Chaussées, 6-8 avenue Blaise Pascal, Cité Descartes,
77455 Champs-sur-Marne, Marne la Vallée cedex 2, France |
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Keywords: | : Granular rock thermal pressurization pore pressure thermo-poro-elasticity |
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