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Temperature increase in saturated porous materials under undrained conditionsleads to thermal pressurization of the pore fluid due to the discrepancybetween the thermal expansion coefficients of the pore fluid and of the solidmatrix. This increase in the pore fluid pressure induces a reduction of theeffective mean stress and can lead to shear failure or hydraulic fracturing.The equations governing the phenomenon of thermal pressurization are presentedand this phenomenon is studied experimentally for a saturated granular rock inan undrained heating test under constant isotropic stress. Careful analysis ofthe effect of mechanical and thermal deformation of the drainage and pressuremeasurement system is performed and a correction of the measured pore pressureis introduced. The test results are modelled using a non-linearthermo-poro-elastic constitutive model of the granular rock with emphasis onthe stress-dependent character of the rock compressibility. The effects ofstress and temperature on thermal pressurization observed in the tests arecorrectly reproduced by the model.

Stress dependent thermal pressurization of a fluid-saturated rock