The poro-mechanical response of porous rocks is usually defined by Biot effective stress concept. Gas sorbing rocks such as coal do not however follow the conventional effective stress law because of swelling associated with gas adsorption and therefore, modification to the law is required. The Biot coefficient of non-reactive porous rocks is readily measured by jacketed-unjacketed experiment however, there is no standard definition neither any procedure to characterize the poro-mechanical response of gas sorbing rocks. This extends to jacketed-unjacketed measurements where it is not clear as to what these measurements represent in a gas sorbing rock such as coal sample and how the results should be interpreted.

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