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Keywords: stress invariant
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Proceedings Papers

Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-035
... of a phenomenon that causes the elastic modulus to vary with the first stress invariant; effectively the confinement provided to the rock fabric. Measurements indicate that the elastic modulus in coal measure strata (elastic modulus range 3 GPa to 40 GPa) typically doubles in magnitude from an unconfined state...

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