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Some Nonlinear Rock Behavior Effects

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Abstract

The nonlinear rock behavior effects observed in loading diagrams are analyzed which are usually ignored in conventional models of elastoplastic media. The initial deformation stage and unloading of rock samples are considered. The nonlinear behavior on these loading stages is interpreted from the viewpoint of partial closure of cracks initiated during deformation beyond the elastic limit or in earlier loading history. Phenomenological relations are derived to account for the discussed nonlinear effects in numerical modeling. The postcritical deformation stage corresponding to the stage of strain localization and main crack formation is studied. Corrections are made to provide a more accurate determination of model parameters.

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Correspondence to Yu. P. Stefanov.

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Original Russian Text © Yu.P. Stefanov, 2016, published in Fizicheskaya Mezomekhanika, 2016, Vol. 19, No. 6, pp. 54–61.

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Stefanov, Y.P. Some Nonlinear Rock Behavior Effects. Phys Mesomech 21, 234–241 (2018). https://doi.org/10.1134/S1029959918030074

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