考虑围压效应的修正软岩热弹黏塑性本构模型

doi:10.13722/j.cnki.jrme.2015.0046

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Abstract Large amount of triaxial shear experimental evidences show that the mechanical behaviour of soft rock is dependent on the confining stress. The strain softening and shear dilation of soft rock were reduced with the increase of the confining stress. When the confining stress is large enough，the strain hardening and shear contraction occur. The original thermo-elasto-viscoplastic model for soft rock has different parameters for different confining stresses and is therefore difficult to be applied to engineering problems. In order to describe the mechanical behaviour of soft rock with one set of parameters，the original constitutive model was modified to consider the confining stress dependence. The parameters of the modified model have explicit physical meanings and can be determined from triaxial tests. The accuracy of the modified model was verified by comparing with the simulated results and experimental data.

Key words： rock mechanics soft rock confining pressure themo-elasto-viscoplasticity constitutive model

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0046 OR http://www.rockmech.org/EN/Y2016/V35/I2/225

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