Modeling the zonal disintegration of rocks near deep level tunnels by gradient internal variable continuous phase transition theory

作者：Chen, Haoxiang; Chengzhi, Qi; Liu, Peng; Li, Kairui; Elias C., Aifantis

来源：Journal of the Mechanical Behavior of Materials, 2015, 24(5-6): 161-171.

DOI：10.1515/jmbm-2015-0025

<jats:title>Abstract</jats:title><jats:p>The occurrence of alternating damage zones surrounding underground openings (commonly known as zonal disintegration) is treated as a “far from thermodynamic equilibrium” dynamical process or a nonlinear continuous phase transition phenomenon. The approach of internal variable gradient theory with diffusive transport, which may be viewed as a subclass of Landau’s phase transition theory, is adopted. The order parameter is identified with an irreversible strain quantity, the gradient of which enters into the expression for the free energy of the rock system. The gradient term stabilizes the material behavior in the post-softening regime, where zonal disintegration occurs. The results of a simplified linearized analysis are confirmed by the numerical solution of the nonlinear problem.</jats:p>

• 出版日期2015-12-1
• 单位北京大学