The Elastoplastic Solutions of Deep Buried Roadway Based on the Generalized 3D Hoek-Brown Strength Criterion considering Strain-Softening Properties

The deep underground roadways are widely used in the mining industries at present, but relevant theoretical bases not fully understood. In this paper, numerical solutions for strain-softening surrounding rock under generalized three-dimensional (3D) Hoek-Brown (GZZ) strength criterion developed incorporating confinement-dependent characteristics of ψ and id="M2"> η ∗ their influences on stress displacement equivalent circular roadway. On basic a finite difference, method model is proposed to consider variation id="M3"> id="M4"> analyzing behavior masses. Combining equilibrium equation criterion, conditions each annulus calculated analytically. step obtained analytically by solving differential through invoking flow rule Hooke’s law. accuracy verified comparison between results previous studies. effect intermediate principal GZZ considered; rationality two aspects. First, comparing with two-dimensional narrow H-B advantage that considers main highlighted. other hand, compared linear D-P research roadway coal mine show plastic zone can reduce pressure rock, it will greatly increase its deformation. high field areas, key reason destruction It suggested design calculation support system roadway, should be considered, which very important avoid large deformation damage