Analysis of the damage mechanism of strainbursts by a global-local modeling approach

• DOI: 10.1016/j.jrmge.2022.01.009
• Publication Date: 2022-03-23T17:16:34Z
• Authors: Jun Wang; Derek B. Apel; Artur Dyczko; Andrzej Walentek; Stanisław Prusek; Huawei Xu; Chong Wei
• Keywords: Damage mechanics; Discontinuous Deformation Analysis

Strainburst is the most common type of rockbursts. The research strainburst damage mechanisms helpful to improve and optimize rock support design in burst-prone ground. In this study, an improved global-local modeling approach was first adopted study mechanisms. extracted stresses induced by multiple excavations from a three-dimensional (3D) global model established fast Lagrangian analysis continua 3 dimensions (FLAC3D) are used as boundary conditions for two-dimensional (2D) local deep roadway built universal distinct element code (UDEC) simulate realistic stress loading paths conduct detailed rockburst both micro macro perspectives. results suggest that deformation level gradually increase with growth surrounding caused superposition mining- or excavation-induced panel nearby roadways. significant will result more accumulated strain energy two sidewalls, providing necessary condition occurrence dynamic stage. mechanism site combines three types damage: ejection, bulking, rockfall. During strainburst, initiation, propagation, development tensile cracks play crucial role controlling macroscopic failure masses, although shear crack always accounts main proportion levels. during positively correlate increasing peak particle velocities (PPVs). yielding steel arch might not dissipate kinetic mitigate effectively due limited absorption capacity. principles control proposed paper. This presents systematic framework investigate using approach.