Numerical Damping Calibration Study of Particle Element Method-Based Dynamic Relaxation Approach for Modeling Longwall Top-Coal Caving

When using the explicit dynamic relaxation approach (DRA) to model quasi-static rock breakage, fragmentation, and flow problems, especially top-coal caving question, introducing numerical damping into solution equation is inevitable for reducing vibration frequency impact speed of mesh nodes, which significantly affect fidelity computation results. Although DRA has been widely adopted simulate caving, reasonable value calibration method are still open issues. In this study, process modeling investigated by comparing with experimental results, in several geometry parameters drawing funnel selected as indexes. The result shows that most 0.07 interval extra-thick coal seams. Finally, correlation between physical discussed. indirectly reflects fragmentation multi scale mass friction interaction particles during process, reduces intensity system dissipates kinetic energy.