198 within the panel. Figure 2 - Average uniaxial compressive strength of the deposit and surrounding rocks (roof, orebody, floor) used for geomechanical characterization 2.2. Model preparation A large-scale 3D numerical model was developed using the finite element method (FEM) in GTS NX to reproduce stress redistribution and deformation associated with roomand-pillar mining with roof deflection. The model geometry and stratigraphy were built based on available exploration and mine geological data in the vicinity of the panel. The numerical domain was set to approximately 1.5 × 1.5 × 1.0 km to properly capture far-field stiffness contrasts and boundary effects influencing the mining horizon. Three mining-layout scenarios were analysed, differing in the geometry of technological pillars (4×4 m, 5×6 m, 8×8 m). In all scenarios, remnant pillars in the liquidation/goaf zone were kept consistent (4×3 m) to ensure comparability between variants. Figure 3 - Considered exploitation scenarios with marked stages of mining front line dolomite sandstone Lithological profile Mining profile anhydryte dolomite sandstone roof floor ore -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 40 80 120 160 200 H [m] Rc [MPa] -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 2 4 6 8 10 H [m] Rr [MPa] -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 10203040506070 H [m] Es [GPa]
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