201 Figure 6 - Division of the model into smaller geomechanical structures (zoning used for calibration): - Undisturbed rock mass, - Large pillars, - Technological pillars, - Goaf/backfilled (liquidation) zone Calibration was executed in three iterations. The final (third) iteration provided satisfactory agreement with the measured convergence values across the panel (Figure 7). The validated model was then used for comparative scenario analyses of pillar geometry and identification of zones of elevated geomechanical risk. Figure 7 - Results of convergence measurements (field) and numerical simulations (iterations) used for model validation The final, calibrated parameter set was subsequently used in all scenario simulations to ensure that the comparative assessment reflects realistic in-mine conditions. The calibrated rock (and, where applicable, rock-mass) parameters adopted for the excavation horizon are summarized in Table 2. Table 2 - Calibrated rock and rock-mass parameters adopted for the excavation horizon (final input values used in the numerical model).
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