Geomechanical Twin Calibration Excel Template

Geomechanical Twin Calibration bridges the gap between theoretical rock mass models and real-world mine behavior. At its core, the template implements a structured inverse calibration process: users input measured data (e.g., borehole breakout orientations, convergence from extensometers, microseismic event clusters) alongside baseline simulation outputs (e.g., FLAC2D/3D or Phase2 results), then iteratively adjust key input parameters—such as Hoek-Brown strength parameters (mi, s, a), Young’s modulus, Poisson’s ratio, and in-situ stress magnitudes—until model predictions fall within predefined uncertainty bounds (e.g., ±15% error in displacement). The template enforces version-controlled documentation of each calibration iteration, including sensitivity analyses, parameter correlation matrices, and goodness-of-fit metrics (e.g., RMSE, R²), ensuring transparency and regulatory compliance. It also incorporates uncertainty propagation features—using Monte Carlo sampling or Latin Hypercube techniques embedded via Excel’s Data Table or Power Query—to quantify confidence intervals on calibrated parameters. This supports risk-informed decision-making for stope design, ground support selection, and production sequencing in complex, highly stressed orebodies where traditional empirical methods are insufficient.