On the Question of Predicting Deformations in the Vicinity of a Deep Quarry in a Tectonically Stressed Rock Mass
Abstract
One of the key safety concerns at the Kachar open-pit mine – currently exceeding 500 meters in depth – is the management of unstable slopes caused by stress-induced effects. High horizontal compressive stresses in the rock mass have a complex influence on slope stability. To analyze slope behavior as mining progresses toward the projected depth of 760 meters, a comprehensive methodology combining numerical modeling and geodetic monitoring was adopted. This integrated approach leveraged advanced software tools, accurate geomechanical characteristics of the rocks, and a robust representation of the stress-strain state. The principal stresses σ1 and σ3 derived from numerical simulations closely matched field measurements, providing confidence in the model’s validity. Results from in-situ geophysical stress tests confirmed the reliability of the simulation outputs. The dominant failure mode identified was tensile fracturing, initiated by microcrack accumulation that leads to extensive delamination of the rock mass. This insight underscores the need for proactive stability management. The proposed predictive framework offers a dependable geomechanical assessment tool for tracking stress and deformation dynamics in the near-slope zone throughout different phases of mine development. By capturing both physical measurements and simulated behavior, it enhances safety planning and supports informed decision-making.