JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV MINE GROUND CONTROL Previous Question Paper (February/March-2022 - R16)

Modern ground control practices in mines have shifted from reactive support systems to proactive, data-driven strata management. These practices integrate advanced monitoring technologies, numerical modeling, and high-performance support materials to ensure stability in increasingly complex mining environments.

Key ground control practices include:

• Real-time Geotechnical Monitoring: Utilizing Micro-seismic monitoring systems to detect rock mass fracturing and stress redistribution in deep mines. Automated convergence meters and wireless extensometers provide continuous data on roof and rib movement, allowing for early warning of potential instabilities.
• Numerical Modeling and Simulation: Employing 3D finite element and boundary element software to predict stress concentrations around excavations. This allows engineers to optimize mine layout, pillar dimensions, and extraction sequences before physical mining begins, minimizing the risk of rock bursts or pillar failure.
• Advanced Support Systems: The use of high-capacity, yieldable support elements such as dynamic rock bolts, cable bolts, and specialized mesh. These systems are designed to absorb energy during seismic events or sudden strata deformation, providing better containment than rigid support.
• Strata Reinforcement and Grouting: Implementing resin-injection and chemical grouting techniques to consolidate fractured rock masses. This improves the rock mass rating (RMR) and creates a self-supporting arch, which is critical in weak or faulted ground conditions.
• In-situ Stress Measurement: Regular use of hydraulic fracturing or over-coring techniques to determine the magnitude and orientation of the virgin stress field. This data is essential for designing orientation-sensitive mine layouts that reduce stress-induced damage.
• Remote Sensing and UAVs: Utilizing drone-based photogrammetry and LiDAR scanning to map geological discontinuities and monitor surface subsidence or highwall stability without exposing personnel to hazardous zones.

By combining these technologies, modern ground control moves beyond simple empirical design toward a comprehensive, site-specific management strategy that significantly enhances safety and operational efficiency.