110 each affected zone within a mine. This paper focuses on the applications and benefits of injection and consolidation technologies across typical underground mining scenarios, highlighting results from field cases and the integrated approach required to tackle these challenges effectively. 2. Geotechnical challenges in underground mines and injection solutions 2.1 Water ingress control: water entering mine workings can degrade rock strength, erode support, and slow production. High inflows may flood stopes or tunnels, require expensive pumping and causing downtime. Traditional drainage methods (like sumps and pumping) often struggle when water inflow is large or under pressure. Here, pregrouting and water-stopping injections are invaluable. Pre-excavation grouting involves drilling boreholes ahead of a tunnel face or around a shaft and injecting cementitious grout to seal permeable fractures and pores. This creates a curtain that controls water inflow and limits groundwater drawdown around the excavation (Barton & Quadros, 2019). For instance, at a deep metal mine with known aquifers along a drift path, microfine cement injections reduced water inflows to a trickle, allowing excavation to continue on schedule (Barton & Quadros, 2019). In cases of emergency water inflows or where immediate action is needed, water-reactive polyurethane resins are often used. These resins expand upon contact with water, rapidly plugging leaks and fissures. Mines have effectively deployed fast-foaming polyurethane to stop sudden inrushes through faults or drillholes, restoring dry conditions within minutes (Hildreth et al., 2020). By moving water out of critical areas and sealing off its pathways, injections enable other support (such as shotcrete liners or rock bolts) to perform as intended without being undermined by erosion or hydrostatic pressure. Figure 1. Water ingress in a front face of a mining Gallery before and after injection. 2.2 Weak or fractured ground stabilization: many underground deposits lie within rock masses that are heavily jointed, faulted, or altered to weaker minerals (clays, talc, etc.). Such ground may lack the competency to stand safely after blasting, leading to frequent falls of ground or excessive dilution as surrounding waste collapses into stopes. Rock bolts and mesh attempt to bind and hold these rocks, but if the rock is highly fragmented
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