Abstract: Aiming at the engineering problems of large water inflow，severe equipment corrosion and poor surrounding rock stability in the auxiliary shaft of the southeast ore body of Chambishi Copper Mine in Zambia，this paper carries out research on curtain grouting treatment technology to eliminate water hazard hidden dangers caused by developed dolomite fractures and confined water recharge of multiple aquifers. A nearly rectangular grouting curtain was arranged within the range of 2~30 m around the shaft，with a total of 38 grouting holes constructed. The YST-48RMWHY wireless directional drilling system was adopted to accurately control the borehole trajectory with a trajectory deviation of ± 0.3 m. Combined with the three�stage borehole structure and the segmented downward grouting process，a dynamic grouting control scheme with variable pressure and variable concentration was formulated. Composite grouting materials composed of P.O 42.5 cement，water glass，sawdust and graded aggregate were selected for sealing and reinforce⁃ ment. The engineering practice shows that after treatment，the shaft water inflow decreases to 29 m3 /h with a reduction rate of 79%，the equipment corrosion rate is reduced by more than 80%，and the equipment maintenance cycle is extended from monthly to quarterly. The detected average thickness of the grouting curtain is 12.5 m，the water permeability is 0.08 Lu，and the slurry filling rate reaches 89%. The water lev⁃ els of the second and third aquifers drop by 15.6 m and 12.3 m respectively，which effectively cuts off the hydraulic connection between aquifers. The complete set of curtain grouting technology has reliable treat⁃ ment effect，which can effectively dispose water inrush disasters in deep high-confined aquifers and im⁃prove the working environment of the shaft. It can provide technical reference and engineering demonstra⁃ tion for water prevention and control projects in mines with similar complex hydrogeological conditions.

Key words: Chambishi Copper Mine, auxiliary shaft, curtain grouting, divectional hole, water hazard control