STUDY ON DYNAMIC CHARACTERISTICS AND INFLUENCING FACTORS OF WATER INFLOW IN DEEP SHAFT OF HUIZE LEAD-ZINC MINE, CHINA

The Huize lead-zinc mine in Yunnan is one of the important mineral resources in the Sichuan-Yunnan-Guizhou mining area. After more than 60 years of mining, the mining shaft has been located below the river erosion level in the mining area. With the depth of mining continuous increase, the risk of mine water inrush greatly increases induced by urface water infiltration, and mine water inrush has become the mostimportant factor restricting production and mining. On the basis of investigate the hydrogeological conditions of the mining area, the dynamic characteristics and influencing factors of water inflow were studied through the analysis of long-term and multi-level tunnel water inflow monitoring data. The results showed that long-term underground mining changed the hydrogeological conditions in the deep part of the mining area, and the middle section of deep mining exposed the aquifer, forming a deeper depression funnel; The water-bearing stratum in the mineral deposit is a karst aquifer with abundant groundwater; The water inflow of mining pits is mainly replenished by the static reserves in the aquifer and water bearing structure, and karst cracks and structural cracks form the groundwater flow pathways in mining area; Lithology, structure, and mining methods are key factors affecting water inflow. The research results provide a foundation for predicting the water inflow of mines and ensuring the safety of deep mining.