Prediction Of Mine Water Inflow In Maoping Lead-zinc Mine,Yiliang,Yunnan Province

The prediction of mine water inflow is an important basis for determining mine design and production.It is related to mine production safety and cost control,and has a great impact on the economic and technical evaluation of the deposit.In this paper,the basic characteristics of hydrological system are analyzed in detail,the hydrogeological conditions of the mining area are analyzed in depth,and the hydrogeological model of the study area is generalized.The groundwater numerical model of the study area is established by using FEFLOW software,and the groundwater runoff is simulated by the numerical model of groundwater three-dimensional flow.The model is used to predict the water inflow of mines at different mining levels,and the mine water prevention measures are proposed,which provides a scientific basis for mine development.The research results show that:(1)The underground water-bearing system in the mining area is divided into an upper aquifer system and a lower aquifer subsystem.The upper part of the upper water-bearing subsystem is medium-rich in water and poor in water at the bottom.Affected by the long-term drainage of the mine,the upper subsystem has been basically dried out,forming a relatively stable groundwater dewatering flow field with a large depth and a certain range.Controlled by the weak permeable layer in the deep part of the axis of Shimenkan inversion anticline,the confined water in the lower part of the West Wing of the anticline has little influence on the water filling of the deposit in Hedong mining area.(2)Prediction of mine water inflow by numerical method and comparison method.The numerical prediction results show that the total mine water inflow is43865m~3/d at 550 m level,44312m~3/d at 490 m level,47112m~3/d at 430 m level,48007m~3/d at 370 m level,and 44312m~3/d at 410 m level.Normally,the total water inflow in the mining area is 48545m~3/d.It can be used as a basis for mine drainage design in the future.The water inflow from the 430 m,370 m and 310 m horizontal pits in Hedong was estimated by the comparison method.The water inflow from the pit during the flat water period was 45179~47840 m~3/d,which was similar to the numerical method.In the middle section of Hexi 550m,430m,370m and 310m,the water inflow from the pit is estimated to be 12387.71~15060.31 m~3/d.The analogy method can be used as the design reference value.(3)According to the established three-dimensional groundwater numerical model,the balance of water volume and water in each middle pit was calculated,and the water control project of“Interception,water plugging,drainage”system was proposed.