Comparative Analysis Of Hydrogeological Parameters And Prediction Of Discharge In Xiakou Fluorite Mine And Changtai Fluorite Mine In The West Of Zhejiang Province

The mine discharge is the basis of the Production safety design and reasonable development.The reliability of water forecast directly influences the rationality and safety of the mining. At present, researchers mainly using hydrogeologic parameter to forecasting water.The different hydrogeological conditions determines the different hydrogeological parameters, therefore, comparison and analysis of the hydrogeological parameters has important significance in mine.The paper studying hydrogeological parameters of similar geological condition, geomorphic conditions of different mine by pumping test,Xiakou mine and Changtai mine. With big well method, water corridor method, analogy method to predict water inflow. The conclusions are drawn as follows:(1) In the study area, groundwater were divided into three categories: Loose rock pore water;Bedrock weathering fissure water; Tectonic crack water.The embedded depth of groundwater table is shallow,the depth influenced by topography and rainfall. The flow direction of groundwater as same as terrain slope,and watershed of groundwater consistent with surface water. In Xiakou mine, atmospheric precipitation is the main recharging water source, groundwater type is HCO3-Ca, and the hydrogeological conditions is simple. Changtai mine area has a large area of karst collapse, groundwater recharge is given priority to with atmospheric precipitation and surface runoff infiltration, and for the HCO3-Ca-Na water, complicated hydrogeological conditions. Mine water filling sources of atmospheric precipitation, surface water, goaf water, fissure water and water channels for artificial, guide water drilling, all kinds of fractures..(2)The permeability coefficient of hybrid is 0.0446 m/d,conductivity is 4.9m2/d,elastic storage is 5.04×10-3, units-inflow(the drilling diameter is 110mm) is 0.0849 L/s·m. water abundance,in Xiakou mine. The permeability coefficient of hybrid is 0.0337m/d, onductivity is 1.93m2/d, elastic storage is 1.08×10-4, units-inflow(the drilling diameter is 91mm) is 0.0291L/s·m. water abundance in Changtai mine. Xiakou mine is located in the recharge zone, groundwater movement was non-steady state; Changtai mining district is located in the runoff, groundwater movement is steady state. Two mining aquifer(band) are weak rich water, weak permeability, Xiakou mine aquifer(layer) permeability, Water Abundance is stronger than Changtai mine benches.(3) According hydrogeological conditions of the mine, combined with the water inflow variation of the old mining area,Select "catchment corridor method" for the future forecasting of the minimal mine water inflow water inflow, "Simulation Method" for predicting maximum water inflow.The amount of minimum water is 29 m3/d、196.24 m3/d、252.66 m3/d, the amount of maximum water is 73.16 m3/d、206 m3/d、371 m3/d,for elevation of 243 m、203 m、163 m,in Xiakou mine. The amount of minimum water is 228.62 m3/d、190.70 m3/d, the amount of maximum water is 1734 m3/d、3726 m3/d m3/d,for elevation of 74 m、-36 m,in Changtai mine.