Analysis Of Water Filling Conditions And Prediction Of Water Inflow In Zhongguan Iron Mine

Zhongguan Iron Mine is located in Shahe City,Xingtai Baiquan runoff zone,and it is a large waterflow mine.Due to the limitation of technical conditions,the deposit has not been mined for a long time since its discovery.After the implementation of the fully enclosed curtain grouting project in 2010,Zhongguan Iron Mine has entered a comprehensive development stage.The grouting curtain has played a certain role in blocking water in the process of mine construction,but the underground drainage is still large.At present,the water level in the curtain does not fall below the-230 level required for the first mining,and the source recharge of groundwater in the curtain is unclear.Therefore,it is necessary to further study the water filling conditions in the curtain,simulate and analyze the main sources and channels of underground water gushing,so as to provide a scientific basis for reasonably formulating water prevention measures and ensuring the safety of mine production.Collecting and analyzing the previous geological exploration data,hydrogeology data and curtain grouting data,and combining hydrodynamic force and hydrochemistry to divide the main aquifer groups in the mining area and determine the altered fracture belt and analyze the distribution characteristics and regularities of strong aquifer in curtain.Using water balance method to calculate the average permeability coefficient of curtain.According to the water level dynamic characteristics of the inside and outside observation holes and the hydrochemical characteristics of the main outlet points in the curtain,combining with the spatial distribution law of strata to analyze the main water filling sources of underground water inflow and the possible water inflow channels.Using FEFLOW and comparison method to predict and verify the water inflow in the mining stage.The results showed that after the completion of the curtain,although the supply of regional Ordovician limestone water was effectively reduced,the inside and outside hydraulic connection in the curtain was still relatively close.The water level inside the curtain was mainly affected by the periodic change of groundwater level and mining drainage.In the current mining stage,the water inflow in the curtain was mainly through the curtain belt and the water infiltration around the bottom of the curtain,and a small part was the storage water.The average permeability coefficient of the curtain was calculated to be about 0.03m/d.The FEFLOW software was used to establish a three-dimensional non-structural hydrogeological model,and the numerical method was used to predict the water inflow.The results of numerical simulation and comparison method showed that when the water level dropped to-110m,the water inflow was 23320m~3/d,when the water level dropped to-230m,the water inflow was 30950m~3/d,and when the water level dropped to-245m,the water inflow was 32800m~3/d.The research results can provide reference for groundwater control in mining process.Figure 63;Table 7;Reference 44...