| The problem of water filling in Karst deposits is one of the common problems in mining engineering.The water inflow of roadway is the main basis for mining design and mining departments to choose mining plans and mining methods,and formulate measures for prevention and control of water draining.The correct evaluation of the water inflow of the mine laneway is of great significance to reducing the production cost and ensuring the safe production of the mine.The geological structure of The mining area of the Dong Jia Zhai mine of Yunnan Xi Yi lead-zinc mine is very well developed,the carbonate rocks are widely distributed,and the ore deposits are multilayered karst and the hydrogeological conditions are complex.Orebody is mainly distributed in the elevation of 1630m-850 m,is divided into upper mining area,central mining area and lower mining area,from top to bottom is divided into 15 section,The mining area is to be exploited in two middle section,which are produced at the same time.The middle section of 1330 M and 1150 M are first exploited in this mine.The purpose of this work is to find out the characteristics of karst development in complex karst mining areas,to divide the karst development zones,to analyze the water filling conditions of the mining laneways and to determine the hydrogeological parameters.using numerical simulation method to predict the water inflow in the the middle section of 1330 M and 1150 M,so as to provide hydrogeological basis for the optimization design of mine mining scheme.The main research contents of this paper are as follows:(1)Through the investigation of hydrogeological detail,made a large number of reliable hydrogeological data and observation data.On the basis of previous studies,we divided the aquifer group and hydrogeological unit into a reas onable division.The groundwater chemical composition of each aquifer in the mining area is systematically analyzed,and the recharge,runoff and drainage conditions and dynamic change characteristics of groundwater in the mining area are fully understood.(2)Investigation and statistics of Plane characteristics of karst depression development indicate that the development of joints and fractures is particularly obvious in controlling the surface karst morphology.(3)It is mainly through drilling to find out the development of karst in deep aquifers,on the basis of mine profile borehole logging data,combined with the measured surface profile,to research on the karst vertical layered deposits,rational division of Karst Zone,the Xiangshan Group developed 4 karst zone,Heyuanzhai Group developed 2 karst zone.(4)The water filling conditions in the middle section of 1330 M and 1150 M are analyzed in combination with the development scheme of well and roadway.The water filling source of the mine roadway is atmospheric rainfall,surface water and groundwater,and the fractured water in the karst development zone is the direct water filling source of the roadway.The main channel of tunnel water filling is fault and fissure channel.The water filling strength of laneway mainly depends on the water rich degree of directly water filled aquifers,and is obviously influenced by the permeability of the surrounding rock and the relative aquifers.(5)The stratified pumping test of different aquifers is carried out to o btain the permeability coefficient of each aquifer,which provides the basis for the value of the parameter stratified partition in the establishment of the numerical model.Based on the investigation of surface karst depression,the measurement of rock fissure and the drawdown of pumping test,the permeability tensor is determined.The results obtained by the three methods are basically the same.(6)In view of the multi karstic aquifer deposits,the natural water level of different karst aquifers is observed hierarchically,and the numerical model is identified by stratification.The pumping holes ZK3 and ZK5 carry out hierarchical group pumping test,record the corresponding level observation hole water level change,and verify the model.(7)Based on the hydrogeological conditions of system analysis of hydrogeological unit on the generalized under different mining conditions mine hydro geological conceptual model.useing the GMS groundwater numerical simulation software to establish the three-dimensional numerical model of groundwater in the mining area,and useing the verified model to simulate the groundwater seepage field under different mining conditions,and predict the water inflow in the middle section of 1330 M and the middle section of 1150 M under different mining conditions.The results show that the water inflow under the condition of plugging Maqiao River is 19.96% less than the natural condition.and the water inflow under the condition of plugging Maqiao River and fault F1 is 23.61% less than the natural condition. |
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