Research On Prevention And Control Of Mine Water Gushing In Huaneng Yimin Open Pit Mine

Water gushing from open pit has great influence on production and safety of open pit.In this paper,the complicated hydrogeological conditions and the large underground water gushing of Yimin open-pit mine are studied by the methods of mining,numerical simulation and mathematical analysis.This paper summarizes the relevant research status at home and abroad,and makes clear the important influence of pit water gushing on mine safety production.According to the geological situation and mining status of open-pit mine,the three-dimensional seepage model of groundwater is established,the water gushing of open-pit mine is calculated,a variety of groundwater prevention and control schemes are proposed and demonstrated,and the optimal scheme is finally determined on the basis of economic analysis.Based on geological data,the hydrogeological characteristics of aquifer and water-retaining layer are determined,and the main recharge of groundwater is meteoric precipitation.Groundwater in each stratum is mainly runoff along the rock strata,while surface water collects in the low-lying parts of the basin in the form of surface runoff,or penetrates into the Quaternary strata or is discharged by evaporation.Based on the analysis of groundwater sources,a three-dimensional seepage model was established to simulate the pore water pressure.The analysis shows that the excavation of the mine will cause the pore water pressure to form a groundwater level drop funnel.Through the simulation of fault water isolation effect,it is determined that the water isolation fault will be transformed into a water conduction fault when the mining depth of the open-pit mine increases.According to the actual mining situation of the mine,six prevention and control schemes of mine water gushing are put forward and analyzed,and the optimal control scheme is determined by economic analysis.There are 47 figures,43 tables and 86 references in this paper.