Groundwater Flow Numerical Simulation Of Wangjiazhuang Copper Mine In Yantai, Shandong Province

With growth of population, social progress and rapid development of industry, in dailylife and production people’s demand for copper increases. Because of supply and demandrelationship, production of mine expands, and at the same time, safety issues in copperproduction become increasingly prominent. The water inrush caused huge losses to thecountry’s property and people’s lives. Mine inflow has been always a very difficult safetyproblems to be solved,and it troubled mine production. Affected by the meteorological andhydrological characteristics, geological conditions, and mining conditions, forecast formine discharge is a very complex task, meanwhile it is a very important part of DepositHydrogeological exploration. The second ore block of Wangjiazhuang copper mine inFushan District of Yantai city is buried deeply and it’s surrounding rocks are rich ingroundwater. Both of the features are a larger threat to mining. Therefore, it has veryimportant and realistic significance for reasonable mining and safe production to forecastfor mine discharge accurately and put forward the countermeasure to reduce mine inflowaccidents.Wangjiazhuang copper mine surrounding rocks are mainly silicide marble withgraphite of Jutun Group’s second part （Pt₁fJ²）, two-mica schist clipped with biotite granuliteand Tremolite marble of Gangyu Group （Pt₁fG）. In profile, the fracture-karst of JutunGroup’s second part more developed than that of Gangyu Group. Besides, water yieldproperty and water permeability of Jutun Group’s second part are better. On the plane, areaalong Zhangcun River are rich in water, while water yield property of area on the river’sboth sides and mountain area decreases gradually. According to the hydrogeologicalconditions in mining area, rules of groundwater recharge, runoff, discharge and dynamiccharacteristics of underground water, the study area is generalized double-aquifers systemwith heterogeneous isotropic fracture karst aquifer formed with the second type ofboundary and three-dimensional seepage. Based on the conceptual model of hydrogeology and feature of mine drainagedescending deep, this paper establishes a three-dimensional numerical model ofgroundwater flow. On the plane, rectangular grid mesh is uesd, meanwhile it is properlyencrypt near pumping wells. At last, it is divided into44rows and52columns, whilevertical section is divided into2layers. Model identification uses two sets of data, whichare a group drilling pumping test data and dynamic monitoring data of nearly a year. Afterdebugging and calibration, groundwater dynamic curve and level contour of the study areaboth fit well, which shows that the model has a high reliability.According to existing conditions of the deposit, this article forecasts the mine drainagewater and normal water inflow at different mining levels:-80m,-200m,-300m,-400m,-450m with the corrected model. And the conclusion is that normal water inflow at abovelevel are respectively7300m³/d,13800m³/d,27900m³/d,37000m³/d,41400m³/d.