Numerical Simulation and Prediction of Mine Water A Case Study in Dangtu County of Anhui Province.docVIP

Numerical Simulation and Prediction of Mine Water A Case Study in Dangtu County of Anhui Province 　　【Abstract】In this paper， the regional groundwater flow system in Zhong Jiu iron ore was generalized into three-dimensional unsteady groundwater flow systems with homogeneous， isotropic and no boundary limits. The software of Visual MODFLOW was used to simulate and predict the gushing process. the conclusion was that the calibrated parameters were reasonable and the predicted value can satisfy the demand of the consumption of mining. 　　【Keywords】 Zhong Jiu iron ore， Hydrogeological conditions， Visual MODFLOW， Numerical simulation， Water inflow predicting. 　　Numerical method includes four steps： hydrogeological model conceptualization， building mathematical model， model calibration， mine water inflow predicting ect. 　　1 The Establishment of the Hydrogeological Conceptual Model 　　The mine area was in water-bearing medium that has no obvious water boundary， there are many clear differences among different water-bearing rock groups or even the same ones， but there are still some hydraulic connections. So， the anisotropy aquifer medium that above -370 meters in mining area was identified as the flow field ， which is isotropic and has no confined boundary. 　　In order to reflect the geologic feature，the aquifers were generalized into 10 layers. The simulated range was 143km2 around the mine. The boundary was generalized as general head boundary and the simulation area was regarded as heterogeneous isotropic. The ground water flow was defined as transient flow that obey the Darcys law. 　　2 The Determination of Initial Conditions 　　The initial flow field was drawn based on the date of the water level in december 2009， The ten aquifer groups had different initial flow fields because of the minor differences among them and the minor groundwater exploitation quantities. 　　3 Mathematical Model of Groundwater Flow 　　3.1 Discretization 　　In space， according to geologic