Gejiu Summit Hill Ore Block Exploitation Of Seepage Field Of Numerical Simulation And The Water Inflow Forecasting

With the rapid development of the technology about prospecting and mining, the deeper deposits had been found, and the harm brought from the prospecting and mining activities increased obviously. So how to make the simulation to the groundwater seepage field and take the prediction of water inflow of the roadway more accuratly can provide the basis for making the reasonable measures to prevent drainage in the roadway construction, and become one of the topics of increasing concern.The paper takes the ore section of Gao-feng mountain in Gejiu mining areas as the research object. On the basis of previous studies, the paper sets up the conceptual model and the mathematical model by means of massive field geological survey and the mineral paragraph hydrogeological characteristics analysis. By using GMS software and the finite difference method, the study takes the numerical simulation to the development and useful life for the middle section of the 1650 and makes the prediction of the changes of the groundwater seepage field and water inflow during the development and useful life to the 1650's middle section. The study shows that:1. The formation's karst petrofabric in ore section, the geological structure, the surficial karst and the groundwater activity control the characteristics of karst development, which controls the hydrogeology characteristics including the division of the aquiferous rock formations, the rules of change to the hydro-geological parameters and the groundwater's recharge, runoff and excretion etc.2. The genetic type of the groundwater's dynamic belongs to the Weather-type and the atmospheric precipitation is the main supply source. The mode of run-off is the Wave-State type and the groundwater's runoff has a certain depth, length and has the obvious vertical zonation. The discharge of groundwater is mainly lateral excretion and the roadway water gushing.3. The study sets up the hydrogeological conceptual model and mathematical model in the simulation area, and by means of repeated calibration and scheduling, which obtained a set of hydrogeological parameters including permeability coefficient and specific yield etc. and realized the actual hydro-geological conditions to ore section of Gao-feng mountain.4. The paper made the prediction through the numerical model:(1) In the 1650's middle section in the opening period of 2008, the water inflow of 1650 roadway is 1.21×106m3, the maximum monthly average inflow of water is 8600 m3/d, the maximum daily inflow is 9100 m3/d. And the water inflow of roadway 1800 is 6.1×104m3, the maximum monthly average inflow is 1000 m3/d, the maximum daily inflow is 1700 m3/d.(2) In the 1650's middle section in the using period of 2009, the water inflow of roadway 1650 is 0.77×106m3, the maximum monthly average inflow of water is 7800 m3/d, the maximum daily inflow of water is 8700 m3/d; but the roadway 1800 had not water inflow obviously(3) After 2010, the groundwater's recharge and excretion will tend to be a balance in the simulation area, and will show the stable morphology, the annual seepage field and the change of water inflow is the same to the situation in 2009 approximately, and will be changed with a small margin by the atmospheric precipitation.