Prediction Of Mine Water Inflow Under Different Mining Schemes

The prediction of mine water inflow is not only the basis for the design of mine safety production(downhole drainage system),but also an important basis for the comprehensive utilization of mine water resources and the design of mine water environment management.Reconciliation with multiple hydrological and geological conditions and multiple mining levels Iron ore,the mine water inflow forecast for each level of mining under different level succession schemes,providing technical support for the mine mining program.Zhongxinji iron ore,located in the southern part of the iron ore concentration area of Huoqiu County,Anhui Province,is a large-scale(total reserves of 151 million tons)sedimentary metamorphic layered iron ore,and the ore body is buried in the deep-140~-600m New Archaic In Huo qiu,there are multiple mining levels and the use of post-filling mining methods.Using the results of mineral exploration,establish a hydrogeological conceptual model and establish a corresponding mathematical model,use the Visual MODFlow software to establish a groundwater flow numerical simulation model,use the pumping test results to identify the model;use the identified model,combined with the mining plan,to carry out the mine pit Water volume forecast.For the level of-160m and-300m of the deposit,a comparison study was carried out on the first-selection-160m scheme and the first-selection-300m scheme.research shows:1.In Zhongxinji iron ore where the lateral recharge is limited and the overlying loose layer’s recharge conditions are generally,in the same mining level,the gushing water content of the mine gradually decreases with the extension of the mining time,The maximum amount of mine water inflow occurs at the beginning of each level of mining.2.The maximum amount of mine water inflow during the whole mining period,the first one is 21686m~3/d,the second one is 16290m~3/d,and the first one is 33%larger than the plan;this is related to the direct water-filled stratum of the ancient weathering crust aquifer of-160m level.3.The average amount of water inflow from the mine during the whole mining period is basically the same(two schemes differ only by 6.5%),which indicates that under this specific hydrogeological condition,different mining schemes affect the water inflow dynamics by affecting the flow field at the level of succession.However,the total impact of the total mining period is small.4.In mines with multiple levels of mining,the maximum amount of water inflow from the succession level should correspond to the groundwater flow field at the succession level,in different levels of succession;for the distribution of the space under the influence of long-term mine drainage The complex groundwater flow field,numerical method can handle this problem more conveniently.