Water Inflow Prediction Of Western Ore Section Of ShanShuYa Phosphorite Mine In Yichang City,Hubei Province

Western ore section of Shashuya phosphorus mine is located in the city of Yichang in Hubei province.The area of western ore section is 7.74km².The stratum of Doushantuo Group Upper Sinian System produce Ph₂² and Ph₁³ industrial phosphorus layer in western ore section of Shashuya phosphorus mine,which Ph₂² is major industrial phosphorus layer and Ph₁³ is secondary industrial phosphorus layer. It will be seen on the plane that Ph₂² and Ph₁³ overlap each other. It will be seen on the section that Ph₂² is located in the upper part of Ph₁³. Between the two layers have rocks, rock thickness range from 0 to 14.94 meters（average value is 9.25mwters）. Ph₂² industrial phosphate layer is buried shallow（163m）, gently inclined（7 degrees）, thin layer（2.67m）, low grade（P₂O₅ content 22.50%）, medium sedimentary phosphate rock deposit（phosphate rock resources reserves 45382kt）.Ph₁³ industrial phosphate layer is buried shallow（176m）, gently inclined（7 degrees）, thin layer（3.78m）, low grade（P₂O₅ content 19.57%）, medium sedimentary phosphate rock deposit（phosphate rock resources reserves 49674kt）. Mining method is underground mining, groundwater will inevitably pose a threat to mining, as far as possible to accurately predict of mine water inflow to the mine has important significance for safety production.This paper wrote based on the field survey and data collection. Collecting and analyzing the data is conducive to understand this mine geological information,such as natural geography, topography, lithology, geological structure and so on.And taking this as the foundation, we analyzing strata rich water, groundwater recharge runoff and discharge conditions, groundwater and surface water hydraulic connections, karst development,the influence of tectonic features effect on groundwater.Summarizing the hydrogeological conditions and researching the water inflow factors for mining.We can use analytical method（Dajing method）, underground runoff coefficient method and hydrogeological analogy method predicting the pit inflow of water and make a comparative analysis.Finally,we will give a more reasonable water inflow for mine drainage design department. The normal value is 19973m³/d, the maximum is 28761m³/d.The forecast results have certain guiding significance for the safe production of the surrounding phosphate mine.