Analysis And Prediction On Mine Water Discharge In Shaling Gold Mine

Mine discharge is the inflow water of unit time flowing into mines during the process of mine production and mine construction,it includes all wells and exploitation systems,usually expressed in m~3/h. Prediction of mine discharge is not only the most important work at technical economic evaluation and reasonable development before mining, especially in the production process of mine in the construction measures,but also is the important basis for the mine to make mining plan, drainage measures, prevent water inrush disaster and make full use of groundwater resources in the process of construction.In this paper,aiming at the problem of mine discharge influence on mining and draining in Shaling gold mine,according to drilling and testing data in the exploration area,basing on the analysis of formation lithology and geological structure characteristics of the mining area to establish the geological model of Shaling gold mine.From studying of hydrogeological conditions,such as groundwater recharge, runoff, drainage and aquifer characteristics in the study area and mining area to generalize the aquifers in mining area.Combining with water filling factors to establish the conceptual model of hydrology geology and select the appropriate mathematical model,and next,by using MODFLOW module in GMS software to establish the three-dimensional finite element model to predict the water discharge. At the same time, forecast the mining water discharge by the Hydrogeological analogy method and the large diameter well method.Three methods are used to predict the mining water inflow can avoid the limitation of the single method It provides a reliable basis for the following mining work.In this study, the formation is generalized into six layers. Aquifer is generalized into four layers, they are The Quaternary pore aquifer,The bedrock weathering zone aquifer,The upper part weak rich water aquifer and The lower part weak rich water aquifer. The main ore bodies are also distributed in the lower part weak rich water aquifer. The groundwater of this aquifer is the direct water filling source of the deposit. Numerical simulations are also presented to predict the water inflow in the aquifer. The results of the study indicate that: The ability of separating water from the middle layer and the bottom plate is strong. This causes the lower part weak rich water aquifer to be under pressure. Therefore, the aquifer is regarded as a confined aquifer with infinite boundary of horizontal distribution. According to the model calculation, the mine discharge at the mining period is 8832m~3/d and the maximum mine discharge is 12326m~3/d. The water discharge predicted bylarge diameter well method in the-1400 m and-1700 m depths were 8467m~3/d and 11747m~3/d and predicted byHydrogeological analogy method in the-1400 m and-1700 m depths were 7383.84m~3/d and 8081.55m~3/d,at flood season, the maximum mine discharge is 9303.64m~3/d and 10182.75m~3/d The results obtained by the three methods are similar. In order to ensure the safety and efficiency of the gold mining, suggest selecting the maximum water discharge as the basis for the design of mine drainage, at the same time, supplementing hydrogeological work to master the real change of geological and hydrogeological conditions in the mining area...