Water inflow prediction of partially penetrating shafts with transient flow
Due to the big difference between the predicted and actual shaft water inflows by means of"large well method"during shaft development,we took Huanghaojie Coal Mine air-return shaft as an example to analyze the reason of the prediction errors.In terms of the actual hydrogeological condition of aquifers in Yan'an formation,we predicted the shaft water inflow based on the formula of confined water when the water flows to a partially penetrating well transiently.The prediction results show that the water inflow is big initially,which is 131.98 m3/h,and declines rapidly,approximately 61%in one day,to 51.66 m3/h.Then,water inflow decreases slowly,and tends to be stable.The prediction value is close to the actual drainage of air-return shaft in Huanghaojie Coal Mine.This method has been proved more accurate than"large well method".
partially penetrating welltransient flowwater inflow of shaftlarge well method
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