基于不完整井非稳定运动的立井井筒涌水量预测研究

Water inflow prediction of partially penetrating shafts with transient flow

针对立井掘进期间采用“大井法”预测井筒涌水量与实际情况相差较大的问题,以黄蒿界煤矿回风立井为研究对象,分析了勘探时期“大井法”井筒涌水量预测结果产生偏差的原因,结合延安组含水层实际水文地质条件,选取与其相适应的地下水向承压水不完整井非稳定运动的公式对立井涌水量进行了预测,预测结果表明,初期井筒涌水量较大,为131.98 m^(3)/h,但衰减较快,1 d内可衰减61%,至51.66 m^(3)/h,之后涌水量衰减较慢,趋于稳定,井筒涌水量预测结果与黄蒿界煤矿实际井筒疏降水量较为接近,说明该方法预测精度相比“大井法”更高。

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 m^(3)/h,and declines rapidly,approximately 61%in one day,to 51.66 m^(3)/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”.