深埋矿井超大工作面顶板砂岩含水层涌水量预测方法

Prediction of Roof Sandstone Water Discharge at Super Large Working Face in Deep Mine

为预测深埋矿井超大工作面顶板砂岩含水层涌水量,改进了以大井法为基础的涌水量预测方法。利用放水试验确定含水层的疏降影响半径;观测、研究类似矿井工作面回采进尺与涌水量关系,确定模拟大井的引用半径;改变了传统以实际回采区域确定引用半径的方法。根据工作面疏放水钻孔的布置及干扰井群势的叠加理论,推导了干扰井群的疏降水量预测式。根据单个钻场放水孔涌水量降深关系、推导了5个钻场放水量及回采进尺300 m模拟大井的涌水量比拟法计算式,预测工作面正常和最大涌水量。

The water discharge prediction method base on the big well is improved in order to predict roof sandstone water discharge. Water discharge experiment is used to determine the influence radius of aquifer. The simulation well of the reference radius is deter- mined by observing and studying face footage in mines with similar conditions. Influence radius method referring to the actual mining area is improved. Water discharge formula of the referential well is deduced according to superposition of potential theory and discharge well layout. Water discharge analogy formula of five referential wells and 300 m footage working face is derived according to the relationship between aquifer drawdown and water discharge in a single well discharge experiment.