采场顶板离层水“静水压涌突水”机理及防治

Mechanism of "Hydrostatic Water-Inrush" and Countermeasures for Water Inrush in Roof Bed Separation of A Mining Face

分析了采场顶板离层水涌突水实例,在此基础上分析了离层水形成的基本条件,总结提出了离层水"静水压涌突水"的离层水涌突水类型,探讨了采场顶板离层水"静水压涌突水"的形成机理.采场顶板离层水"静水压涌突水"的主要诱导因素为离层水的静水压力,判别关键是确定采场顶板离层水的静水压力及其可突破的相对隔水层厚度.可通过破坏离层的"封闭性"、超前疏放离层补给水源及离层水3种途径来避免采场顶板离层水的形成及预防离层水涌突水的发生.实际应用了井下离层水导流孔和截流孔两种类型来疏放离层水,经实际应用检验了其可靠性.

We analyze the water-inrush case in roof bed separation of a mining face and the basic formation conditions of water in bed separation.In addition,we summarize the type of water-inrush in bed separation and discuss the mechanism of hydrostatic water-inrush formation in roof bed separation of a mining face.The main induction factor of ＂hydrostatic water-inrush＂ in roof bed separation of a coal mine is the hydrostatic pressure.The key point of discrimination for water-inrush is the determination of water in mine roof bed separation and the thickness of relative water-resisting layer.The formation of water in mine roof bed separation and the occurrence of water in bed separation can be avoided through the following three kinds of approaches： 1） destroying the closeness of bed separation;2） dewatering the recharge water source in bed separation before exploitation;and 3） dewatering recharge the water in bed separation before exploitation.The conducting borehole drilling and the closure borehole drilling are used for dewatering in bed separation.The reliability is verified in practical application.