摘要
煤层开采后,上覆岩层下沉过程中,上下层状岩层挠曲不同步而形成的离层空间即离层。离层空间中积存的地下水即为离层水。结合济宁二号煤矿离层水突出实例,阐述了离层水的形成条件、影响因素和离层静水压突水机理,提出了离层静水压突水的危险性判别方法和离层静水压突水的防治措施。离层静水压突水的突水机理,是离层静水压力大于离层下位隔水层的承受能力,导致离层水突出。离层积水能否突出,可借用底板突水危险性评价中底板突水系数公式判断。通过超前在工作面顺槽斜向上方积水离层施工疏水钻孔,人为破坏离层的封闭性,可有效避免离层大量积水,进而避免大量离层积水突然溃出的水害事故的发生。实践证明,离层静水压突水可以预测和防治。
The bed separation is a space that is formed after coal seam mining by the upper and lower layered rock deflection out of sync during sinking of the overlying rock.The groundwater that accumulated in the bed separation space is the water in bed separation.Through analyzing the water-inrush case in bed separation in the Jining II coal mine,the author elaborated factors and formation conditions of water in bed separation,and the mechanism of hydrostatic water-inrush in bed separation,meanwhile,is put forward with the risk identification methods and prevention-control measurements of hydrostatic water-inrush in bed separation.The mechanism of hydrostatic water-inrush in bed separation is that the confining bed below the bed separation cannot bear the hydrostatic pressure of bed separation and leads to water-inrush.The possibility of water-inrush can be evaluated with the water inrush coefficient formula.The accumulation of more and more groundwater in bed separation and the following accident of sudden water inrush can be avoided effectively through breaking the closeness of the bed separation,such as drilling a drainage hole along the mining face trough tilt up to the bed separation in advance.It is proven that the hydrostatic water-inrush in bed separation can be predicted,prevented and controled.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2013年第2期9-12,41,共5页
Hydrogeology & Engineering Geology
关键词
离层水
形成条件
离层静水压
突水危险性判别
突水防治
water in bed separation
formation conditions
hydrostatic of bed separation
risk identification of water inrush
prevention and control of water inrush
