水力冲孔卸压增透技术研究

Research on hydraulic punching pressure-relief and permeability increasing technology

为了增加煤矿瓦斯抽采量,缩短瓦斯抽采时间,理论研究了水力冲孔破煤机理,对喷嘴进行了选型;采用FLAC 3D数值模拟软件,模拟分析了水力冲孔后煤体应力、位移分布及不同孔径下煤体应力和位移的关系,并进行了工业试验,采用水力冲孔技术后,瓦斯抽采效果明显。研究为有效防范煤与瓦斯突出提供了技术支持。

In order to increase the amount of coal mine gas drainage and shorten the time of gas drainage,this paper theoretically studied the mechanism of hydraulic punching coal,and selected the nozzle type;FLAC 3D numerical simulation software was also used to simulate.The distribution of coal stress and displacement after hydraulic punching and the relationship between coal stress and displacement under different apertures were analyzed,and industrial tests were carried out.After the use of hydraulic punching technology,the gas drainage effect is obvious.The research has provided technical support for effectively preventing coal and gas outbursts.