龙滩煤矿预抽钻孔抽采半径与抽采时间关系考察研究

对有突出危险的煤层而言,有效抽采半径是指钻孔抽采一定时间后能消除突出危险的范围,这个范围以钻孔为中心的半径来表示,在一定抽采条件下,有效抽采半径由预抽瓦斯有效性指标和预抽时间决定。龙滩煤矿采用瓦斯含量测定法分别测定出了顺层预抽钻孔和穿层预抽钻孔的瓦斯有效抽采半径,为工作面瓦斯治灾提供了基础。

Investigation and Study on Relationship between Pre-pumping Radius and Pumping Time of Pre-pumping Borehole in Longtan Coal Mine

For coal seams with outburst risk, the effective extraction radius refers to the area where the outburst risk can be eliminated after a certain time of drilling and extraction. This area is expressed by the radius centered on the borehole, and under certain extraction conditions, the effective extraction radius is determined by the effectiveness index and the time of pre-extraction. In Longtan coal mine,the effective gas drainage radii of pre-drainage boreholes along seam and pre-drainage boreholes through seam are determined respectively by gas content measurement method, which provides a basis for gas disaster control in working face.