顶板巷水力割缝钻孔间耦合关系数值模拟研究

Numerical simulation of coupling relationship between hydraulic cutting holes in roof roadway

为了确定顶板割缝后有效抽采半径,尽可能减少施工量,采用COMSOL数值模拟软件,研究了顶板巷水力割缝钻孔间相互耦合关系以及钻孔有效影响半径。从消突方面分析,由于钻孔之间相对位置较近,钻孔之间相互耦合作用较大,不同角度钻孔相互耦合作用下,在中间区域形成了椭圆状消突区域;钻孔间具有强烈的耦合效应,与单一钻孔相比,其影响半径提高了2.3倍;割缝钻孔的有效影响半径为7 m,能够满足抽采效果。该研究为实际工程设计提供了技术支持。

In order to determine the effective extraction radius after the roof slotting and reduce the amount of construction as much as possible,the COMSOL numerical simulation software was used to study the mutual coupling relationship between the drilling holes in the hydraulic cutting seam and the effective influence radius of the drill hole.From the analysis of the outburst,because of the relatively close relative position between the boreholes and the greater coupling between the holes,the elliptical outburst area was formed in the middle area under the interaction of different angles,and the borehole had a strong coupling effect.Compared with the single drill,the influence radius was increased by 2.3 times.The effective radius of the slotted hole was 7 m,which could satisfy the effect of extraction.The researchs provide technical support for practical engineering design.