不同倾角底板穿层钻孔瓦斯抽采流量衰减规律研究

Study on attenuation law of gas drainage flow in borehole passed through seam with different inclined floor

为了研究钻孔倾角对瓦斯抽采流量演化规律的影响,采用现场试验的方法,根据平煤十二矿底板穿层钻孔布置情况,研究了17种不同倾角下抽采钻孔周围的残余瓦斯压力分布情况,并现场实测了瓦斯抽采流量。研究发现,钻孔抽采流量呈3种演化规律,即负指数衰减、正指数衰减及先增大后呈负指数衰减;此外,靠近两侧倾角较大的钻孔的瓦斯抽采流量较高,而且标高较低的掩护掘进穿层钻孔的瓦斯抽采流量要高于治理下部穿层钻孔的瓦斯抽采纯量。

In order to study the borehole inclination affected to the evolution law of the gas drainage flow,according to the borehole layout passed through the seam along the floor in Pingmei No. 12 Mine,a site test method was applied to study the residual gas pressure distribution conditions around the gas drainage boreholes under 17 different inclinations and the gas drainage flow was measured at the site. The study showed that there were three evolution laws occurred in the gas drainage flow of the boreholes,which was negative index attenuation,positive index attenuation and negative index attenuation with increasing first and then decreasing. In addition,the gas drainage flow of the boreholes near two high inclination was high and the gas flow of the boreholes passed through the driving seam with a low elevation was higher than the gas drainage pure volume from the boreholes passed through underneath strata.