本文選題：薄煤層 + 高位鉆孔��； 參考：《煤炭科學(xué)技術(shù)》2015年11期

【摘要】：為解決高瓦斯薄煤層回采工作面鄰近層及采空區(qū)瓦斯涌出難題,基于采空區(qū)上覆巖層移動(dòng)破壞的規(guī)律,在朱家店煤礦4號煤層頂板布置高位鉆孔的措施對卸壓瓦斯進(jìn)行抽采,并對高位鉆孔開孔位置、終孔位置、終孔高度、開孔距離等抽采參數(shù)進(jìn)行了研究。結(jié)合高位鉆孔抽采效果分析,得出4號煤層頂板裂縫帶高度在12 m左右、401工作面的初次來壓步距為20~30 m、工作面"O"形圈的周邊寬度為30 m左右、每組高位鉆孔開孔間距為8~12 m較為適宜�，F(xiàn)場應(yīng)用結(jié)果表明:通過向采空區(qū)裂縫帶內(nèi)施工參數(shù)設(shè)計(jì)合理的高位鉆孔,單孔抽采瓦斯純量在0.01~0.24 m3/min,上隅角瓦斯體積分?jǐn)?shù)由原來的0.89%降到0.31%左右,采煤工作面回風(fēng)瓦斯體積分?jǐn)?shù)由原來的0.65%降到0.20%左右,杜絕了采煤工作面回風(fēng)及上隅角瓦斯超限。
[Abstract]:In order to solve the problem of gas emission from adjacent strata and goaf in thin coal seam with high gas, based on the law of movement and destruction of overburden strata in goaf, the pressure relief gas is extracted from the roof of No. 4 coal seam in Zhujiadian Coal Mine. The extraction parameters such as the location of high hole, the height of final hole and the distance of hole are studied. Based on the analysis of the extraction effect of high level borehole, it is concluded that the initial pressure step distance of the roof crack zone of No. 4 coal seam is about 12 m or so, and the distance of initial pressure step is 20 ~ 30 m, and the circumference width of "O" ring is about 30 m. The opening distance of each group of high hole is 812 m. The field application results show that through the reasonable design of high hole drilling in the crack zone of goaf, the volume fraction of gas in the upper corner decreases from 0.89% to 0.31%, and the volume fraction of gas in the upper corner decreases from 0.89% to 0.31%. The volume fraction of gas in the return air of the coal mining face is reduced from 0.65% to about 0.20%, which eliminates the over-limit of the return air and the gas in the upper corner of the coal mining face.
【作者單位】： 煤炭科學(xué)技術(shù)研究院有限公司安全分院;煤炭資源高效開采與潔凈利用國家重點(diǎn)實(shí)驗(yàn)室(煤炭科學(xué)研究總院);北京市煤礦安全工程技術(shù)研究中心;北京科技大學(xué)土木與環(huán)境工程學(xué)院;
【基金】：國家科技重大專項(xiàng)資助項(xiàng)目(2011ZX05040-001-007)
【分類號】：TD712.6

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本文編號：1954530