底抽巷穿层钻孔封孔深度与布孔间距优化研究

发布时间：2018-03-15 11:14

本文选题：封孔深度　切入点：布孔间距　出处：《煤炭科学技术》2017年02期 　论文类型：期刊论文

【摘要】：为了研究抽采钻孔间距、封孔深度、抽采时间对抽采瓦斯浓度的影响,以沙曲矿高瓦斯突出煤层群为研究对象,基于钻场围岩破碎区及其应力集中区现场开展了不同封孔深度的瓦斯抽采对比试验,应用COMSOL数值软件分析了抽采时间及布孔间距对瓦斯抽采效果的影响,提出了合理的穿层钻孔封孔深度和布孔间距。结果表明:随封孔深度增加,瓦斯抽采浓度先逐渐增大后趋于稳定,且存在临界封孔深度;随抽采时间延长,相邻钻孔间瓦斯压力降低呈叠加效应,抽采一定时间后趋于稳定;确定了沙曲矿4号煤层穿层钻孔封孔深度及布孔间距均为10 m;实测得出单孔平均抽采流量随时间延长呈负指数衰减,一年抽采期后有效消除了抽采区域的突出危险性。
[Abstract]:In order to study the influence of borehole spacing, hole sealing depth and extraction time on the gas concentration, the high gas outburst coal seam group in Shaqu Mine was taken as the research object. Based on the field test of different sealing depth of gas drainage in the fractured zone of surrounding rock and its stress concentration area, the effects of extraction time and spacing of holes on the effect of gas extraction are analyzed by using COMSOL software. The reasonable hole sealing depth and the spacing between the holes are put forward. The results show that with the increase of the hole sealing depth, the gas extraction concentration increases gradually and then tends to be stable, and there is a critical hole sealing depth, and with the prolonging of the extraction time, the gas extraction concentration increases gradually and then becomes stable. The reduction of gas pressure between adjacent boreholes is superimposed and tends to be stable after a certain time of drainage. It is determined that the depth of hole sealing and the spacing of hole distribution in No. 4 seam of Shaqu Coal Mine are both 10 m, and the measured results show that the average extraction flow of single hole decreases exponentially with time, and the outburst danger of extraction area is effectively eliminated after one year of extraction period.
【作者单位】：煤炭科学技术研究院有限公司安全分院;煤炭资源高效开采和洁净利用国家重点实验室;北京市煤矿安全工程技术研究中心;
【基金】：国家自然科学基金资助项目(51604154) 国家科技重大专项资助项目(2016ZX05067-005-005)
【分类号】：TD712.6

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