【摘要】：為積極應(yīng)對(duì)國(guó)家禁止“U+L”型通風(fēng)方式所帶來的工作面瓦斯治理困局,興無煤礦42207工作面進(jìn)行“U+L”型通風(fēng)方式改Y型通風(fēng)方式瓦斯抽采試驗(yàn)研究,工作面通風(fēng)方式改變后,其風(fēng)排瓦斯能力大幅度下降,為了防止瓦斯超限,需要加大工作面瓦斯抽采量。本文基于42207工作面上部存在隨采隨冒的極近距離上鄰近層4上煤層的實(shí)際情況,在42207工作面進(jìn)行極近距離上鄰近層瓦斯抽采試驗(yàn),探究行之有效的極近距離上鄰近層瓦斯抽采方法。本文借助COMSOL Multiphysics軟件模擬分析了礦井工作面分別開挖20m、40m、60m、80m、100m時(shí)其前方煤巖體應(yīng)力分布情況,且首次將模擬開挖高度定為工作面懫高和冒落帶高度之和,模擬結(jié)果表明:工作面前方煤巖體存在超前卸壓效應(yīng),且極近距離上鄰近層的超前卸壓帶寬度為15m。通過現(xiàn)場(chǎng)超前卸壓帶寬度測(cè)試實(shí)驗(yàn),驗(yàn)證了工作面前方煤巖體存在超前卸壓效應(yīng),所實(shí)測(cè)的超前卸壓帶寬度為18.26m,與模擬結(jié)果基本一致,驗(yàn)證了模擬的合理性,并分析了二者產(chǎn)生差異性的原因,為極近距離上鄰近層瓦斯抽采試驗(yàn)提供了理論支撐與現(xiàn)場(chǎng)依據(jù)。在42207工作面施工的定向水平長(zhǎng)鉆孔試驗(yàn)孔,可以在極近距離上鄰近層4上煤層冒落到工作面之前對(duì)其超前卸壓瓦斯進(jìn)行有效抽采,抽采效果表明:鉆孔平均抽采濃度分別為12%和36%,平均抽采純量分別為0.46m3/min和0.74 m3/min;最大瓦斯抽采濃度能達(dá)到了63.03%,最大單孔瓦斯抽采純量達(dá)到了1.86 m3/min,抽采效果顯著。根據(jù)試驗(yàn)結(jié)果,所施工的極近距離上鄰近層瓦斯抽采長(zhǎng)鉆孔可有效地抽采極近距離上鄰近層超前卸壓瓦斯,能在很大程度上解決工作面上隅角和回風(fēng)流瓦斯超限問題,減小通風(fēng)壓力,降低采空區(qū)瓦斯涌出,保障工作面安全生產(chǎn)。
[Abstract]:In order to deal with the gas control difficulties caused by the ban of "U L" type ventilation mode, the gas drainage test of "U L" type ventilation mode to Y type ventilation mode is carried out in Xingwu coal mine 42207 working face. After the ventilation mode is changed, the gas drainage capacity of the working face is greatly reduced. In order to prevent the gas from exceeding the limit, it is necessary to increase the amount of gas drainage in the working face. Based on the fact that the upper part of the 42207 working face has the upper coal seam of the upper adjacent layer 4 with the caving, the gas extraction test of the very close distance upper adjacent bed is carried out at 42207 face. To explore the effective method of gas extraction from the upper adjacent strata in very close distance. In this paper, the stress distribution of coal and rock mass in front of coal face is simulated and analyzed with the help of COMSOL Multiphysics software, and the simulated excavation height is determined as the sum of the height of the face and the height of the caving zone for the first time. The simulation results show that there is a pressure-relief effect in the coal and rock mass in front of the working face, and the width of the pressure-relief zone in the adjacent strata is 15m at very close distance. Based on the field test of the width of the pressure-relief zone, it is verified that there is a pressure-relief effect in the coal and rock mass in front of the working face. The measured width of the zone is 18.26 m, which is basically consistent with the result of simulation, which verifies the rationality of the simulation. The reasons for the difference between the two are analyzed, which provides theoretical support and field basis for the gas extraction test of the adjacent strata in very close distance. The directional and long horizontal borehole test hole constructed in 42207 working face can be used to extract the pressure-relief gas in advance before the coal seam on the top of the adjacent layer 4 falls into the working face at very close distance. The results show that the average extraction concentration of borehole is 12% and 36%, the average extraction scalar is 0.46m3/min and 0.74 m3 / min respectively, the maximum gas extraction concentration is 63.03 and the maximum single hole gas extraction is 1.86 m3 / min, and the extraction effect is remarkable. According to the test results, the long borehole of gas extraction in the very close distance and upper adjacent strata can be used effectively to extract the gas in advance from the very close distance of the upper adjacent strata, and to a great extent to solve the problem of the upper corner angle of the working face and the gas overrun problem of the return air flow. Reduce ventilation pressure, reduce gas emission from goaf and ensure safe production.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD712.6

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