發(fā)布時(shí)間：2018-02-28 11:44

  本文關(guān)鍵詞： 穿層鉆孔 預(yù)抽瓦斯 抽采半徑 區(qū)域消突　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：針對(duì)沙曲二礦南三采區(qū)煤層賦存的特點(diǎn)(高瓦斯、低透氣性、煤與瓦斯突出危險(xiǎn)性),且3#、4#煤層在南三采區(qū)東部煤層間距較小,設(shè)計(jì)3+4#部分地段合并開采,基本不具備開采保護(hù)層的條件,因此根據(jù)《防治煤與瓦斯突出規(guī)定》相關(guān)條例,決定在沙曲二礦南三采區(qū)應(yīng)用區(qū)域防突措施——預(yù)抽煤層瓦斯。南三采區(qū)3+4#煤層和5#煤層沒有鄰近巷道施工順層長(zhǎng)鉆孔的條件,且考慮采面下鄰近層卸壓抽采需要,因此南三采區(qū)需采用煤層底板穿層鉆孔抽采瓦斯的區(qū)域防突措施。論文介紹了底抽巷穿層鉆孔預(yù)抽煤層瓦斯的區(qū)域防突措施在沙曲二礦南三采區(qū)的工程實(shí)踐,并主要對(duì)該措施的防突效果和應(yīng)用效果進(jìn)行了考察。綜合鉆孔圍巖應(yīng)力分布、抽采瓦斯流量?jī)煞N理論計(jì)算方法與COMSOL數(shù)值模擬研究,結(jié)合抽采時(shí)間,確定沙曲二礦南三采區(qū)煤層瓦斯抽采有效半徑為2.5m;結(jié)合抽采時(shí)間,綜合鉆孔圍巖應(yīng)力分布、抽采瓦斯流量?jī)煞N理論計(jì)算方法得出的瓦斯抽采有效半徑、穿層鉆孔抽采瓦斯鉆孔間距的理論計(jì)算與COMSOL數(shù)值模擬研究,確定抽采瓦斯鉆孔合理間距為5.0m,此時(shí)鉆孔連線中點(diǎn)處煤層瓦斯壓力降低至0.58MPa,小于0.74MPa。通過現(xiàn)場(chǎng)測(cè)試殘余瓦斯含量和理論計(jì)算殘余瓦斯壓力相結(jié)合的方法進(jìn)行區(qū)域預(yù)抽效果檢驗(yàn),結(jié)果表明煤層的原始瓦斯含量下降了56.7%,原始瓦斯壓力下降了61%,兩者都已達(dá)標(biāo)。通過測(cè)定鉆屑瓦斯解吸指標(biāo)K1和鉆屑量S值,進(jìn)行區(qū)域消突效果驗(yàn)證,兩者均達(dá)標(biāo),證明底抽巷穿層鉆孔預(yù)抽煤層瓦斯消突技術(shù)的有效性。
[Abstract]:In view of the characteristics of coal seam occurrence (high gas, low permeability, danger of coal and gas outburst, and the distance between coal seam and gas outburst in the eastern coal seam of No.3 mining area of Shaqu No. 2 Mine), the coal seam of No. 3 coal seam in Shaqu No. 2 Mine is combined with the design of three parts of coal mining area. Basically do not have the condition of mining protective layer, so according to the regulations on preventing Coal and Gas outburst, It is decided to apply regional anti-outburst measure, pre-drainage of coal seam gas, in No.3 mining area of Shaqu No.2 Mine. There is no condition of longwall drilling in adjacent roadway construction in the third mining area of South No.3 Mining area, and considering the need of pressure relief and extraction of adjacent strata under mining face, Therefore, the regional gas outburst prevention measures should be adopted in the third mining area of the south coal seam. The paper introduces the engineering practice of the regional gas prevention measures in the south third mining area of Shaqu No.2 Coal Mine, which is the pre-drainage of coal seam gas by drilling through the bottom roadway in Shaqu No. 2 Coal Mine. The paper mainly studies the anti-outburst effect and application effect of this measure, synthesizes the stress distribution of surrounding rock, two theoretical calculation methods of drainage gas flow and COMSOL numerical simulation, combined with extraction time, It is determined that the effective radius of coal seam gas drainage is 2.5 m in the south third mining area of Shaqu No. 2 Mine, and the effective radius of gas extraction is obtained by combining the extraction time, the stress distribution of surrounding rock of borehole and the two theoretical calculation methods of gas drainage flow. Theoretical calculation and COMSOL numerical Simulation of the interval between Gas drainage boreholes in perforating Stratum, It is determined that the reasonable spacing of gas drainage boreholes is 5.0 m.The gas pressure in coal seam at the middle point of the borehole line is reduced to 0.58 MPA and less than 0.74 MPA. The regional pre-drainage effect is tested by combining the field test of residual gas content with the theoretical calculation of residual gas pressure. The results show that the original gas content of coal seam has decreased by 56.7%, the original gas pressure has decreased by 61%, and both of them have reached the standard. By measuring the desorption index K1 of drilling debris gas and S value of drilling debris quantity, the regional anti-outburst effect is verified, and both of them reach the standard. It is proved that the technology of gas outburst suppression in coal seam is effective.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD713.3
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本文編號(hào)：1547177