【摘要】：隨著礦井開采強度的增加，煤層開采中須揭穿近距離多煤層的石門逐漸增多。與單一煤層石門揭煤相比，石門揭穿多個突出危險煤層時，煤層間的距離過小會引發(fā)相鄰煤層的突出危險，須制定針對所有煤層的區(qū)域防突措施，但目前常規(guī)防突技術(shù)無法有效的解決此問題。因此，開展近距離多煤層石門揭煤研究具有重要的理論價值和工程意義。 本文以雷公山煤礦1085運輸石門為研究對象，提出將高壓水射流割縫技術(shù)應(yīng)用于近距離多煤層石門揭煤的新思路，并采用理論分析與數(shù)值模擬相結(jié)合的方法確定現(xiàn)場割縫方案，最后在1085運輸石門進行現(xiàn)場試驗。主要研究成果如下： （1）揭示了高壓水射流割縫卸壓增透機理，即當(dāng)煤體被切割出縫槽后，煤體發(fā)生變形，縫槽周邊煤體發(fā)生損傷破壞，煤體原有裂隙擴張，煤體新的破壞裂隙形成，煤層透氣性提高；較遠(yuǎn)區(qū)域煤體因煤層卸壓，滲透率隨著應(yīng)力的降低而增大，煤層的透氣性得到提高。 （2）采用Comsol軟件數(shù)值研究了僅5#煤層割縫、僅9#煤層割縫、5#和9#煤層同時割縫三種不同割縫工況下的卸壓效應(yīng)，研究結(jié)果表明，5#和9#煤層同時割縫后，5#煤層頂、底板銜接處垂向最大卸壓率分別為98.6%、92.1%，9#煤層頂、底板銜接處垂向最大卸壓率分別為106.5%、102.6%；而僅5#煤層割縫和僅9#煤層割縫兩種工況下的割縫煤層頂、底板垂向最大卸壓率能達(dá)到90%以上，而鄰近未割縫煤層頂、底板處垂向最大卸壓率均在20%以下。在考慮整體卸壓效果的情況下，，確定5#和9#煤層同時割縫為最優(yōu)工況。 （3）根據(jù)優(yōu)選的割縫方案對1085運輸石門進行區(qū)域消突，與采用密集鉆孔消突工藝的1085回風(fēng)石門相比，單孔抽采瓦斯?jié)舛忍岣?.8倍，單孔瓦斯流量提高13.5倍，鉆孔數(shù)量減少55.9%，K1max降低40%，，石門揭煤時間縮短41%。
[Abstract]:With the increase of mining intensity, the number of stone gates in coal seam mining needs to be exposed. Compared with the single coal seam, when Shimen exposed several outburst dangerous coal seams, the small distance between the coal seams will lead to the outburst danger of the adjacent coal seams. Therefore, it is necessary to formulate regional outburst prevention measures for all coal seams. But at present, conventional anti-outburst technology can not effectively solve this problem. Therefore, it is of great theoretical value and engineering significance to carry out the research on Shimen uncovering coal in short distance multi-seam. This paper takes 1085 Shimen of Leigongshan Coal Mine as the research object, and puts forward a new idea of applying high pressure water jet cutting technology to uncovering coal in close distance multiple coal seams, and adopts the method of combining theoretical analysis and numerical simulation to determine the spot seam cutting scheme. Finally, the site test was carried out in 1085 Shimen. The main research results are as follows: (1) the mechanism of pressure relief and antireflection by high pressure water jet cutting joint is revealed, that is, when the coal body is cut out of the slot, the coal body is deformed, the surrounding coal body is damaged and destroyed, and the original crack expands. The new fracture of coal body formed, the permeability of coal seam increased, and the permeability of coal body increased with the decrease of stress in the far area because of the pressure relief of coal seam. The permeability of coal seam has been improved. (2) using Comsol software, the pressure relief effect under three different cutting conditions of only seams, 9# seams and 9# seams are studied numerically. The results show that the top of seams is cut at the same time, the maximum rate of vertical pressure relief at the joint of floor and floor is 98.6 and 92.1 respectively, and the maximum vertical pressure relief rate at the joint of floor and floor is 106.5 and 102.6, respectively. However, the maximum vertical pressure relief rate of the floor can reach more than 90% under the two working conditions of only seams with seam cutting and seam cutting only in 9# coal seam, while the maximum vertical pressure relief rate of the adjacent uncut seam roof and floor is below 20%. Considering the overall pressure relief effect, it is determined that the joint cutting at the same time is the optimal condition. (3) according to the selected seam cutting scheme, the 1085 transportation Shimen area is eliminated from outburst. Compared with the 1085 return air gate with dense borehole outburst elimination technology, the gas concentration in single hole is increased by 7.8 times, the gas discharge in single hole is increased by 13.5 times, the number of boreholes is reduced by 55.9% and K1max is reduced by 40 times, and the coal uncovering time of Shimen is shortened by 41 times.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TD712.62

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