走向高抽巷配合倾向钻孔抽采上邻近层卸压瓦斯技术
发布时间：2018-10-22 08:53
【摘要】：高瓦斯煤层群工作面开采时,由于采动的影响使得上邻近层含瓦斯煤层瓦斯解吸并涌入工作面,导致工作面瓦斯超限,所以上邻近层卸压瓦斯抽采越来越受到重视。阳泉五矿15#煤层8210工作面开采过程中,覆岩内采动卸压瓦斯涌出量占工作面瓦斯涌出量的90%,针对单独使用一条走向高抽巷抽采不能解决工作面瓦斯超限的问题,提出使用走向高抽巷配合倾向钻孔抽采覆岩上邻近层卸压瓦斯,即使用本工作面高抽巷抽采回风侧裂隙带瓦斯的同时,利用相邻备用工作面高抽巷布置倾向钻孔,终孔位于采煤工作面进风巷内侧顶板裂隙带内,抽采进风侧裂隙带内的卸压瓦斯,从而增加覆岩裂隙卸压瓦斯抽采范围。基于8210工作面覆岩岩层地质状况及含瓦斯煤岩层分布,结合理论研究、数值模拟等方法研究了工作面开采后覆岩岩层应力重新分布、覆岩裂隙分布、卸压瓦斯流动、卸压瓦斯抽采方法及抽采效果,为覆岩裂隙带卸压瓦斯抽采提供重要参考,具体研究内容如下:(1)研究工作面开采后,覆岩内采动裂隙分布,从而确定覆岩内卸压瓦斯富集区域,为走向高抽巷及倾向钻孔布置提供依据。首先使用FLAC3D模拟软件建立8210工作面开采模型,通过分析工作面开挖后的上覆岩层塑性变形、运动位移变化、应力重新分布变化,最终得出工作面开采后覆岩内部裂隙场分布及卸压瓦斯运移通道位置。分析模拟结果可知:顶板上方40m以内主要发生拉破坏,50-70m以内主要发生剪破坏;距离工作面顶板50m以上覆岩内部应力下降梯度已经明显减小,且下沉位移量突然锐减,顶板70m以上覆岩应力卸压值小于20%,下沉位移量量接近0;水平方向距离进回风巷25-35m范围内覆岩水平位移差值最大,水平应力变化量也最大,表明此区域处于纵向裂隙发育区。因此,综合分析得出裂隙瓦斯富集通道垂直距离煤层顶板50-70m,水平距离巷道25-35m。(2)根据工作面开挖模拟覆岩裂隙分布结果,建立覆岩裂隙卸压瓦斯抽采模型,模拟走向高抽巷及倾向钻孔抽采覆岩卸压瓦斯抽采效果和抽采范围。首先利用COMSOL软件建立8210工作面覆岩卸压瓦斯抽采模型,并根据覆岩内部裂隙分布及瓦斯涌出源项设置模型的孔隙率渗透率及各源项卸压瓦斯通量,对比分析抽放前后覆岩内瓦斯压力云图可得:抽采40天后,走向高抽巷一侧,竖直方向上瓦斯裂隙通道内瓦斯压力由原始的2MPa降至0.6Mpa,水平方向26m以内瓦斯压力降至0.74MPa;单个倾向钻孔周边7.5m处瓦斯压力由2MPa降至0.74MPa,根据钻孔有效抽采半径定义得知钻孔的有效抽放半径为7.5m。(3)根据模拟覆岩卸压瓦斯抽采效果及抽采范围,设计8210工作面覆岩布置走向高抽巷及倾向钻孔布置参数。走向高抽巷设置在覆岩裂隙带下部,垂向距离采空区顶板55m位置处,水平方向距回风巷30m;倾向钻孔钻场设置在布置在相邻备采工作面高抽巷内,每隔30m布置一个钻场,每个钻场布置9个钻孔,各钻孔孔口相距0.5m,终孔相距13m,钻孔长度为100m—120m。(4)结合模拟结果及8210工作面覆岩走向高抽巷配合倾向钻孔抽采布置设计参数,计算预测布置走向高抽巷及倾向钻孔后工作面瓦斯抽采效果,预测得知:走向高抽巷及倾向钻孔有效抽采范围内瓦斯含量由18.69m3/m3降至3.37m3/m3,降低82%;走向高抽巷单位时间瓦斯抽采量为40.78m3/min,倾向钻孔单位时间瓦斯抽采量为27.58m3/min,倾向钻孔瓦斯抽采能力为走向高抽巷的67.4%;根据工作面瓦斯涌出量,计算可知单独使用走向高抽巷抽采时,工作面瓦斯抽采率为47.8%,配合倾向钻孔后,工作面瓦斯抽采率由47.8%提升至79.7%,瓦斯抽采达标。
[Abstract]:In the mining of high gas coal seam group, due to the influence of mining movement, the gas in the upper adjacent layer contains gas to desorb and pour into the working face, resulting in gas exceeding in the working face, so the gas extraction of the upper adjacent layer is getting more and more attention. in the mining process of the 8210 working face of the 15 # coal seam of Yangquan Five Mine, the gas emission amount in the overlying rock accounts for 90% of the gas emission amount in the working face, the invention provides a method for discharging pressure gas by using an adjacent layer on an adjacent layer of a high-suction tunnel in the working face, and the final hole is positioned in the crack belt inside the top plate of the air inlet tunnel of the coal mining working face, and the pressure relief gas in the crack belt on the air inlet side is extracted, thereby increasing the gas extraction range of the rock discharge pressure of the overlying rock. Based on the geological conditions of rock-overlying strata in the 8210 working face and the distribution of gas-bearing strata, combined with theoretical research and numerical simulation, the redistribution of stress redistribution of rock-overlying strata, distribution of rock-overlying fracture, pressure relief gas flow, pressure relief gas extraction and extraction effect are studied. This paper provides an important reference for the gas extraction and extraction of rock-covered fracture zone. The specific research contents are as follows: (1) After the mining of the working face, the distribution of the fracture distribution in the overlying rock is studied, so as to determine the area of gas accumulation in the overlying rock, and provide the basis for moving towards the high suction lane and the inclined drilling arrangement. Firstly, a mining model of 8210 working face is established by FLAC3D simulation software. Through analyzing the plastic deformation, movement displacement and redistribution of the overlying strata after excavation of the working face, the distribution of the fracture field and the position of the pressure relief gas migration channel are finally obtained. According to the simulation results, the main occurrence of tensile failure within 40m above the top plate is mainly shear failure within 50-70m; the gradient of the internal stress of the overlying rock above the top plate 50m of the working surface is obviously reduced, and the sinking displacement suddenly decreases abruptly, and the stress relief value of the overlying rock above the top plate 70m is less than 20%. The displacement amount of subsidence is close to 0; the horizontal displacement difference is the largest in the range of 25-35m in the horizontal direction, and the variation of horizontal stress is also the largest, indicating that this area is in the longitudinal fissure development zone. Therefore, the comprehensive analysis shows that the vertical distance of the fissure gas enrichment channel is 50-70m and the horizontal distance is 25-35m. and (2) according to the distribution result of the rock-covered fracture of the working face, establishing a rock-clad fracture pressure-relief gas extraction model, and simulating the extraction effect and the extraction range of the gas extraction and the gas extraction for the high-pressure-pumping lane and the inclined borehole. First of all, using COMSOL software to build 8210 working face overburden pressure-relief gas extraction model, and according to the distribution of fracture distribution in the overlying rock and the gas emission source item, the porosity and gas flux of each source item are set, and the gas pressure cloud picture in the overlying rock before and after pumping is compared and analyzed. After 40 days of pumping, In the vertical direction, the gas pressure in the gas crack channel is reduced from 2MPa to 0.6Mpa, and the gas pressure in the horizontal direction 26m is reduced to 0. 74MPa, and the gas pressure at the periphery of the single inclined borehole is 7. 5m, and the gas pressure is reduced from 2MPa to 0.74MPa. According to the definition of effective extraction radius of borehole, it is known that the effective pumping radius of the borehole is 7.5m. (3) According to the effect of gas extraction and extraction and extraction range of the simulated overburden pressure relief, the design 8210 working face overburden is designed to move towards the high suction lane and the inclined borehole layout parameters. and the inclined drilling drilling field is arranged in the high suction lane arranged in the adjacent preparation working face, a drilling field is arranged every 30m, 9 drilling holes are arranged in each drilling field, Each drilling orifice is located at a distance of 0. 5m, the final hole is 13m, and the drilling length is 100m2/ 120m. (4) combining the simulation results and the design parameters of the 8210 working face overlying rock toward the high suction lane, calculating the gas extraction effect of the working face after the prediction is arranged towards the high suction lane and the inclined hole, and predicting that: The gas content in the effective pumping range from 18. 69m3/ m3 to 3.37m3/ m3 and the reduction of 82% in the effective pumping range of the high suction lane and the inclined borehole. The gas extraction capacity for the unit time of the high pumping lane is 40. 78m3/ min. The gas extraction capacity of the inclined drilling unit is 27,58m3/ min, and the drilling gas extraction capacity of the inclined drilling unit is 66.7% of the direction to the high suction lane. According to the gas emission amount in the working face, the gas extraction rate of the working face is 47. 8%, and the gas extraction rate of the working face is increased from 47. 8% to 77.9%, and the gas extraction is up to the standard.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712.6
本文编号：2286697
[Abstract]:In the mining of high gas coal seam group, due to the influence of mining movement, the gas in the upper adjacent layer contains gas to desorb and pour into the working face, resulting in gas exceeding in the working face, so the gas extraction of the upper adjacent layer is getting more and more attention. in the mining process of the 8210 working face of the 15 # coal seam of Yangquan Five Mine, the gas emission amount in the overlying rock accounts for 90% of the gas emission amount in the working face, the invention provides a method for discharging pressure gas by using an adjacent layer on an adjacent layer of a high-suction tunnel in the working face, and the final hole is positioned in the crack belt inside the top plate of the air inlet tunnel of the coal mining working face, and the pressure relief gas in the crack belt on the air inlet side is extracted, thereby increasing the gas extraction range of the rock discharge pressure of the overlying rock. Based on the geological conditions of rock-overlying strata in the 8210 working face and the distribution of gas-bearing strata, combined with theoretical research and numerical simulation, the redistribution of stress redistribution of rock-overlying strata, distribution of rock-overlying fracture, pressure relief gas flow, pressure relief gas extraction and extraction effect are studied. This paper provides an important reference for the gas extraction and extraction of rock-covered fracture zone. The specific research contents are as follows: (1) After the mining of the working face, the distribution of the fracture distribution in the overlying rock is studied, so as to determine the area of gas accumulation in the overlying rock, and provide the basis for moving towards the high suction lane and the inclined drilling arrangement. Firstly, a mining model of 8210 working face is established by FLAC3D simulation software. Through analyzing the plastic deformation, movement displacement and redistribution of the overlying strata after excavation of the working face, the distribution of the fracture field and the position of the pressure relief gas migration channel are finally obtained. According to the simulation results, the main occurrence of tensile failure within 40m above the top plate is mainly shear failure within 50-70m; the gradient of the internal stress of the overlying rock above the top plate 50m of the working surface is obviously reduced, and the sinking displacement suddenly decreases abruptly, and the stress relief value of the overlying rock above the top plate 70m is less than 20%. The displacement amount of subsidence is close to 0; the horizontal displacement difference is the largest in the range of 25-35m in the horizontal direction, and the variation of horizontal stress is also the largest, indicating that this area is in the longitudinal fissure development zone. Therefore, the comprehensive analysis shows that the vertical distance of the fissure gas enrichment channel is 50-70m and the horizontal distance is 25-35m. and (2) according to the distribution result of the rock-covered fracture of the working face, establishing a rock-clad fracture pressure-relief gas extraction model, and simulating the extraction effect and the extraction range of the gas extraction and the gas extraction for the high-pressure-pumping lane and the inclined borehole. First of all, using COMSOL software to build 8210 working face overburden pressure-relief gas extraction model, and according to the distribution of fracture distribution in the overlying rock and the gas emission source item, the porosity and gas flux of each source item are set, and the gas pressure cloud picture in the overlying rock before and after pumping is compared and analyzed. After 40 days of pumping, In the vertical direction, the gas pressure in the gas crack channel is reduced from 2MPa to 0.6Mpa, and the gas pressure in the horizontal direction 26m is reduced to 0. 74MPa, and the gas pressure at the periphery of the single inclined borehole is 7. 5m, and the gas pressure is reduced from 2MPa to 0.74MPa. According to the definition of effective extraction radius of borehole, it is known that the effective pumping radius of the borehole is 7.5m. (3) According to the effect of gas extraction and extraction and extraction range of the simulated overburden pressure relief, the design 8210 working face overburden is designed to move towards the high suction lane and the inclined borehole layout parameters. and the inclined drilling drilling field is arranged in the high suction lane arranged in the adjacent preparation working face, a drilling field is arranged every 30m, 9 drilling holes are arranged in each drilling field, Each drilling orifice is located at a distance of 0. 5m, the final hole is 13m, and the drilling length is 100m2/ 120m. (4) combining the simulation results and the design parameters of the 8210 working face overlying rock toward the high suction lane, calculating the gas extraction effect of the working face after the prediction is arranged towards the high suction lane and the inclined hole, and predicting that: The gas content in the effective pumping range from 18. 69m3/ m3 to 3.37m3/ m3 and the reduction of 82% in the effective pumping range of the high suction lane and the inclined borehole. The gas extraction capacity for the unit time of the high pumping lane is 40. 78m3/ min. The gas extraction capacity of the inclined drilling unit is 27,58m3/ min, and the drilling gas extraction capacity of the inclined drilling unit is 66.7% of the direction to the high suction lane. According to the gas emission amount in the working face, the gas extraction rate of the working face is 47. 8%, and the gas extraction rate of the working face is increased from 47. 8% to 77.9%, and the gas extraction is up to the standard.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712.6
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