大淑村矿开采下保护层保护效果及范围研究

发布时间：2018-04-05 15:31

本文选题：开采下保护层　切入点：效果　出处：《辽宁工程技术大学》2013年硕士论文

【摘要】：煤矿瓦斯突出事故是矿瓦斯灾害的重点问题，突出危害之大使人们不得不去考虑和研究防突、消突的措施。保护层开采目前被认为是最经济、最有效的方法。本文研究了下保护层开采的保护效果和保护范围的划定。施工9个大钻场，和一个单独穿层钻孔，共计50个考察钻孔。分别研究压力变化、膨胀量、透气系数变化、钻孔瓦斯流量变化、瓦斯含量变化等，最终目的都是为了确定保护范围考察保护效果，为安全高效开采服务。保护层开采后在保护范围内，一般可使2#煤层原始瓦斯压力降低0.5MPa左右；可使其透气性系数平均增加777.1倍，倾斜上部最大增加了1552倍，下部最大增大了1135倍，透气性最好的区域一般在工作面前方12m和工作面后方68m这个80m的范围之内；煤层的最大膨胀率达到23.7‰工作面后方60m，，处出现了膨胀量最大区域；2#煤层原始原煤瓦斯含量为10.26m~3/t，4#煤层回采后，其残余原煤瓦斯含量降低为6.04m~3/t，平均下降了41.1%，从损失量、解吸量、残存量上比较，主要在损失量上降低，其相对下降了94.6%，解析量相对下降了1.3%，残存量相对下降19.1%;探明了4#煤层对2#煤层沿倾斜方向的上部卸压角δ2=90o，下部卸压角δ1=75°，沿走向方向对应于始采线、采止线、煤柱边缘位置卸压角δ3=65o，垂直方向上最大保护垂距S下=48m，不破坏2#煤层的最小层间距H=9.4m。指出倾斜方向上部最大卸压角取93.1o，下部最大卸压角取78.6o，走向的最大卸压角取67o。
[Abstract]:Coal mine gas outburst accident is the key problem of mine gas disaster, so people have to consider and study the measures to prevent outburst and eliminate outburst.Protection layer mining is currently considered to be the most economical and effective method.In this paper, the protection effect and protection range of the mining of the lower protective layer are studied.Construction of 9 large drilling sites, and a separate drilling layer, a total of 50 drill holes.The change of pressure, expansion, permeability, gas flow and gas content of borehole are studied respectively. The ultimate purpose is to determine the scope of protection, investigate the protection effect and serve for safe and efficient mining.After mining, the original gas pressure of coal seam can be reduced by about 0.5MPa, the permeability coefficient can be increased by 777.1 times on average, the maximum increase of inclined upper part is 1552 times, and that of lower part is 1135 times.The area with the best permeability is generally within the 80m range of 12m in front of the working face and 68m in the rear of the working face;Compared with the residual amount, it is mainly reduced in the amount of losses.Its relative decrease is 94.6m, the analytical quantity is decreased by 1.3and the residual amount is 19.10.It is proved that the pressure relief angle 未 _ (2990o) of the upper part of the coal seam and the angle 未 _ (1) (75 掳) of the lower part of the coal bed along the inclined direction of the coal seam in 2# coal seam are corresponding to the initial mining line and the mining line along the direction of the strike.The angle of relief pressure at the edge of coal pillar is 未 3 ~ (3) ~ (65) o, and the maximum vertical distance of protection in vertical direction is 48 m below S, without destroying the minimum seam spacing H ~ (9. 4) m of coal seam.It is pointed out that the maximum pressure relief angle is 93.1 ofor the upper part, 78.6 ofor the lower part, and 67 ofor the strike.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD713

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