基于实测的下保护层开采瓦斯压力与含量变化规律研究

发布时间：2018-04-07 18:16

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

【摘要】：本文针对煤与瓦斯突出危险的薛村矿具有下保护层开采条件,在下保护层开采过程中,通过测定分析研究了下保护层开采的保护效果,瓦斯压力变化、膨胀量、透气系数变化、钻孔瓦斯流量变化、瓦斯含量变化等,研究了被保护层的消突效果和保护开采的效果,为安全高效开采服务。 研究发现被保护层原始煤层瓦斯压力最大的可以达到1.6MPa,平均原煤瓦斯压力是1.16MPa。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,瓦斯压力最后稳定值大于0.74MPa的下降率平均为28.3%,瓦斯压力最后稳定值小于0.74MPa的下降率平均为57%。保护开采可使被保护层透气性系数平均增加777.1倍,倾斜方向最大增加了1552倍至至1135倍；煤层的最大膨胀率达到23.7‰；2#煤层原始原煤瓦斯含量平均下降了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%。计算出在保护范围之内,被保护层煤层变成了易抽放煤层。 通过开采过程中和开采停止后瓦斯压力的研究证明瓦斯卸压不可逆的过程,也说明保护开采的作用效果是不可逆的。找出了瓦斯流量与时间、膨胀量与透气性的负指数关系式。
[Abstract]:In this paper, in view of the coal and gas outburst dangerous Xucun mining conditions, in the process of mining under the protective layer, through the determination and analysis of the protective effect of the lower protective layer mining, gas pressure changes, expansion volume, gas permeability coefficient change,The change of gas flow rate and gas content of borehole is studied in this paper. The outburst suppression effect of protected layer and the effect of protecting mining are studied in order to serve the safety and efficiency of mining.It is found that the maximum gas pressure of the original coal seam under protection layer can reach 1.6 MPA, and the average gas pressure of raw coal is 1.16 MPA.In the protected area after mining, the original gas pressure of coal seam can be reduced by 0.5MPa or so. The final stable value of gas pressure is more than that of 0.74MPa, and the average rate of decrease of gas pressure is 28.3. the final stable value of gas pressure is less than that of 0.74MPa, and the average reduction rate is 57.Protection mining can increase the gas permeability coefficient of protected layer by an average of 777.1 times, increase the maximum inclined direction by 1552 times to 1135 times, and the maximum expansion rate of coal seam can reach 23.7 鈥，

本文编号：1720314