下保护层开采上覆煤岩位移传导效应特征研究
Characters Study on Displacement Conduction Effect in Overlying Coal and Rock During Lower Protective Seam Mining
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摘要: 为深入研究下保护层开采过程中上覆煤岩位移传导效应的时空演化机制，基于煤岩位移传导理论，从时间和空间角度分析了煤岩状态、地应力及渗透性在位移传导相对滞后和传导强度相对减弱影响下的变化过程，确定了被保护层瓦斯抽采的最佳布孔区域和最佳抽采时机。同时结合工程实践，在被保护层中选用煤岩位移传导效应的响应参数进行考察，结果表明：沿保护层工作面推进方向，被保护层瓦斯压力表现为上升-稳定-缓慢下降-快速下降-稳定-上升-稳定的变化过程，类似于马鞍状；被保护层瓦斯流量和煤层变形率均呈现稳定-下降-缓慢上升-快速上升-稳定-下降-稳定的变过程，类似于“S”型波动；下保护层开采有力促进被保护层应力释放和瓦斯运移。Abstract: In order to further study the displacement conduction effect about spatiotemporal evolution mechanism in overlying coal and rock during lower protective seam mining, the paper analyzed the changing process of coal and rock state, stress and permeability that were influenced by relatively backward displacement conduction and relatively weakened strength in the aspects of time and space, which based on theory of displacement conduction in overlying coal and rock. So, it confirmed the best regional hole arrangement and the best occasion for gas extraction in the protected coal seam. Combing with engineering practice at the same time, the response parameters for displacement conduction effect were used to investigate in the protected coal seam; the results showed that the gas pressure of protected coal seam changed in rising-stability-falling slowly-falling quickly-stability-rising-stability along the direction of lower protective seam mining, which was similar with shape of saddle. The gas flow and deformation rate of protected coal seam changed in stability-falling-rising slowly- rising quickly-stability-falling-stability along the direction of lower protective seam mining, which was similar with shape of "S". The lower protective seam mining was strong in stress relief and gas delivery in protected coal seam.
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[1] 王海峰,程远平,吴冬梅,等.近距离上保护层开采工作面瓦斯涌出及瓦斯抽采参数优化[J].煤炭学报,2010,35(4):590-594. [2] 王伟,程远平,袁亮,等.部近距离上保护层底板裂隙演化及卸压瓦斯抽采时效性[J].煤炭学报,2016,41(1):138-148. [3] 徐青云,杨明,乔元栋,等.丁集矿下保护层开采卸压保护范围研究[J].煤炭工程,2016,48(2):79-82. [4] 苏伟伟,李建兵,陈向军.小角度工作面快速揭开高突煤层技术[J].煤矿安全,2015,46(8):61-64. [5] 马国强,陈如忠,崔刚,等.近距离突出煤层群上保护层瓦斯综合治理技[J].煤炭科学技术,2015,43(3):52-55. [6] 季文博,齐庆新,李宏艳,等.近距离被保护卸压煤体透气性变化规律实测研究[J].煤炭学报,2015,40(4):830-835. [7] 涂敏,袁亮,缪协兴,等.保护层卸压开采煤层变形与增透效应研究[J].煤炭科学技术,2013,41(1):40. [8] 胡炳南.岩层移动理论在煤层气抽采技术中的应用研究[J].煤矿开采,2013,18(2):3-6. [9] 范刚伟，张东升，马立强.神东矿区浅埋深煤层开采覆岩移动与裂隙分布特征[J].中国矿业大学学报,2011,40(2):196-201. [10] 戴华阳,易四海,郭俊延,等.特厚急倾斜煤层水平分层开采地表预计方法[J].煤炭学报,2013,38(8):1305-1311. [11] 钱鸣高,许家林.覆岩采动裂隙分布的“O”形圈特征研究[J].煤炭学报,1998,23(5):466-469. [12] 许家林,钱鸣高,金宏伟.基于岩层移动的“煤与煤层气共采”技术研究[J].煤炭学报,2004,29(2):129. [13] 冯国瑞,任亚峰,王鲜霞,等.采空区上覆岩层开采层间岩层移动变形实验研究[J].采矿与安全工程学报,2011,28(3):430-435. [14] 康健,孙广义,董长吉.极近距离薄煤层同采工作面覆岩移动规律研究[J].采矿与安全工程学报,2010,27(1):51-56. [15] 胡国忠,王宏图,范晓刚,等.俯伪斜上保护层保护范围的瓦斯压力研究[J].中国矿业大学学报,2008,37(3):328-332. [16] 方昌才.保护层开采上覆煤岩变形移动及瓦斯抽采效果[J].安徽理工大学学报（自然科学版）,2012,32(2):35-40. [17] 傅雪海,李大华,秦勇,等.煤基质收缩对渗透率影响的实验研究[J].中国矿业大学学报,2002,31(2):129-131. [18] 尹光志,蒋长宝,王维忠,等.同卸围压速度对含瓦斯煤岩力学和瓦斯渗流特性影响试验研究[J].岩石力学与工程学报,2011,30(1):68-77.
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