厚煤层采动覆岩变形特征及瓦斯运移规律分析
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摘要
矿井瓦斯是在煤的变质和煤的生成过程中伴生的一种气体,是影响矿井安全开采的主要因素。采用理论分析和数值模拟相结合的方法,对厚煤层采动覆岩变形特征及瓦斯运移规律进行了研究,分析了厚煤层采动覆岩变形特征、瓦斯在裂隙带中的扩散计算方程以及不同高度时和不同走向区域时瓦斯压力和流场分布规律。研究得出:切眼裂隙区的瓦斯浓度高于压实区的瓦斯浓度,在空间上瓦斯浓度呈"回型"分布;瓦斯在边界离层裂隙带进行集聚,在竖直方向上瓦斯浓度呈"马鞍型"分布。研究为钻孔合理层位的选择提供了理论支持,确保了矿井的安全生产。
Mine gas is a kind of gas associated with coal deterioration and coal generation,and is the main factor that affects mine safety mining.The deformation characteristics and gas migration laws of mining overburden in thick coal seam were studied by means of theoretical analysis and numerical simulation,the deformation characteristics of mining overlying rock in thick coal seam,the diffusion calculation equations of gas in fracture zone and the distribution laws of gas pressure and flow field at different height and direction are analyzed.The results show that the gas concentration in the fissure area is higher than the gas concentration in the compaction area,and the gas concentration in space is "return type" distribution,gas accumulates in the boundary rift zone,and the gas concentration is "saddle type" in the vertical direction.The research provides theoretical support for the selection of reasonable level of drilling and ensures the safe production of mine.
Mine gas is a kind of gas associated with coal deterioration and coal generation,and is the main factor that affects mine safety mining.The deformation characteristics and gas migration laws of mining overburden in thick coal seam were studied by means of theoretical analysis and numerical simulation,the deformation characteristics of mining overlying rock in thick coal seam,the diffusion calculation equations of gas in fracture zone and the distribution laws of gas pressure and flow field at different height and direction are analyzed.The results show that the gas concentration in the fissure area is higher than the gas concentration in the compaction area,and the gas concentration in space is "return type" distribution,gas accumulates in the boundary rift zone,and the gas concentration is "saddle type" in the vertical direction.The research provides theoretical support for the selection of reasonable level of drilling and ensures the safe production of mine.
引文
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[3] 李伟.高瓦斯厚煤层覆岩裂隙演化与瓦斯运移规律及应用研究[D].西安:西安科技大学,2015.
[4] 孙力,杨科,闫书缘,等.近距离煤层群下行开采覆岩运移特征试验分析[J].地下空间与工程学报,2014,10(5):1158-1163.Sun Li,Yang Ke,Yan Shuyuan,et al.Experimental analysis on characteristics of overlying rock movement in downward mining of close coal seam group[J].Chinese Journal of Underground Space and Engineering,2014,10(5):1158-1163.
[5] 采动裂隙椭抛带中瓦斯运移规律及其应用分析[D].西安:西安科技大学,2004.
[6] 马博恒,葛玉祥,李森林.阳泉某棚户区场地地下采动覆岩变形规律分析[J].山西建筑,2013,39(30):57-59.Ma Boheng,Ge Yuxiang,Li Senlin.Analysis of deformation law of overburden strata in a squatter area of Yangquan[J].Shanxi Architecture,2013,39(30):57-59.
[7] 采动覆岩裂隙场演化及瓦斯运移规律研究[D].重庆:重庆大学,2012.
[8] 蒋金泉,王普,郑朋强,等.高位硬厚岩层下采动裂隙和支承应力演化特征及其对瓦斯运移的影响[J].采矿与安全工程学报,2017,34(4):624-631.Jiang Jinquan,Wang Pu,Zheng Pengqiang,et al.Evolution characteristics of mining fissures and supporting stresses under high hard thick rock and its influence on gas migration[J].Journal of Mining & Safety Engineering,2017,34(4):624-631.
[9] 三维采动应力条件下煤层覆岩及底板裂隙场演化规律与瓦斯运移特征研究[D].重庆:重庆大学,2015.
[10] 王少一,高岳,朱锐杰,等.厚煤层分层开采覆岩破坏与变形规律的试验研究[J].现代矿业,2009(1):60-62.Wang Shaoyi,Gao Yue,Zhu Yuejie,et al.Experimental study on failure and deformation of overlying strata in thick coal seam mining[J].Modern Mining,2009(1):60-62.