矸石充填采煤工作面覆岩破裂特征及演化规律分析
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摘要
为研究充填开采条件下覆岩破坏变形规律,通过现场监测的方法,在某矿F5001充填工作面不同位置布置覆岩观测钻孔,借助钻孔成像判定覆岩破坏情况,分析了充填开采覆岩破裂特征和运动演化过程。结果表明:覆岩进入离层扩展阶段后具有裂隙向破裂带,破裂带向离层转化的趋势,最快24 h内可出现3处新生破裂带;离层一般出现在不同岩性的岩层分界处,裂隙多出现在较厚岩层内部;T_3150泄水巷上方覆岩共出现3处离层、8处明显破裂带,裂隙数目较多,顶板上方最大破裂高度约14.2 m,最大离层高度约11.3 m。
To study the failure and deformation laws of overlying strata under filling and mining conditions, this paper uses the on-site monitoring method to arrange the overburden observation drillings at different locations of the F5001 filling working face of a mine, and to determine the overburden damage by drilling imaging, and analyze the filling and mining rock rupture characteristics and motion evolution process. The results show that the overburden has a tendency to transform into a rupture zone and a rupture zone to the separation layer after entering the transitional stage of the separation layer. Three new rupture zones can occur within the first 24 hours; the separation layer generally appears at the boundary of different lithology. The cracks often appear in the thicker rock layers; there are 3 separated layers and 8 obvious rupture zones in the overlying rock above the T_3150 drainage roadway. The number of cracks is more, the maximum rupture height above the roof is about 14.2 m, and the maximum separation height is about 11.3 m.
To study the failure and deformation laws of overlying strata under filling and mining conditions, this paper uses the on-site monitoring method to arrange the overburden observation drillings at different locations of the F5001 filling working face of a mine, and to determine the overburden damage by drilling imaging, and analyze the filling and mining rock rupture characteristics and motion evolution process. The results show that the overburden has a tendency to transform into a rupture zone and a rupture zone to the separation layer after entering the transitional stage of the separation layer. Three new rupture zones can occur within the first 24 hours; the separation layer generally appears at the boundary of different lithology. The cracks often appear in the thicker rock layers; there are 3 separated layers and 8 obvious rupture zones in the overlying rock above the T_3150 drainage roadway. The number of cracks is more, the maximum rupture height above the roof is about 14.2 m, and the maximum separation height is about 11.3 m.
引文
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[3]范超军,李胜,海龙,等.矸石-粉煤灰充填采煤覆岩结构与变形规律[J].地下空间与工程学报,2018,14(1):117-123.
[4]江飞飞,李向东,万兵,等.盘区二步骤采场嗣后胶结充填对岩层移动影响分析[J].矿业研究与开发,2016,36(10):94-98.
[5]许凯.固体充填综采地表沉陷规律研究[J].煤矿安全,2013,44(4):55-57.
[6]宋高峰,刘会臣,任志成.“三下”压煤充填采煤技术发展现状及展望[J].煤矿安全,2014,45(10):191-193.
[7]刘康,轩大洋.长壁全部充填与条带充填开采沉陷控制效果对比[J].煤矿安全,2013,44(11):60-63.
[8]来兴平,王春龙,单鹏飞,等.采动覆岩破坏演化特征模型实验与分析[J].西安科技大学学报,2016,36(2):151-156.
[9]王家臣,杨胜利,杨宝贵,等.长壁矸石充填开采上覆岩层移动特征模拟实验[J].煤炭学报,2012,37(8):1256-1262.
[10]常庆粮,周华强,柏建彪,等.膏体充填开采覆岩稳定性研究与实践[J].采矿与安全工程学报,2011,28(2):279-282.
[11]缪协兴,黄艳利,巨峰,等.密实充填采煤的岩层移动理论研究[J].中国矿业大学学报,2012,41(6):863.
[12]赵同彬,张洪海,陈云娟,等.支承压力分布演化规律及对煤岩体破坏的影响[J].辽宁工程技术大学学报(自然科学版),2010,29(3):420-423.
[13]和树栋,赵同彬,耿清友.反程序开采底板岩层破裂区分布的探测研究[J].金属矿山,2012,41(12):99.
[14]刘晓明,赵同彬,王明强,等.固体充填工作面支架工作特性及顶板控制分析[J].山东科技大学学报(自然科学版),2017,36(2):42-47.
[15]杨宝贵,杨捷,王玉凯,等.充填开采上覆岩层移动变形研究[J].西安科技大学学报,2015,35(6):732.