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分层开采时断层滑动位移演化特征研究

王宏伟 王刚 石瑞明 章啸海

王宏伟, 王刚, 石瑞明, 章啸海. 分层开采时断层滑动位移演化特征研究[J]. 矿业科学学报, 2021, 6(6): 688-695. doi: 10.19606/j.cnki.jmst.2021.06.007
引用本文: 王宏伟, 王刚, 石瑞明, 章啸海. 分层开采时断层滑动位移演化特征研究[J]. 矿业科学学报, 2021, 6(6): 688-695. doi: 10.19606/j.cnki.jmst.2021.06.007
Wang Hongwei, Wang Gang, Shi Ruiming, Zhang Xiaohai. Research on evolution characteristics of fault sliding displacement in slicing mining[J]. Journal of Mining Science and Technology, 2021, 6(6): 688-695. doi: 10.19606/j.cnki.jmst.2021.06.007
Citation: Wang Hongwei, Wang Gang, Shi Ruiming, Zhang Xiaohai. Research on evolution characteristics of fault sliding displacement in slicing mining[J]. Journal of Mining Science and Technology, 2021, 6(6): 688-695. doi: 10.19606/j.cnki.jmst.2021.06.007

分层开采时断层滑动位移演化特征研究

doi: 10.19606/j.cnki.jmst.2021.06.007
基金项目: 

北京市自然科学基金 8202041

国家自然科学基金 41872205

中国矿业大学(北京)"越崎青年学者"项目 2018QN13

详细信息
    作者简介:

    王宏伟(1981—),男,山西朔州人,教授,博士生导师,主要从事工程力学和采矿工程等方面的教学与研究工作。Tel:010-62331261,E-mail:whw@cumtb.edu.cn

  • 中图分类号: TD324

Research on evolution characteristics of fault sliding displacement in slicing mining

  • 摘要: 本文结合义马煤田地质构造,以千秋矿21221工作面为工程背景,进行了采动影响下断层滑移失稳相似模拟实验研究,探究了煤层分层开采扰动对断层滑移失稳的影响特征规律。结果表明,煤层上分层开采时顶板已发生较大程度的松动及离层现象,下分层开采时,顶板岩层进一步发生垮落现象,下分层开采扰动引发上覆岩体垮落范围更大,使断层周围位移变化更强烈、上下盘错动更明显、煤岩体中积聚的应变能峰值更高;同时,断层滑移滞后于煤岩体中应变能的剧烈释放,应变能峰值"突降"现象可作为判断断层滑移失稳的前兆;煤层下分层开采较上分层开采时能量剧烈释放的时间更早,更易诱发冲击地压灾害的产生。
  • 图  1  义马矿区地质构造示意图

    Figure  1.  Schematic map of geological structures in the Yima mining area

    图  2  千秋煤矿矿山工程图及F16逆冲断层几何特征

    Figure  2.  Mine engineering map of Qianqiu coal mine and geometric characteristics of F16 fault

    图  3  模型岩层和监测点布置

    Figure  3.  Layout of model rock formations and monitoring points

    图  4  相似模型区域划分图

    Figure  4.  Similar model area division map

    图  5  上煤层开采时断层周围位移变化云图

    Figure  5.  Displacement cloud map around the fault during upper mining

    图  6  下煤层开采时断层周围位移变化云图

    Figure  6.  Displacement cloud maps around faults during lower coal layer mining

    图  7  上煤层工作面推进过程中顶板垮落变化

    Figure  7.  Roof collapse change during upper coal layer working face mining

    图  8  下煤层工作面推进过程中顶板垮落变化

    Figure  8.  Roof collapse change during under coal layer working face mining

    图  9  上分层开采时断层附近位移随工作面推进的变化规律

    Figure  9.  Variation of the displacement near the fault with the advancement of the working face during upper-slice mining

    图  10  下分层开采时断层附近位移随工作面推进的变化规律

    Figure  10.  Variation law of the displacement near the fault along with the advancement of the working face during the lower-slice mining

    图  11  分层开采过程中煤层顶板应变能密度变化规律

    Figure  11.  Variation law of strain energy density of coal roof during slicing mining

    表  1  相似模型顶底板岩层力学参数

    Table  1.   Mechanical parameters of similar model roof and floor rocks

    类别 岩性 厚度/m 容重/(kN·m-3) 抗压强度/MPa
    基本顶 砾岩 1.24 40.3 0.56
    直接顶 泥岩 0.2 32.39 0.37
    煤层 2号煤 0.08 21.49 0.2
    基本底 粉砂岩 0.08 38.81 0.37
    下载: 导出CSV

    表  2  F16断层力学参数

    Table  2.   Mechanical parameters of F16 fault

    断层属性 走向/(°) 倾向 平均倾角/(°) 平均落差/m
    逆断层 110 南偏西 60 5
    下载: 导出CSV
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  • 收稿日期:  2020-12-14
  • 修回日期:  2021-01-14
  • 刊出日期:  2021-12-01

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