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巨厚坚硬顶板变形及垮落的动态演化特征研究

王宏伟 邓代新 姜耀东 石瑞明 杨国振 章啸海

王宏伟, 邓代新, 姜耀东, 石瑞明, 杨国振, 章啸海. 巨厚坚硬顶板变形及垮落的动态演化特征研究[J]. 矿业科学学报, 2021, 6(5): 548-557. doi: 10.19606/j.cnki.jmst.2021.05.004
引用本文: 王宏伟, 邓代新, 姜耀东, 石瑞明, 杨国振, 章啸海. 巨厚坚硬顶板变形及垮落的动态演化特征研究[J]. 矿业科学学报, 2021, 6(5): 548-557. doi: 10.19606/j.cnki.jmst.2021.05.004
Wang Hongwei, Deng Daixin, Jiang Yaodong, Shi Ruiming, Yang Guozhen, Zhang Xiaohai. Study on the dynamic evolution characteristics of deformation and collapse of the extra-thick hard roof[J]. Journal of Mining Science and Technology, 2021, 6(5): 548-557. doi: 10.19606/j.cnki.jmst.2021.05.004
Citation: Wang Hongwei, Deng Daixin, Jiang Yaodong, Shi Ruiming, Yang Guozhen, Zhang Xiaohai. Study on the dynamic evolution characteristics of deformation and collapse of the extra-thick hard roof[J]. Journal of Mining Science and Technology, 2021, 6(5): 548-557. doi: 10.19606/j.cnki.jmst.2021.05.004

巨厚坚硬顶板变形及垮落的动态演化特征研究

doi: 10.19606/j.cnki.jmst.2021.05.004
基金项目: 

国家自然科学基金 41872205

北京市自然科学基金 8202041

中国矿业大学(北京)“越崎青年学者” 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,主要从事岩石力学与采矿工程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

Study on the dynamic evolution characteristics of deformation and collapse of the extra-thick hard roof

  • 摘要: 义马煤田赋存一层巨厚坚硬岩层,是矿区诸多动力灾害的主要诱因。本文以义马煤田千秋矿21221工作面为工程背景,开展了顶板岩层冲击倾向性的实验测定,采用相似模拟和数值分析方法研究了工作面回采过程中巨厚坚硬顶板运动特征,分析了巨厚坚硬顶板垮落垂直位移动态演化规律,建立了采动应力分布与顶板运移的关系。研究结果表明:巨厚坚硬顶板破断过程可分为初始平静期、稳定运动期和整体垮落期三个阶段; 顶板垂直位移量在初始平静期变化小,稳定运动期基本集中在采空区,向上呈现梯形递减趋势,整体垮落期则急剧向上发展。巨厚坚硬顶板运动呈现离层、瞬间下沉、离层闭合、间歇性稳定、瞬间垮落压实的非稳定动态变化现象。在工作面回采过程中,巨厚坚硬岩层变形和运动对采场施加了持续且不稳定的下沉压力,其结构失稳导致采场矿压发生强突变和采动应力突降,是冲击地压发生的重要诱因。
  • 图  1  千秋矿21221工作面地质柱状图

    Figure  1.  Geological profile of mining face 21221 of Qianqiu Mine

    图  2  岩层抗拉强度测定实验

    Figure  2.  The experiment of rock stratum tensile strength

    图  3  巨厚坚硬顶板赋存的相似实验模型

    注:1—11为应力监测点

    Figure  3.  Similar experiment model under the existence of extra-thick hard roof

    图  4  相似模型中顶板运动状态

    Figure  4.  Movement state of the roof in similar experiment model

    图  5  顶板垂直位移变化

    Figure  5.  Vertical displacement variation of the roof

    图  6  巨厚坚硬砾岩中监测点应力变化曲线

    Figure  6.  Stress variation of the monitoring points in the extra-thick hard conglomerate strata

    图  7  巨厚坚硬砾岩应力变化量

    Figure  7.  Stress variation of the extra-thick hard conglomerate strata

    图  8  巨厚坚硬顶板数值模型

    Figure  8.  Numerical model of the extra-thick hard roof

    图  9  顶板塑性区分布状态

    Figure  9.  Distribution of the plastic zone of the roof

    图  10  泥岩垂直应力变化

    Figure  10.  The change of the vertical stress in the mudstone

    图  11  巨厚坚硬砾岩垂直应力变化率

    Figure  11.  The vertical stress change rate of extra-thick and hard conglomerate strata

    表  1  顶板泥岩物理力学参数

    Table  1.   Physical-mechanics parameters of roof mudstone

    试件编号 抗压强度/MPa 抗拉强度/MPa 覆岩荷载/MPa 密度/(kg·m-3) 弹性模量/GPa
    1 40.79 10.69 18.62 2 545.16 6.31
    2 39.06 11.32 18.62 2 550.19 6.17
    3 35.35 11.54 18.62 2 528.28 5.82
    下载: 导出CSV

    表  2  顶板岩层冲击倾向性分类及指数

    Table  2.   The classification and index of bursting liability of roof stratum

    类别 Ⅰ类 Ⅱ类 Ⅲ类
    冲击倾向性
    冲击能量指数/kJ ≤15 15~120 ≥120
    下载: 导出CSV

    表  3  千秋矿21221工作面岩层物理力学参数

    Table  3.   Physical-mechanics parameters of strata of mining face 21221of Qianqiu Mine

    岩性 密度/(kg·m-3) 抗压强度/MPa 弹性模量/GPa 泊松比 摩擦角/(°) 黏聚力/MPa
    砾岩 2 865 45 28.99 0.22 40.0 15.30
    砂质泥岩 2 670 31 15.76 0.20 29.5 3.50
    1-2煤层 1 480 23 3.85 0.16 27.5 2.47
    泥岩 2 461 25 8.86 0.26 30.6 2.76
    2煤层 1 440 22 3.34 0.16 26.9 2.40
    细砂岩 2 873 38 17.66 0.18 29.2 6.50
    下载: 导出CSV

    表  4  相似材料参数

    Table  4.   Parameters of similar materials

    模拟岩层 细砂、石膏、石灰配比号 相似材料抗压强度/MPa 模拟岩层抗压强度/MPa
    砾岩 655 0.28 44.8
    砂质泥岩 746 0.19 30.4
    泥岩 755 0.16 25.6
    煤层 764 0.14 22.4
    细砂岩 646 0.24 38.4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-11-04
  • 修回日期:  2020-12-21
  • 刊出日期:  2021-10-01

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