• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
近奥灰薄隔水层底板岩体变形破坏机制研究
  • Title

    Study on deformation and rock failure mechanism of floor rock mass with thin aquifuge near Ordovician limestone

  • 作者

    李见波 尹尚先

  • Author

    LI Jianbo,YIN Shangxian

  • 单位

    华北科技学院 安全工程学院华北科技学院河北省矿井灾害防治重点实验室

  • Organization
    School of Safety Engineering,North China Institute of Science & Technology;Hebei State Key Laboratory of Mine Disaster Prevention,North China Institute of Science and Technology
  • 摘要

    近奥灰承压含水层和薄隔水层条件给矿井的安全生产造成很大威胁,为研究奥灰影响下薄隔水层底板岩层变形破坏机制,基于岩层地质结构特征,构建了风化带影响下底板岩体变形破坏模型,进行理论分析并验证。以垂向底板岩层变形的差异性为基础,计算得到了特厚煤层开采时底板破坏区深度,分析了弹塑性条件下风化带上方完整岩层的扰动变形特征和基于I型应力强度因子的裂纹型岩层拉伸破坏机制。最后,基于井田构造和煤层赋存特征建立数值模型,模拟分析近奥灰承压含水层和薄隔水层条件下特厚煤层开采底板岩体的变形值和破坏规律。计算结果表明:岩层两端受压、中间受拉,形成类似薄板结构,岩层受到向上的垂向应力,加快了岩层的破坏;奥灰顶部风化带由于岩性较弱受扰动容易破坏,而且破坏区会向上发育;岩层破坏通过底板破坏区和风化带破坏区向中间不断发育贯通。特厚煤层开采时,破坏区能够贯穿风化岩层上方的整个底板岩层。监测点瞬态位移变化表明:监测点位移曲线垂向存在2个明显的拐点,将监测点位移曲线分为3段,分别对应着风化段上方岩层、风化段和奥灰层,奥灰风化带对底板岩层变形影响明显,需要采取相应加固措施。监测点全程位移曲线与瞬态变化曲线规律一致,数值计算结果与理论分析相符。

  • Abstract

    In order to study the deformation and failure mechanism of thin aquifuge floor rock under the influence of Ordovician limestone,the influence of weathering zone was constructed based on the geological structure characteristics of the rock. The deformation and failure model of the lower floor rock mass was theoretically analyzed and verified. Based on the difference in vertical floor rock deformation,the depth of floor failure zone during ultra-thick coal seam mining was calculated and the disturbance deformation characteristics of the intact strata above the weathering zone under the elastic-plastic conditions and the tensile failure mechanism of the of the rock formation based on the type I stress intensity factor were analyzed. Finally,based on the mine strata structure and coal seam characteristics,a numerical model was established to simulate and analyze the deformation value and failure law of the floor rock mass under the conditions of near Ordovician limestone confined aquifer and thin aquifuge. The results show that the two ends of the rock stratum are compressed and the middle is tensioned,forming a similar thin plate structure,and the rock stratum is subject to upward vertical stress,which accelerates the destruction of the rock layer. The top weathering zone of Ordovician limestone is easily damaged due to weak lithology and is easily damaged by disturbance,and the damage area will develop upward; the failure of the rock stratum will continue to develop through the floor damage area and the weathering zone damage area to the middle. When mining extra-thick coal seams,the failure zone can penetrate the entire floor rock above the weathered rock. The transient displacement change of monitoring points shows that there are two obvious inflection points in the vertical direction of the displacement curve of monitoring points. The displacement curve of monitoring points is divided into 3 sections,which correspond to the rock strata above the weathered section,the weathering section and the Ordovician limestone section respectively. The Ordovician limestone weathering zone has obvious influence on the deformation of the floor rock,so corresponding reinforcement measures need to be taken. The whole displacement curve of the monitoring point is consistent with the transient curve,and the numerical results are consistent with the theoretical analysis.

  • 关键词

    矿井突水裂纹扩展底板变形奥灰水隔水层破坏

  • KeyWords

    mine water inrush; crack propagation; floor deformation;Ordovician water; deformatron of aquifuge

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2017YFC0804108);中央高校基本科研业务费资助项目(3142018021,3142015082);国家自然科学基金资助项目(51504095)
  • 文章目录

    0 引言

    1 地质概况

    2 近奥灰薄隔水层底板岩体变形破坏特征与机制

       2.1 底板岩层变形破坏形态

       2.2 底板破坏区

       2.3 中间层变形与破坏机制

    3 近奥灰薄隔水层工作面开采数值模拟

       3.1 应力边界与参数

       3.2 模拟结果分析

    4 结论

  • 引用格式
    李见波,尹尚先.近奥灰薄隔水层底板岩体变形破坏机制研究[J].煤炭科学技术,2021,49(12):173-179.
    LI Jianbo,YIN Shangxian.Study on deformation and rock failure mechanism of floor rock mass with thin aquifuge near Ordovician limestone[J].Coal Science and Technology,2021,49(12):173-179.
  • 图表
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    • 矿井地层结构

    图(10) / 表(0)

相关问题

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