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采动作用下岩溶山体深大裂隙扩展贯通机理研究

杨忠平 蒋源文 李滨 高杨 刘新荣 赵亚龙

杨忠平, 蒋源文, 李滨, 等, 2020. 采动作用下岩溶山体深大裂隙扩展贯通机理研究. 地质力学学报, 26 (4): 459-470. DOI: 10.12090/j.issn.1006-6616.2020.26.04.039
引用本文: 杨忠平, 蒋源文, 李滨, 等, 2020. 采动作用下岩溶山体深大裂隙扩展贯通机理研究. 地质力学学报, 26 (4): 459-470. DOI: 10.12090/j.issn.1006-6616.2020.26.04.039
YANG Zhongping, JIANG Yuanwen, LI Bin, et al., 2020. Study on the mechanism of deep and large fracture propagation and transfixion in karst slope under the action of mining. Journal of Geomechanics, 26 (4): 459-470. DOI: 10.12090/j.issn.1006-6616.2020.26.04.039
Citation: YANG Zhongping, JIANG Yuanwen, LI Bin, et al., 2020. Study on the mechanism of deep and large fracture propagation and transfixion in karst slope under the action of mining. Journal of Geomechanics, 26 (4): 459-470. DOI: 10.12090/j.issn.1006-6616.2020.26.04.039

采动作用下岩溶山体深大裂隙扩展贯通机理研究

doi: 10.12090/j.issn.1006-6616.2020.26.04.039
基金项目: 

国家重点研发计划项目 2018YFC1504802

国家自然科学基金项目 41772306

中央高校基本科研业务费项目 2019CDXYTM0032

详细信息
  • 中图分类号: P642.25

Study on the mechanism of deep and large fracture propagation and transfixion in karst slope under the action of mining

  • 摘要: 岩溶坡体裂隙的扩展贯通是造成坡体失稳破坏的重要因素。为研究采动作用下高陡岩溶坡体随裂隙扩展贯通的失稳破坏机理,采用离散元(Universal Distinct Element Code,UDEC)数值模拟,研究了采动作用下坡体裂隙的发展规律。研究结果表明:采动作用对岩溶坡体的稳定性具有重要的影响作用,主要表现在煤层上覆岩体新生裂隙的发育以及诱发坡体原有裂隙的扩展;坡体内部裂隙的发育具有一定的时空效应,裂隙带高度随着采空区范围的增加而增加;坡体原有深大裂隙对坡体的破坏具有控制作用,坡体破坏时崩滑体沿着主控裂隙发生滑动;二维模型显示,含深大裂隙岩溶坡体在采动作用下形成类似"悬臂梁结构",悬臂梁结构沿着主控裂隙发生断裂,坡体中间软岩被挤出,最终主控裂隙与临空面扩展贯通,坡体发生崩塌破坏。

     

  • 图  1  贵州纳雍张家湾镇普洒村崩塌区地貌特征

    Figure  1.  Geomorphic characteristics of the collapse area in Pusa village, Zhangjiawan, Nayong, Guizhou Province

    图  2  贵州纳雍崩塌工程地质剖面图

    1—灰岩;2—泥灰岩;3—泥质粉砂岩;4—粉砂质泥岩;5—煤层;6—采空区;7—深大裂隙;8—断层;9—下三叠统夜郎组二段;10—下三叠统夜郎组一段;11—上二叠统长兴组+大隆组;12—上二叠统龙潭组

    Figure  2.  Engineering geological profile of the Nayong collapse in Guizhou Province

    图  3  山体岩溶管道

    Figure  3.  Schematic diagram of the karst slope pipeline

    图  4  崩塌体后缘岩溶裂隙

    Figure  4.  Schematic diagram of the karst fissure at the trailing edge of the collapse

    图  5  崩塌体后缘山顶岩溶塌陷坑

    Figure  5.  Karst collapse pit at the top of the trailing edge of the collapse

    图  6  崩塌后坡体壁面

    Figure  6.  Wall surface of the slope after the collapse

    图  7  崩塌后坡体后缘裂隙

    LD—拉陷槽;LX—拉裂缝

    Figure  7.  Schematic diagram of cracks at the trailing edge of the slope after the collapse

    图  8  岩体被节理切割形成块体

    Figure  8.  Blocks formed after being cut by joints

    图  9  普洒滑坡二维概化计算模型

    Figure  9.  Two-dimensional generalized calculation model of the Pusa landslide

    图  10  煤层开挖顺序图

    Figure  10.  Sequence diagram of the coal seam excavation

    图  11  普洒崩滑采空下竖向位移云图

    Figure  11.  Cloud chart of the vertical displacements under the goaf of the Pusa landslide

    图  12  坡表监测点水平和垂直位移曲线图(监测点位置见图 9)

    Figure  12.  Horizontal and vertical displacement curves of the monitoring points on the slope surface (Positions of the monitoring points are shown in Fig. 9

    图  13  M10-1工作面上覆岩层监测点水平和垂直位移曲线图(监测点位置见图 9)

    Figure  13.  Horizontal and vertical displacement curves of the overburden strata monitoring points on the working face M10-1 (Positions of the monitoring points are shown in Fig. 9)

    图  14  煤层上覆岩层垮落示意图

    Figure  14.  Schematic diagram of the overburden collapse in the coal seam

    图  15  煤层上覆岩体裂隙带高度时空演化图

    Figure  15.  Spatial and temporal evolution of the fracture zone height of the overburden rock mass in the coal seam

    图  16  坡体上部裂隙发育示意图

    Figure  16.  Sketch map of the fracture development in the upper part of the slope

    图  17  坡体变形破坏示意图

    Figure  17.  Diagram of the slope deformation and failure

    表  1  岩体物理力学参数表

    Table  1.   Physical and mechanical parameters of the rock mass

    岩性 密度/(kg·m-3) 体积模量/GPa 剪切模量/GPa 粘聚力/MPa 内摩擦角/(°) 抗拉强度/MPa
    灰岩 2700 31.28 17.53 8.16 45 2.90
    泥灰岩 2450 25.62 14.76 6.53 39 1.60
    泥质粉砂岩 2600 21.47 11.52 4.29 34 1.40
    粉砂质泥岩 2500 18.21 9.84 5.89 30 1.50
    煤层 1350 4.00 2.50 0.52 48 0.31
    下载: 导出CSV

    表  2  结构面物理力学参数表

    Table  2.   Physical and mechanical parameters of the structural surface

    结构面类型 法向刚度系数/GPa 切向刚度系数/GPa 粘聚力/MPa 内摩擦角/(°) 抗拉强度/MPa
    煤层交界面 2.6 2.7 0.7 14 0.12
    其他岩层交界面 28.0 28.0 1.3 24 0.16
    岩体节理 32.0 32.0 0.8 19 0.24
    断层 31.0 34.0 0.5 16 0.00
    下载: 导出CSV
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  • 收稿日期:  2020-05-26
  • 修回日期:  2020-06-24
  • 刊出日期:  2020-08-28

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