定向断裂控制爆破下层理页岩的致裂机理

杨国梁 毕京九 董智文 赵桐德 赵建宇 赵康朴

杨国梁, 毕京九, 董智文, 赵桐德, 赵建宇, 赵康朴. 定向断裂控制爆破下层理页岩的致裂机理[J]. 爆炸与冲击. doi: 10.11883/bzycj-2023-0336
引用本文: 杨国梁, 毕京九, 董智文, 赵桐德, 赵建宇, 赵康朴. 定向断裂控制爆破下层理页岩的致裂机理[J]. 爆炸与冲击. doi: 10.11883/bzycj-2023-0336
YANG Guoliang, BI Jingjiu, DONG Zhiwen, ZHAO Tongde, ZHAO Jianyu, ZHAO Kangpu. Fracturing mechanism of bedding shale under directional fracture-controlled blasting[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0336
Citation: YANG Guoliang, BI Jingjiu, DONG Zhiwen, ZHAO Tongde, ZHAO Jianyu, ZHAO Kangpu. Fracturing mechanism of bedding shale under directional fracture-controlled blasting[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0336

定向断裂控制爆破下层理页岩的致裂机理

doi: 10.11883/bzycj-2023-0336
基金项目: 国家自然科学基金(51934001)
详细信息
    作者简介:

    杨国梁(1979-  ),男,博士,副教授,yanggl531@163.com

    通讯作者:

    毕京九(1995-  ),男,博士研究生,bijingjiu@126.com

  • 中图分类号: O389; TU452

Fracturing mechanism of bedding shale under directional fracture-controlled blasting

  • 摘要: 为探究定向断裂控制爆破下层理页岩的爆破致裂机理,采用切缝药包,对四种切缝角度下的页岩立方体试件进行爆破试验,采用数字图像相关技术(DIC)对页岩试件表面应变场的演化过程进行监测,分析了微裂纹孕育至宏观裂纹贯通的内在机理,并基于盒维数理论计算了不同切缝角度下页岩试件表面裂纹的分形维数,采用Matlab软件对爆后块度的筛分方法进行了编程分析,开发了全自动的粒径分析程序,实现了粒径圈定的可视化。试验结果表明:试件在不同比例爆距内的裂纹总密度与比例爆距之间存在负相关的幂函数关系,切缝方向与层理弱面的夹角对微观损伤区域出现的位置影响显著,当层理弱面与切缝方向平行时,损伤区域多集中于层理弱面处,对宏观裂纹的扩展路径影响显著,易于形成单一裂纹;层理弱面处的能量泄漏是造成页岩爆破破碎效果较差的重要因素,当切缝方向与层理弱面一致时,试件爆后的大块占比较高,爆后块度的分形维数平均值在各组间最低,仅为0.7843,而当切缝方向与层理面垂直时,试件的爆后块度分布较为均匀,爆后块度的分形维数平均值达到了2.5233,爆破破碎效果相对较好。
  • 图  1  页岩切缝角度示意图

    Figure  1.  Schematic diagram of shale fracture angle

    图  2  装药结构示意图

    Figure  2.  Schematic diagram of explosive loading structure

    图  3  不同切缝方向下典型试件的表面裂纹分布

    Figure  3.  Surface pattern distribution of typical specimens with different cutting directions

    图  4  表面裂纹场分析区域

    Figure  4.  Surface crack field analysis area

    图  5  裂纹密度随比例爆距的变化曲线

    Figure  5.  Variation curve of crack density with proportional explosion distance

    图  6  不同比例爆距的区域裂纹密度变化

    Figure  6.  Crack density changes in the explosion zone with different proportions

    图  7  各切缝角度下典型试件的盒维数拟合曲线

    Figure  7.  Box dimension fitting curves of typical specimens at various slit angles

    图  8  试件B-0纵向应变场演化过程

    Figure  8.  Longitudinal strain field evolution process of typical specimens of group B-0

    图  9  试件B-90应变场演化过程(εxx

    Figure  9.  Evolution process of strain field (εxx) of typical specimens of group B-90

    图  11  试件B-90应变场演化过程(εyy

    Figure  11.  Evolution process of strain field (εyy) of typical specimens of group B-90

    图  10  试件B-90应变场演化过程(εxy

    Figure  10.  Evolution process of strain field (εxy) of typical specimens of group B-90

    图  12  试件B-90宏观裂纹的扩展过程

    Figure  12.  Macroscopic crack expansion process of typical specimens of B-90 group shale

    图  13  块度分析程序流程图

    Figure  13.  Blockiness analysis program flow chart

    图  14  试件B-C0块度分布特征

    Figure  14.  Fragment size distribution characteristics of specimens B-C0

    图  15  试件B-0块度分布特征

    Figure  15.  Fragment size distribution characteristics of specimens B-0

    图  16  试件B-45块度分布特征

    Figure  16.  Fragment size distribution characteristics of specimens B-45

    图  17  试件B-90块度分布特征

    Figure  17.  Fragment size distribution characteristics of specimens B-90

    图  18  B-C0试件沿水平层理面的破坏

    Figure  18.  Failure of B-C0 specimen along horizontal bedding plane

    图  19  B-0试件沿水平层理面的破坏

    Figure  19.  Destruction of B-0 specimen along horizontal bedding plane

    图  20  试件B-C0块度分形维数结果

    Figure  20.  Fractal dimension results of specimens B-C0

    图  21  试件B-0块度分形维数结果

    Figure  21.  Fractal dimension results of specimens B-0

    图  22  试件B-45块度分形维数结果

    Figure  22.  Fractal dimension results of specimens B-45

    图  23  试件B-90块度分形维数结果

    Figure  23.  Fractal dimension results of specimens B-90

    图  24  各组试件的爆后碎块分形维数

    Figure  24.  Fractal dimension of post-blast fragments for each group of specimens

    表  1  页岩基础物理力学参数

    Table  1.   Physical and mechanical parameters of shale

    层理倾角/(°) 纵波波速/(m·s−1) 密度/(g·cm−3) 弹性模量/GPa 单轴抗压强度/MPa 单轴抗拉强度/MPa
    0 3050.93 2.53 11.604 130.44 3.189
    30 3100.53 2.48 11.720 104.41 3.753
    60 3184.79 2.57 11.331 93.40 4.475
    90 3212.55 2.55 12.373 114.18 4.561
    下载: 导出CSV

    表  2  各组试件的块度分布指标

    Table  2.   Block size distribution index of orthogonal test

    试件d10/mmd50/mmd90/mmdmax/mmCUCC
    B-C0-148.0988.00102.20113.911.161.58
    B-C0-241.2774.1494.00118.441.271.42
    B-0-123.5851.7978.7285.621.521.45
    B-0-221.9838.0144.3563.221.171.48
    B-45-119.8853.6088.8998.081.661.63
    B-45-221.8341.5373.3575.911.771.08
    B-90-131.7049.0372.9982.091.491.04
    B-90-230.3152.2773.7088.421.411.22
    下载: 导出CSV
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  • 收稿日期:  2023-09-20
  • 修回日期:  2024-01-16
  • 网络出版日期:  2024-03-01

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