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基于双向聚能拉张爆破理论的巷道顶板定向预裂

何满潮 郭鹏飞 张晓虎 王炯

何满潮, 郭鹏飞, 张晓虎, 王炯. 基于双向聚能拉张爆破理论的巷道顶板定向预裂[J]. 爆炸与冲击, 2018, 38(4): 795-803. doi: 10.11883/bzycj-2016-0359
引用本文: 何满潮, 郭鹏飞, 张晓虎, 王炯. 基于双向聚能拉张爆破理论的巷道顶板定向预裂[J]. 爆炸与冲击, 2018, 38(4): 795-803. doi: 10.11883/bzycj-2016-0359
HE Manchao, GUO Pengfei, ZHANG Xiaohu, WANG Jiong. Directional pre-splitting of roadway roof based on the theory of bilateral cumulative tensile explosion[J]. Explosion And Shock Waves, 2018, 38(4): 795-803. doi: 10.11883/bzycj-2016-0359
Citation: HE Manchao, GUO Pengfei, ZHANG Xiaohu, WANG Jiong. Directional pre-splitting of roadway roof based on the theory of bilateral cumulative tensile explosion[J]. Explosion And Shock Waves, 2018, 38(4): 795-803. doi: 10.11883/bzycj-2016-0359

基于双向聚能拉张爆破理论的巷道顶板定向预裂

doi: 10.11883/bzycj-2016-0359
基金项目: 

国家重点研发计划项目 2016YFC0600900

国家自然科学基金项目 41602308

详细信息
    作者简介:

    何满潮(1956-), 男, 博士, 教授

    通讯作者:

    郭鹏飞, 853438955@qq.com

  • 中图分类号: O389;TD235.4

Directional pre-splitting of roadway roof based on the theory of bilateral cumulative tensile explosion

  • 摘要: 为在切顶卸压沿空留巷中获得巷道顶板预裂炮孔的最优间距,基于双向聚能拉张爆破技术,采用以LS-DYNA动力分析软件为基础的数值模拟和现场试验对巷道顶板定向预裂进行研究,优化炮孔间距。数值模拟结果表明,当炮孔间距为400 mm时,应力波叠加后产生有效的拉应力;当炮孔间距为500 mm时,应力波叠加后也能够产生有效的拉应力,该拉应力大于孔壁围岩的抗拉强度,能够使孔壁围岩沿聚能方向形成裂缝,且利于炮孔间裂纹的扩展;随着炮孔间距进一步的增大,当炮孔间距为600 mm爆破时,由于间距过大,应力波无法有效叠加,不能产生连续裂缝。现场试验表明,间距为400和500 mm的炮孔间隔爆破时,未爆破孔自炮孔孔底至孔口产生连续有效裂缝,裂缝长度达2.4 m,相邻炮孔间沿炮孔中心线均能够形成连续有效的切缝面,能够有效控制沿空巷道顶底板位移及沿空巷道顶板压力。综合分析,在3种不同炮孔间距的试验方案中,确定间隔爆破、500 mm的炮孔间距为同一地质条件下3种试验设计中的最优方案。
  • 图  1  双向聚能拉张爆破作用原理

    Figure  1.  Principle of bilateral cumulative tension blasting

    图  2  未定向预裂时沿空巷道围岩结构

    Figure  2.  Structure of surrounding rock of gob-side entry before directional presplitting

    图  3  定向预裂后留巷围岩结构

    Figure  3.  Structure of surrounding rock of gob-side entry after directional presplitting

    图  4  双向聚能拉张爆破断裂力学模型[14]

    Figure  4.  Fracture mechanical model of bilateral cumulative tension blasting[14]

    图  5  爆破孔布置及爆破方法

    Figure  5.  Blasting hole arrangement and blasting method

    图  6  不同间距炮孔爆破后0.2 ms y方向应力分布

    Figure  6.  y-direction stress distribution after blasting with different hole spacings

    图  7  不同间距炮孔爆破时裂缝效果

    Figure  7.  Crack effect when blasting with different hole spacings

    图  8  爆破时模型中测点y向应力平均值变化规律

    Figure  8.  Variation of average stress in y direction at the gauge point during the blasting process

    图  9  聚能爆破单孔装药示意图

    Figure  9.  Illustration of single hole charge in cumulative blasting

    图  10  试验方案区域划分及装药方式

    Figure  10.  Regional division of test plan and its relative position

    图  11  间隔孔孔内裂缝情况(平面展开)

    Figure  11.  Crack in spacing hole (plane unfolded)

    图  12  不同间距炮孔对应区域沿空巷道顶底板位移及顶板压力曲线

    Figure  12.  Roof and floor displacement and roof pressure curves of corresponding regions in gob-side entry with different hole spacings

    表  1  炸药参数

    Table  1.   Explosive parameters

    ρ/(g·cm-3) D/(m·s-1) p/GPa A/GPa B/GPa R1 R2 ω E0/GPa
    1.2 3 800 27 326 5.81 5.81 1.56 0.57 2.67
    下载: 导出CSV

    表  2  模型中岩石基本力学参数

    Table  2.   Basic mechanical parameters of rock in the model

    ρ/(g·cm-3) ν cP/(m·s-1) cS/(m·s-1) K/GPa G/GPa fc/MPa T/MPa
    2.56 0.34 3 835 2 665 25.7 21.9 67.1 6.8
    下载: 导出CSV

    表  3  聚能管材力学参数

    Table  3.   Mechanical parameters of shaped pipe

    ρ/(g·cm-3) E/GPa GPVC/GPa σY/MPa ν
    1.43 43 3.2 61.7 0.32
    下载: 导出CSV

    表  4  方案设计

    Table  4.   Schematic design

    No. L/mm D/mm 起爆方式
    1 400 48 间隔爆破
    2 400 48 连孔爆破
    3 500 48 间隔爆破
    4 500 48 连孔爆破
    5 600 48 间隔爆破
    6 600 48 连孔爆破
    下载: 导出CSV

    表  5  现场试验方案设计

    Table  5.   Design of field test scheme

    编号 距切眼距离/m L/mm 孔深/m 倾角/(°) 不耦合系数 D/mm 装药
    1 250-350 400 3.5 20 1.5 48 3卷、1.5 m聚能管、填塞2 m
    2 350-450 500 3.5 20 1.5 48 3卷、1.5 m聚能管、填塞2 m
    3 350-650 600 3.5 20 1.5 48 3卷、1.5 m聚能管、填塞2 m
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-11-29
  • 修回日期:  2017-03-13
  • 刊出日期:  2018-07-25

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