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双孔聚能爆破煤层裂隙扩展贯通机理

郭德勇 赵杰超 朱同功 张超

郭德勇, 赵杰超, 朱同功, 张超. 双孔聚能爆破煤层裂隙扩展贯通机理[J]. 工程科学学报, 2020, 42(12): 1613-1623. doi: 10.13374/j.issn2095-9389.2020.05.19.001
引用本文: 郭德勇, 赵杰超, 朱同功, 张超. 双孔聚能爆破煤层裂隙扩展贯通机理[J]. 工程科学学报, 2020, 42(12): 1613-1623. doi: 10.13374/j.issn2095-9389.2020.05.19.001
GUO De-yong, ZHAO Jie-chao, ZHU Tong-gong, ZHANG Chao. Crack propagation and coalescence mechanism of double-hole cumulative blasting in coal seam[J]. Chinese Journal of Engineering, 2020, 42(12): 1613-1623. doi: 10.13374/j.issn2095-9389.2020.05.19.001
Citation: GUO De-yong, ZHAO Jie-chao, ZHU Tong-gong, ZHANG Chao. Crack propagation and coalescence mechanism of double-hole cumulative blasting in coal seam[J]. Chinese Journal of Engineering, 2020, 42(12): 1613-1623. doi: 10.13374/j.issn2095-9389.2020.05.19.001

双孔聚能爆破煤层裂隙扩展贯通机理

doi: 10.13374/j.issn2095-9389.2020.05.19.001
基金项目: 国家自然科学基金联合基金资助项目(U1704242);国家自然科学基金资助项目(41430640)
详细信息
    通讯作者:

    E-mail:kjkfg@cumtb.edu.cn

  • 中图分类号: TD712

Crack propagation and coalescence mechanism of double-hole cumulative blasting in coal seam

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  • 摘要: 针对双孔聚能爆破孔间煤层裂隙扩展贯通问题,基于对双孔爆破应力波叠加效应的分析,建立双孔聚能爆破数值分析模型,研究双孔同时起爆时应力波的传播特征、煤体的应力状态、煤体裂隙扩展贯通规律以及应力波叠加效应对裂隙扩展的影响。结果表明,应力波叠加效应致使两爆破孔中间截面上部分区域及其邻域内形成均压区,迫使部分径向裂隙转向,主导爆生裂隙空白带的形成;两爆破孔间的定向裂隙相互贯通后,爆生气体相互作用促进贯通区裂隙的扩展并贯穿空白带。同时,结合煤层深孔聚能爆破现场试验发现,在两爆破孔外侧,应力波叠加效应促进裂隙的扩展,该作用随着远离爆破孔呈先增加后减小之势;在两爆破孔之间,应力波叠加效应抑制部分区域裂隙的扩展,致使两爆破孔之间不同位置处煤层增透效果有起伏变化。
  • 图  1  两束应力波的正交(a)、斜交(b)干涉

    Figure  1.  Orthogonal (a) and oblique (b) interferences of the pressure waves

    图  2  斜交干涉时系数k1k2的变化曲线

    Figure  2.  Oblique interference of the stress waves

    图  3  煤层深孔聚能爆破数值分析模型

    Figure  3.  Numerical model of cumulative blasting with linear shaped charge in a coal seam

    图  4  煤层深孔聚能爆破双孔同时起爆时应力波的传播与干涉过程。(a)t=1555 μs;(b)t=1710 μs;(c)t=1930 μs;(d)t=3250 μs

    Figure  4.  Stress wave propagation and interference process during the simultaneous detonation of two blastholes: (a) t=1555 μs; (b) t=1710 μs; (c) t=1930 μs; (d) t=3250 μs

    图  5  煤层深孔聚能爆破模型中各个测点单元位置分布

    Figure  5.  Position distribution of each measuring point in the cumulative blasting model

    图  6  煤层深孔聚能爆破双孔齐爆时各个测点单元应力(爆炸压力)变化曲线

    Figure  6.  Pressure curve of each measuring point during the simultaneous detonation of two blastholes

    图  7  煤层深孔聚能爆破相邻两孔同时起爆后裂隙扩展贯通过程。(a)t=2500 μs;(b)t=2925 μs;(c)t=3085 μs;(d)t=6000 μs

    Figure  7.  Expansion and penetration process of coal seam fractures during the simultaneous detonation of two blastholes: (a) t = 2500 μs; (b) t = 2925 μs; (c) t = 3085 μs; (d) t = 6000 μs

    图  8  煤层深孔普通爆破相邻两孔同时起爆后裂隙扩展特征[26]

    Figure  8.  Propagation characteristics of coal seam fractures under double deep-hole blasting[26]

    图  9  煤层深孔聚能爆破相邻两孔同时起爆过程中应力波对两爆破孔之间裂隙扩展的影响。(a)t=1955 μs;(b)t=2320 μs;(c)t=2965 μs;(d)t=3085 μs;(e)t=4355 μs;(f)t=5630 μs

    Figure  9.  Effect of the stress wave on crack propagation between two blastholes during the simultaneous detonation of two blastholes: (a) t=1955 μs;(b) t=2320 μs;(c) t=2965 μs;(d) t=3085 μs;(e) t=4355 μs;(f) t=5630 μs

    图  10  煤层深孔聚能爆破相邻两孔同时起爆过程中应力波对两爆破孔左侧和右侧的裂隙扩展影响。(a)t=3085 μs;(b)t=4355 μs;(c)t=5630 μs

    Figure  10.  Effect of the stress wave on crack propagation on the left and right side of two blastholes during the simultaneous detonation of two blastholes: (a) t=3085 μs; (b) t=4355 μs; (c) t=5630 μs

    图  11  煤层深孔聚能爆破试验钻孔布置示意图(单位:m)。(a)单孔爆破;(b)双孔间隔5 m齐爆;(c)双孔间隔9 m齐爆

    Figure  11.  Trial borehole layout of deep-hole cumulative blasting (unit: m): (a) single-hole blasting; (b) simultaneous explosion of two blastholes at 5-m intervals; (c) simultaneous explosion of two blastholes at 9-m intervals

    图  12  煤层深孔聚能爆破前后各个考察孔内瓦斯体积分数及纯流量变化规律。(a~b)单孔爆破;(c~d)双孔爆破;(e~f)单/双孔对比

    Figure  12.  Variations in gas volume fraction and gas pure flow in each test hole before and after cumulative blasting: (a−b) single-hole blasting; (c−d) double-hole blasting; (e−f) single-/double-hole blasting comparison

    图  13  煤层深孔聚能爆破后各个考察孔内瓦斯体积分数(a)及纯流量(b)对比图

    Figure  13.  Comparison of gas volume fraction (a) and gas pure flow (b) in each test hole

    图  14  煤层深孔聚能爆破后两爆破孔之间各个考察孔内瓦斯体积分数(a)及纯流量(b)对比图

    Figure  14.  Comparison of gas volume fractions (a) and gas pure flow (b) in each observation hole between two blastholes

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  • 收稿日期:  2020-05-19
  • 刊出日期:  2020-12-25

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