不同割缝宽度爆生裂纹扩展行为研究

纪哲 岳文豪 苏洪 龚悦 严正团 刘步青 陈国栋 韩雨健

纪哲, 岳文豪, 苏洪, 龚悦, 严正团, 刘步青, 陈国栋, 韩雨健. 不同割缝宽度爆生裂纹扩展行为研究[J]. 高压物理学报, 2024, 38(6): 064107. doi: 10.11858/gywlxb.20240733
引用本文: 纪哲, 岳文豪, 苏洪, 龚悦, 严正团, 刘步青, 陈国栋, 韩雨健. 不同割缝宽度爆生裂纹扩展行为研究[J]. 高压物理学报, 2024, 38(6): 064107. doi: 10.11858/gywlxb.20240733
JI Zhe, YUE Wenhao, SU Hong, GONG Yue, YAN Zhengtuan, LIU Buqing, CHEN Guodong, HAN Yujian. Study on the Behavior of Blasting Crack Propagation under Different Crack Widths[J]. Chinese Journal of High Pressure Physics, 2024, 38(6): 064107. doi: 10.11858/gywlxb.20240733
Citation: JI Zhe, YUE Wenhao, SU Hong, GONG Yue, YAN Zhengtuan, LIU Buqing, CHEN Guodong, HAN Yujian. Study on the Behavior of Blasting Crack Propagation under Different Crack Widths[J]. Chinese Journal of High Pressure Physics, 2024, 38(6): 064107. doi: 10.11858/gywlxb.20240733

不同割缝宽度爆生裂纹扩展行为研究

doi: 10.11858/gywlxb.20240733
基金项目: 国家自然科学基金(52104074);精细爆破国家重点实验室开放基金(PBSKL2023A5)
详细信息
    作者简介:

    纪 哲(2000-),男,硕士研究生,主要从事岩石破碎理论与技术研究. E-mail:971455450@qq.com

    通讯作者:

    苏 洪(1987-),男,博士,副教授,主要从事岩石动态断裂研究. E-mail:suhonggy2016@163.com

  • 中图分类号: O346.1; O521.9

Study on the Behavior of Blasting Crack Propagation under Different Crack Widths

  • 摘要: 为探讨炮孔不同割缝宽度对爆生裂纹动态扩展行为的影响,采用数字激光动态焦散线实验系统和分形理论,研究了6种不同割缝宽度时爆生裂纹的扩展规律。结果表明:割缝方向的爆生裂纹长度均大于非割缝方向的爆生裂纹长度;随着割缝宽度的增加,爆生裂纹扩展长度呈现先增大后减小的变化趋势;当割缝宽度增加到0.4 mm时,主裂纹扩展长度最大,割缝宽度继续增加后,主裂纹扩展长度减小。当割缝宽度为0.2 和0.4 mm时,分形维数较其他割缝宽度更大,爆生主裂纹的扩展长度较其他宽度下的扩展长度更长,试件定向断裂效果更优。随着割缝宽度的增加,割缝主裂纹的扩展应力强度因子和速度峰值呈现先快速降低再增加至二次峰值,最后振荡下降的变化趋势。割缝宽度为0.2和0.4 mm时,主裂纹应力强度因子的峰值和扩展速度峰值较其他割缝宽度更大。研究成果可为实际爆破工程中的割缝参数选择提供依据。

     

  • 图  焦散成像原理

    Figure  1.  Principle of caustic imaging

    图  动焦散实验系统实物照片和原理示意图

    Figure  2.  Photo and schematic diagram of the dynamic caustic experimental system

    图  实验方案示意图

    Figure  3.  Schematic diagram of experimental scheme

    图  不同割缝宽度(0.1、0.2、0.4、0.6、0.8、1.0 mm)试件的爆后裂纹分布

    Figure  4.  Crack distribution of specimens with different slit widths (0.1, 0.2, 0.4, 0.6, 0.8, 1.0 mm) after blasting

    图  焦散斑演化过程

    Figure  5.  Evolution of caustic speckle

    图  割缝左侧焦散斑直径-时间演化曲线

    Figure  6.  Diameter-time evolution curves of caustic speckle on the left side of slit

    图  试件左侧裂纹尖端的应力强度因子

    Figure  7.  Stress intensity factor at the crack tip on the left side of the specimen

    图  割缝裂纹面受力分析

    Figure  8.  Force analysis of the crack surface of the slit

    图  不同割缝宽度下左侧裂纹的扩展速度-时间曲线

    Figure  9.  Velocity-time curves of left crack propagation under different slit widths

    图  10  计盒维数拟合结果

    Figure  10.  Fitting results of box dimension

    表  1  PMMA的动态力学参数[26]

    Table  1.   Dynamic mechanical parameters of PMMA[26]

    $ {E}_{\mathrm{d}} $/GPa $ \mu_{\mathrm{ }} $ |$ c $|/(m2·N−1) $ c_{\mathrm{p}} $/(m·s−1) $ {c}_{\mathrm{s}} $/(m·s−1)
    6.10 0.31 0.88×10−10 2320 1260
    下载: 导出CSV

    表  2  裂纹的扩展长度

    Table  2.   Propagation lengths of the crack

    L/mmCrack length/mm
    LeftRight
    0.141.441.3
    0.263.564.0
    0.469.073.0
    0.657.246.2
    0.838.440.0
    1.039.737.4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-02-26
  • 修回日期:  2024-04-01
  • 网络出版日期:  2024-11-25
  • 刊出日期:  2024-12-05

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