Borehole Blasting-Induced Fractures in Rocks

GUO Xiaojun WEN Heming

郭晓钧, 文鹤鸣. 岩石钻孔爆炸致裂研究[J]. 高压物理学报, 2021, 35(6): 064203. doi: 10.11858/gywlxb.20210763
引用本文: 郭晓钧, 文鹤鸣. 岩石钻孔爆炸致裂研究[J]. 高压物理学报, 2021, 35(6): 064203. doi: 10.11858/gywlxb.20210763
GUO Xiaojun, WEN Heming. Borehole Blasting-Induced Fractures in Rocks[J]. Chinese Journal of High Pressure Physics, 2021, 35(6): 064203. doi: 10.11858/gywlxb.20210763
Citation: GUO Xiaojun, WEN Heming. Borehole Blasting-Induced Fractures in Rocks[J]. Chinese Journal of High Pressure Physics, 2021, 35(6): 064203. doi: 10.11858/gywlxb.20210763

Borehole Blasting-Induced Fractures in Rocks

doi: 10.11858/gywlxb.20210763
Funds: Doctoral Program of Nanchang Hangkong University (EA201511012)
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    Author Bio:

    GUO Xiaojun (1982-), male, doctoral student, major in impact dynamics. E-mail: xjguo@mail.ustc.edu.cn

    Corresponding author: WEN Heming (1965-), male, Ph.D, professor, major in impact dynamics. E-mail: hmwen@ustc.edu.cn
  • 摘要: 岩石在爆炸载荷作用下的动态断裂行为得到了土木、岩石、采矿、石油和天然气等工业领域的关注。为此,研究了岩石钻孔的爆炸致裂问题。首先简单描述了岩石的动态本构模型,确定了花岗岩动态本构模型的参数;然后利用该模型对岩石钻孔爆炸致裂进行了数值模拟;最后将数值模拟结果与花岗岩钻孔爆炸实验结果进行比较。结果表明:数值模拟预测的峰值压力和开裂形貌与文献报道的柱形花岗岩实验观察结果吻合较好,并且数值模拟得出的开裂形貌还与方形花岗岩实验观察结果较一致;开裂形貌主要由拉伸应力造成,而钻孔周围的小裂纹主要由压缩/剪切应力造成。

     

  • Figure  1.  Schematic diagram of EOS[7]

    Figure  2.  Schematic diagram of the residual strength surface for rock in total stress space

    Figure  3.  Comparison of the strength surface between Eq.(6) (with B=2.59, N=0.66) and the triaxial test data for granite[17]

    Figure  4.  Tension dynamic increase factor obtained by Eq.(10) and the test results of various rocks at different strain rates[18-23]

    Figure  5.  Close-up view of the borehole region showing the material positions and the meshes

    Figure  6.  Relation between the peak pressure and the distance from the borehole wall in granite

    Figure  7.  Comparison of the crack patterns between the numerical prediction and the experiment of the cylindrical granite sample[17]

    Figure  8.  Numerically predicted crack pattern resulting from tension stress only

    Figure  9.  Square granite sample

    Figure  10.  Cross-section of the cylindrical RDX enclosed by an aluminum sheath

    Figure  11.  Comparison of the crack patterns between the numerical prediction and the experiment with the square granite No.1 sample

    Figure  12.  Comparison of the crack patterns between the numerical prediction andthe experiment with the square granite No.2 sample

    Table  1.   Values of various parameters for granite[7, 15-17]

    p-$\alpha$ relation
    ${\,\rho {_0}}$/(kg∙m−3)${p{_{ {\text{crush} } } }}$/MPa${p{_{ {\text{lock} } } } }$/GPa nK1/GPa K2/TPaK3/TPa
    266050.53 325.7 −3150
    Strength surfaceStrain rate effect
    ${f{_{\text{c} } } }'$/MPa${f{_{\text{t} } }}$/MPaB NG/GPa ${F{_{\text{m} }} }$Wx
    161.57.32.59 0.6621.9 101.6
    Strain rate effectShear damage
    WyS${\dot \varepsilon {_0}}$/s−1 $\lambda{_\text{s}}$$\lambda{_\text{m}}$ lr
    5.50.81.0 4.60.3 0.450.3
    Lode effectTensile damage
    e1e2e3 c1c2 $\varepsilon $frac
    0.650.015 36.93 0.007
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  • 收稿日期:  2021-03-31
  • 修回日期:  2021-04-16

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