基于双炮孔轴向割缝爆破的实验研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (7) : 194-200.

冲击与爆炸

基于双炮孔轴向割缝爆破的实验研究

靳俊晓1,2,3,苏洪*4,韩刚2,3,岳文豪4,李照军5

作者信息 +

Test study on reasonable values of dual-blast hole spacing in axial slot blasting

JIN Junxiao1,2,3, SU Hong*4, HAN Gang2,3, YUE Wenhao4, LI Zhaojun5

Author information +

文章历史 +

摘要

针对轴向割缝爆破中双炮孔间距合理取值的问题，在总结国内外割缝爆破破岩机理的基础上，开展了双炮孔间距为60、80、100、120、140、160mm的有机玻璃（polymethyl methacrylate，PMMA）室内对比爆破试验，采用数字激光焦散线方法，展现炮孔割缝爆破裂纹扩展及焦散斑演化过程，揭示了炮孔间距及割缝对岩体爆生裂纹扩展影响的规律。研究结果表明：随着双炮孔间距的增加，割缝爆破裂纹扩展长度、主裂纹扩展速度均呈现先增加后降低的趋势，而应力强度因子变化规律呈现先增大后减小再增大再减小的复杂振荡变化规律。双炮孔内侧割缝方向上裂纹呈现出相互“勾连”的现象，但勾连的现象随着炮孔间距的增长逐渐衰减，双炮孔内侧主裂纹的裂纹扩展速度在裂纹扩展初始均出现了速度提升的现象。在割缝条件下双炮孔间距为120mm~140mm的试件定向断裂效果最优。研究结果可为厚硬关键层割缝爆破参数设计提供参考。

Abstract

For the problem of reasonable value selection of the spacing between the double-hole blasting in axial slit blasting, based on summarizing the rock-breaking mechanism of slit blasting at home and abroad, indoor comparative blasting tests of polymethyl methacrylate（PMMA） with single-row holes and double blast hole spacing of 60, 80, 100, 120, 140, and 160 mm were carried out. By using the digital laser caustic line method, the crack propagation and caustic spot evolution process of blast hole slit blasting were presented, and the law of the influence of blast hole spacing and slit on the propagation of blasting-induced cracks in rock mass was revealed. The research results show that: with the increase of the distance between double blast holes, the crack propagation length and the main crack propagation speed of slit blasting show a trend of first increasing and then decreasing, while the change law of the stress intensity factor shows a complex oscillatory change law of first increasing, then decreasing, then increasing again, and then decreasing again. The cracks in the direction of the slit on the inner side of the double blast holes show a phenomenon of mutual "hooking", but the hooking phenomenon gradually decays with the increase of the distance between the blast holes, and the crack propagation speed of the main crack on the inner side ofthe double blast holes shows a phenomenon of speed increase at the beginning of crack propagation. Under the condition of slit, the specimen with the distance between double blast holes of 120 mm to 140 mm has the best directional fracture effect. The research results can provide a reference for the design of slit blasting parameters of thick and hard key strata.

导出引用

靳俊晓1, 2, 3, 苏洪4, 韩刚2, 3, 岳文豪4, 李照军5. 基于双炮孔轴向割缝爆破的实验研究[J]. 振动与冲击, 2025, 44(7): 194-200

JIN Junxiao1, 2, 3, SU Hong4, HAN Gang2, 3, YUE Wenhao4, LI Zhaojun5. Test study on reasonable values of dual-blast hole spacing in axial slot blasting[J]. Journal of Vibration and Shock, 2025, 44(7): 194-200

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