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首页> 外文期刊>Shock and vibration >A Preliminary Study on the Design Method for Large-Diameter Deep-Hole Presplit Blasting and Its Vibration-Isolation Effect
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A Preliminary Study on the Design Method for Large-Diameter Deep-Hole Presplit Blasting and Its Vibration-Isolation Effect

机译：大直径深孔防桩爆破设计方法及其振动隔离效果的初步研究

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摘要

Presplit blasting can reduce vibration and back impact induced by cast blasting, thus resulting in a smooth bench slope. To design reasonable presplit blasting parameters, this research investigated the formation of presplit faces based on the explosion mechanics and revealed the cracking mechanism of presplit blasting. According to the stress distribution in the vicinity of the blast holes under the action of explosive stress waves and blasting gas, we deduced theoretical formulae for parameters including charge mass in blast holes, hole spacing, and distance from presplit blast holes to cushion holes. On this basis, a method was proposed for the design of large-diameter deep-hole presplit blasting. Field testing was conducted by setting different spacing for presplit blast holes, to monitor the blasting-induced vibration. The results showed that appropriate hole spacing can reduce the particle vibration velocity and the attenuation index of blasting-induced vibration changed slightly while the attenuation coefficient decreased significantly; the formed presplit faces were smooth and had a high half-cast factor. Finally, the reasonable hole spacing for presplit blasting, distance from presplit blast hole to the cushion hole, and the charge mass in blast holes in the Heidaigou open-pit coal mine were determined, respectively.
机译：Prespit Blastping可以减少通过铸造爆破引起的振动和背部冲击，从而导致平滑的台坡。为了设计合理的防普特爆破参数，本研究研究了基于爆炸力学的Prespit面的形成，并揭示了防柱爆破的开裂机制。根据爆炸应力波和爆破气体作用下的爆破孔附近的应力分布，我们推断了包括喷孔，孔间距和远程喷射孔的电荷质量的参数的理论公式，以及从防柱鼓胀到缓冲孔的距离。在此基础上，提出了一种方法，用于设计大直径深孔防爆爆破。通过设定不同的间距来进行现场测试，用于监测爆破诱导的振动。结果表明，适当的孔间距可以降低颗粒振动速度，并且爆破诱导的振动的衰减指数略微发生变化，而衰减系数显着降低;所形成的预柱面光滑，具有较高的半铸造因子。最后，确定了用于预剥离的合理孔间距，从垫子孔到缓冲孔的远程喷射孔的距离，以及海德沟沟煤矿的鼓风孔中的电荷质量。

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  • 来源
    《Shock and vibration》 |2019年第11期|2038578.1-2038578.11|共11页
  • 作者

    Xiao Shuangshuang; Wang Hongsheng; Dong Guowei;

  • 作者单位

    Xian Univ Sci & Technol Sch Energy Engn Xian 710054 Shaanxi Peoples R China|Shaanxi Prov Key Lab Ground Controlling Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Sch Energy Engn Xian 710054 Shaanxi Peoples R China|Shaanxi Prov Key Lab Ground Controlling Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Sch Energy Engn Xian 710054 Shaanxi Peoples R China|Shaanxi Prov Key Lab Ground Controlling Xian 710054 Shaanxi Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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