Scholarlink

<p>In open-pit mines, blasting is regarded as a low-cost and efficient method of rock crushing. However, the negative effects of blasting vibrations on open slopes and buildings during explosive blasts should be given sufficient attention. In this study, to realize blast reduction, a reasonable delay time calculation method between holes is proposed based on the principles of interval estimation and staggered-phase superposition. By monitoring the blasting vibration wave of a single blast hole, it is found that the principal frequency at different distances approximately obeys a normal distribution. The dominant principal frequency was estimated to be 23&#xa0;Hz by the Bootstrap method, and the reasonable delay time between holes was determined to be 22&#xa0;ms by combining with the principle of staggered-phase superposition, which was verified by numerical simulation and field test. Numerical simulation results show that double-hole and multi-hole blasting with a 22&#xa0;ms delay between holes have the best vibration reduction effect. In the engineering application, the PPV of multi-hole blast blasting with 22&#xa0;ms delay between holes was significantly reduced at different monitoring points. Compared with the original delay time of 42&#xa0;ms, the average vibration reduction rates in the horizontal radial, horizontal tangential, and vertical directions at different monitoring points are 29.51%, 10.14%, and 23.68%, respectively. These findings offer valuable insights and can serve as a reference for optimizing blasting operations in similar open-pit mining projects.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Millisecond Delay Time Optimization and Its Effect on Blasting Vibration Reduction in an Open Pit Mine

  • 期刊论文

  • 发表日期：

    2026年1月29日

查看全文
  • Peng Yan,
  • Xi Yang,
  • Yunpeng Zhang,
  • Shanying Hou,
  • Deqing Gan

摘要

In open-pit mines, blasting is regarded as a low-cost and efficient method of rock crushing. However, the negative effects of blasting vibrations on open slopes and buildings during explosive blasts should be given sufficient attention. In this study, to realize blast reduction, a reasonable delay time calculation method between holes is proposed based on the principles of interval estimation and staggered-phase superposition. By monitoring the blasting vibration wave of a single blast hole, it is found that the principal frequency at different distances approximately obeys a normal distribution. The dominant principal frequency was estimated to be 23 Hz by the Bootstrap method, and the reasonable delay time between holes was determined to be 22 ms by combining with the principle of staggered-phase superposition, which was verified by numerical simulation and field test. Numerical simulation results show that double-hole and multi-hole blasting with a 22 ms delay between holes have the best vibration reduction effect. In the engineering application, the PPV of multi-hole blast blasting with 22 ms delay between holes was significantly reduced at different monitoring points. Compared with the original delay time of 42 ms, the average vibration reduction rates in the horizontal radial, horizontal tangential, and vertical directions at different monitoring points are 29.51%, 10.14%, and 23.68%, respectively. These findings offer valuable insights and can serve as a reference for optimizing blasting operations in similar open-pit mining projects.