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<p>Blasting is widely used in modern engineering construction owing to its speed, efficiency, and low cost. However, the vibration effects caused by blasting resulted severe cracking of the rock-anchored beam. Using a pumped-storage power station building in East China as the engineering background, on-site blasting tests at the busbar tunnel section were conducted to measure the vibration speed of a rock-anchored beam during blasting. Using the LS-DYNA dynamic analysis platform, we established a 3D numerical model of an underground power plant and validated the model with test data obtained from sensors. A blasting plan for the excavation layer in the machinery room section was proposed to explore the rock fragmentation rate at the midsection groove and the protective layer on both sides for various detonation methods, as well as the vibration velocity at remote measuring points. The results show that a reasonable detonation sequence can increase the rock fragmentation rate by approximately 9% without increasing economic costs. By adopting a row-by-row detonation scheme, the peak blasting vibration velocity in all directions was reduced, thereby reducing the effects of blasting vibration by approximately 77%. These make the on-site rock-anchored beam meet the control standards well, thus providing technical support for the designing drilling and blasting schemes for similar projects.</p>

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Blasting Optimization for Underground Power House Construction: Field Experiments and Numerical Validation

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Xiaocui Chen,
  • Yuan Mi,
  • Xinru Shuai,
  • Wenhu Zhao,
  • Yuan Zheng,
  • Xiji Li

摘要

Blasting is widely used in modern engineering construction owing to its speed, efficiency, and low cost. However, the vibration effects caused by blasting resulted severe cracking of the rock-anchored beam. Using a pumped-storage power station building in East China as the engineering background, on-site blasting tests at the busbar tunnel section were conducted to measure the vibration speed of a rock-anchored beam during blasting. Using the LS-DYNA dynamic analysis platform, we established a 3D numerical model of an underground power plant and validated the model with test data obtained from sensors. A blasting plan for the excavation layer in the machinery room section was proposed to explore the rock fragmentation rate at the midsection groove and the protective layer on both sides for various detonation methods, as well as the vibration velocity at remote measuring points. The results show that a reasonable detonation sequence can increase the rock fragmentation rate by approximately 9% without increasing economic costs. By adopting a row-by-row detonation scheme, the peak blasting vibration velocity in all directions was reduced, thereby reducing the effects of blasting vibration by approximately 77%. These make the on-site rock-anchored beam meet the control standards well, thus providing technical support for the designing drilling and blasting schemes for similar projects.