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<p>Aiming at the problems of efficiency and safety control in the blasting excavation of deep foundation pits supported by rock-embedded piles, a numerical model was developed using ANSYS/LS-DYNA software based on the deep foundation pit project of Qingdao Huicheng Road Station. It was combined with the orthogonal test method to assess the coupled influence of micro-difference time, blasting fluid volume, and the spacing of blast holes on the volume of blasting damage, peak vibration velocity of particles, and displacement. The results show that the volume of blasting damage is most significantly affected by the amount of explosives (with a range of 4.87%). The minimum spacing of the blast holes is 2.0&#xa0;m, and the optimal combination <i>A</i><sub>1</sub><i>B</i><sub>3</sub><i>C</i><sub>2</sub> (1&#xa0;ms + 2.0&#xa0;m + 1.1&#xa0;m) results in a damage volume ratio of 67.53%. The PPV of the surrounding rock and embedded rock piles is dominated by the delay time (with a range of 9.1&#xa0;cm/s), and the minimum amount of explosives is used. The optimal combination <i>A</i><sub>2</sub><i>B</i><sub>3</sub><i>C</i><sub>1</sub> (3&#xa0;ms + 2.0&#xa0;m + 1.0&#xa0;m) can maximize vibration control. Using the entropy weight method for objective weighting, combination <i>A</i><sub>2</sub><i>B</i><sub>3</sub><i>C</i><sub>1</sub> is determined as the comprehensive optimal solution, which increases the volume of blasting damage by 47.33%, reduces the maximum PPV of the surrounding rock by 80.83%, and decreases the PPV of the critical (<i>i.e</i>. most dangerous) points of the embedded rock piles by 83.80%. The method integrating orthogonal experiments with the entropy weight method balances the blasting effect and safety control, providing a theoretical basis for optimizing the blasting parameters used to excavate deep foundation pits.</p>

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Orthogonal experimental study on the simulated optimization of blasting parameters for deep foundation pit excavation supported by rock-socketed piles

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月11日

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  • Hongliang Ji,
  • Keqiang He,
  • Yanlong Sun,
  • Ziyang Liu,
  • Linna Sun,
  • Zeyuan Xia

摘要

Aiming at the problems of efficiency and safety control in the blasting excavation of deep foundation pits supported by rock-embedded piles, a numerical model was developed using ANSYS/LS-DYNA software based on the deep foundation pit project of Qingdao Huicheng Road Station. It was combined with the orthogonal test method to assess the coupled influence of micro-difference time, blasting fluid volume, and the spacing of blast holes on the volume of blasting damage, peak vibration velocity of particles, and displacement. The results show that the volume of blasting damage is most significantly affected by the amount of explosives (with a range of 4.87%). The minimum spacing of the blast holes is 2.0 m, and the optimal combination A1B3C2 (1 ms + 2.0 m + 1.1 m) results in a damage volume ratio of 67.53%. The PPV of the surrounding rock and embedded rock piles is dominated by the delay time (with a range of 9.1 cm/s), and the minimum amount of explosives is used. The optimal combination A2B3C1 (3 ms + 2.0 m + 1.0 m) can maximize vibration control. Using the entropy weight method for objective weighting, combination A2B3C1 is determined as the comprehensive optimal solution, which increases the volume of blasting damage by 47.33%, reduces the maximum PPV of the surrounding rock by 80.83%, and decreases the PPV of the critical (i.e. most dangerous) points of the embedded rock piles by 83.80%. The method integrating orthogonal experiments with the entropy weight method balances the blasting effect and safety control, providing a theoretical basis for optimizing the blasting parameters used to excavate deep foundation pits.