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<p>A novel J energy-absorbing bolt (J-bolt) has been developed to resist dynamic loads produced by rockburst. First, a dynamic impact constitutive model of the J-bolt is established through laboratory experiments and theoretical analysis. Then, the J-bolt’s dynamic performance is simulated using numerical software at various impact energy levels, with different numbers of joints, and under repeated impacts based on experimental studies. Finally, an anchor support design scheme for the Hongtoushan copper mine, which is prone to rockburst, is formulated using the energy method. Three safety factors for displacement, load, and energy are proposed, and the support scheme’s safety is verified using field monitoring data. The results show that as follows: (1) The J-bolt can resist impacts with energies above 19.03&#xa0;kJ. At this stage, the J-bolt’s deformation has passed through three stages: elastic deformation, plastic deformation, and elastic deformation rebound. (2) The J-bolt’s deformation displacement increases with increasing joint numbers. The J-bolt’s stress and strain values reach maxima at the joints. (3) The J-bolt can withstand two impacts with energy of 19.0&#xa0;kJ, and the accumulated energy absorption capacity of the J-bolt exceeds 38.06&#xa0;kJ. On a third impact, fracture damage occurs in the J-bolt, and the stress and strain changes in the J-bolt differ from the results of the previous impacts. These results can also be used as criteria to identify the damage occurring in the J-bolt. (4) The three safety coefficients for displacement, load, and energy all exceed 1.5, indicating that the proposed J-bolt support scheme can maintain stability in the surrounding rock and effectively absorb kinetic energy induced by dynamic hazards.</p>

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Performance Study of a Novel J Energy-Absorbing Bolt under Controlled Dynamic Loads

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Chang Wang,
  • Xingdong Zhao,
  • Qiankun Zhu,
  • Bibo Dai,
  • Shaolong Qin

摘要

A novel J energy-absorbing bolt (J-bolt) has been developed to resist dynamic loads produced by rockburst. First, a dynamic impact constitutive model of the J-bolt is established through laboratory experiments and theoretical analysis. Then, the J-bolt’s dynamic performance is simulated using numerical software at various impact energy levels, with different numbers of joints, and under repeated impacts based on experimental studies. Finally, an anchor support design scheme for the Hongtoushan copper mine, which is prone to rockburst, is formulated using the energy method. Three safety factors for displacement, load, and energy are proposed, and the support scheme’s safety is verified using field monitoring data. The results show that as follows: (1) The J-bolt can resist impacts with energies above 19.03 kJ. At this stage, the J-bolt’s deformation has passed through three stages: elastic deformation, plastic deformation, and elastic deformation rebound. (2) The J-bolt’s deformation displacement increases with increasing joint numbers. The J-bolt’s stress and strain values reach maxima at the joints. (3) The J-bolt can withstand two impacts with energy of 19.0 kJ, and the accumulated energy absorption capacity of the J-bolt exceeds 38.06 kJ. On a third impact, fracture damage occurs in the J-bolt, and the stress and strain changes in the J-bolt differ from the results of the previous impacts. These results can also be used as criteria to identify the damage occurring in the J-bolt. (4) The three safety coefficients for displacement, load, and energy all exceed 1.5, indicating that the proposed J-bolt support scheme can maintain stability in the surrounding rock and effectively absorb kinetic energy induced by dynamic hazards.