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<p>To better understand rockburst prevention through borehole pressure relief, a comprehensive experimental study was conducted on granite specimens. During testing, a modified true-triaxial loading method, in which five faces were under compressive stress while one face remained unconfined, was applied to the specimens to simulate the strain rockburst. Each rock specimen (100 mm (length) × 100 mm (width) × 200 mm (height)) has four cylindrical holes with a diameter of 10 mm. Different rock specimens have holes drilled to varying depths: 10, 25, 50, and 75 mm, allowing for a comprehensive comparison of the impact of borehole depth on performance. The results reveal that borehole pressure relief reduces rock strength and decreases pre-peak elastic strain energy accumulation, leading to a reduction effect on the rockburst intensity. The reduction effect on rockburst intensity will vary when different borehole depths are encountered. Boreholes shallower than 25 mm exhibit a negligible impact, and the effect becomes significant at a depth of 50&#xa0;mm. With an increase in the borehole depth, both tensile fractures near the free face and shear fractures away from the free face decrease, and AE analysis further demonstrates that the failure characteristics of the specimens change from the mixed tensile–shear to the tensile-dominated failure mode. For optimal rockburst prevention in practical applications, pressure-relief boreholes should extend to the shear failure zone of the surrounding rock mass with a minimum depth of twice the rockburst pit depth.</p>

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Depth-Dependent Effectiveness of Borehole Pressure Relief in Rockburst Prevention: An Experimental Investigation

  • 期刊论文

  • 发表日期：

    2026年4月4日

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  • Jianqing Jiang,
  • Junjie Wen,
  • Tianhan Nong,
  • Shihong Hu,
  • Ben-Guo He,
  • Wenjing Niu

摘要

To better understand rockburst prevention through borehole pressure relief, a comprehensive experimental study was conducted on granite specimens. During testing, a modified true-triaxial loading method, in which five faces were under compressive stress while one face remained unconfined, was applied to the specimens to simulate the strain rockburst. Each rock specimen (100 mm (length) × 100 mm (width) × 200 mm (height)) has four cylindrical holes with a diameter of 10 mm. Different rock specimens have holes drilled to varying depths: 10, 25, 50, and 75 mm, allowing for a comprehensive comparison of the impact of borehole depth on performance. The results reveal that borehole pressure relief reduces rock strength and decreases pre-peak elastic strain energy accumulation, leading to a reduction effect on the rockburst intensity. The reduction effect on rockburst intensity will vary when different borehole depths are encountered. Boreholes shallower than 25 mm exhibit a negligible impact, and the effect becomes significant at a depth of 50 mm. With an increase in the borehole depth, both tensile fractures near the free face and shear fractures away from the free face decrease, and AE analysis further demonstrates that the failure characteristics of the specimens change from the mixed tensile–shear to the tensile-dominated failure mode. For optimal rockburst prevention in practical applications, pressure-relief boreholes should extend to the shear failure zone of the surrounding rock mass with a minimum depth of twice the rockburst pit depth.