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<p>To study the rock’s damage characteristics near the blast-hole in high slopes and throwing trajectory under blasting load, a numerical model of the high slope throwing blasting rock was established by using the HJC fracture damage evolution model (Holmquist–Johnson–Cook) combined with ANSYS/LS-DYNA. Based on the slope blasting simulation results, the rock’s fracture damage range and the fracture and crack zones’ radii are determined. Meanwhile, the correlation between the fracture damage range, the rock’s damage degree near the blast-hole and the distance from the center of explosion, particle peak vibration velocity, compressive strength as well as dynamic tensile strength is investigated. Based on the above, three methods are put forward to determine the damage PPV threshold of the near-field rock, that is, <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10706_2025_3241_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="23" /> </InlineMediaObject> <EquationSource Format="TEX">\(v_{pp}^{ * }\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mi>v</mi> <mrow> <mi mathvariant="italic">pp</mi> </mrow> <mrow> <mrow /> <mo>∗</mo> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation> can be obtained by the maximum tensile stress criterion, by establishing a statistical correlation between the peak tensile stress and PPV, and by the rock’s damage degree (<i>D</i> = 0.19). By controlling the blast-hole charge’s uncoupled charging coefficient, the rock’s damage range near the blast-hole, as well as the functional relationship between the explosion center distance and the damage degree near the blast-hole under the condition of 4 kinds of uncoupled coefficient are determined.</p>

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Fracture Damage Analysis of Rock Near Blastholes in High-Slope Throw Blasting

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Fangxia Qi,
  • Wenhai Zhou,
  • Juan Bao,
  • Xiaoming Lou,
  • Caizhi Hu,
  • Rui Liang

摘要

To study the rock’s damage characteristics near the blast-hole in high slopes and throwing trajectory under blasting load, a numerical model of the high slope throwing blasting rock was established by using the HJC fracture damage evolution model (Holmquist–Johnson–Cook) combined with ANSYS/LS-DYNA. Based on the slope blasting simulation results, the rock’s fracture damage range and the fracture and crack zones’ radii are determined. Meanwhile, the correlation between the fracture damage range, the rock’s damage degree near the blast-hole and the distance from the center of explosion, particle peak vibration velocity, compressive strength as well as dynamic tensile strength is investigated. Based on the above, three methods are put forward to determine the damage PPV threshold of the near-field rock, that is, \(v_{pp}^{ * }\) v pp ∗ can be obtained by the maximum tensile stress criterion, by establishing a statistical correlation between the peak tensile stress and PPV, and by the rock’s damage degree (D = 0.19). By controlling the blast-hole charge’s uncoupled charging coefficient, the rock’s damage range near the blast-hole, as well as the functional relationship between the explosion center distance and the damage degree near the blast-hole under the condition of 4 kinds of uncoupled coefficient are determined.