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现代矿业 ›› 2024, Vol. 40 ›› Issue (03): 67-70.
针对某矿区溜井平台边坡预裂爆破工况，通过理论分析和结合现场实际情况，确定了 合理的预裂爆破孔网参数范围、装药结构以及起爆延期时间等参数，并通过LS-DYNA数值模拟软件 建立双炮孔预裂成缝模型并对边坡预裂爆破过程进行仿真分析。通过对多组模型成缝效果对比分 析发现，确定孔径120 mm、孔距1.5 m进行预裂爆破综合效果最好，有利于边坡成形。现场爆破应用 得出，预裂边坡壁面平整，半孔痕迹清晰，孔痕连续性完好，半孔率达 75 %左右，掌子面根部到达预裂 线位置，爆破效果良好，无需二次处理，证实了宽孔距大孔径边坡预裂爆破技术在控制边坡成形方面 效果良好，为类似工程提供了参考。
Aiming at the pre-cracking blasting condition of the slope of a chain-pass platform in a mining area，the reasonable parameters of the pre-cracking blasting network，charge structure and initia⁃ tion delay time were confirmed through theoretical analysis and combined with the actual situation on site. The two-hole pre-cracking crack model was established by LS-DYNA numerical simulation software and the process of the slope pre-cracking was simulated. Through the comparative analysis of the joint forming effect of several groups of models，it is found that the comprehensive effect of pre-cracking blasting with ap⁃ erture 120 mm and hole distance 1.5 m is the best，which is conducive to slope forming. Field blasting appli⁃ cation shows that the pre-cracking slope wall surface is smooth，the half-hole marks are clear，the continu⁃ ity of the hole marks is intact，the half-hole rate is about 75%，and the root of the palm surface reaches the pre-crackingt line. The blasting effect is good without secondary treatment，which proves that the pre-crack⁃ ing blasting technology of wide hole distance and large aperture slope has good effect in controlling slope forming，and provides a reference for similar projects.
摘要： 针对某矿区溜井平台边坡预裂爆破工况，通过理论分析和结合现场实际情况，确定了 合理的预裂爆破孔网参数范围、装药结构以及起爆延期时间等参数，并通过LS-DYNA数值模拟软件 建立双炮孔预裂成缝模型并对边坡预裂爆破过程进行仿真分析。通过对多组模型成缝效果对比分 析发现，确定孔径120 mm、孔距1.5 m进行预裂爆破综合效果最好，有利于边坡成形。现场爆破应用 得出，预裂边坡壁面平整，半孔痕迹清晰，孔痕连续性完好，半孔率达 75 %左右，掌子面根部到达预裂 线位置，爆破效果良好，无需二次处理，证实了宽孔距大孔径边坡预裂爆破技术在控制边坡成形方面 效果良好，为类似工程提供了参考。
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