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针对预裂爆破中主炮孔爆破时双侧均存在自由面和抵抗线的情况,采用能量分析法,研究了条形药包等效子药包两侧炸药能量分布与相应抵抗线的相关性。结果表明,炮孔两侧等效线装药密度与同侧抵抗线大小成反比,即抵抗线越大,等效线装药密度越小。随后,推导出了炮孔两侧等效炸药单耗计算公式,并将该公式运用到台阶深孔预裂爆破参数优化中,得出了更合理的孔网参数和起爆方案,既保证了爆破效果,又保护了预裂边坡,为类似工程提供了有益参考和借鉴。
Aiming at the existence of free surface and resistance line on both sides during the blasting of the primary blasthole in the presplitting blasting, the energy analysis method was used to study the correlation between the energy distribution of the explosives on both sides of the equivalent bag and the corresponding resistance line . The results show that the charge density of the equivalent lines on both sides of the blast hole is inversely proportional to the size of the ipsilateral resistance line, that is, the greater the resistance line, the smaller the equivalent line charge density. Subsequently, the formula for calculating the unit-loss of equivalent explosives on both sides of the blasting hole was deduced, and the formula was applied to the parameter optimization of the pre-cracking blasting in the deep-hole of the step. The more reasonable parameters of the hole network and the detonation scheme were obtained, Effect, but also protect the pre-cracking slope, which provides a useful reference and reference for similar projects.