岩溶发育石灰石矿山逐孔起爆技术试验研究

岩溶会导致爆破能量的泄漏，严重影响岩石的破碎和爆破效果，而相邻炮孔炸药可能因殉爆引起大面积的拒爆事故；采用逐孔起爆时，每个炮孔有3个及以上的自由面，有利于岩石抛掷，相邻两个药包不同时起爆，避免了应力降低区的出现；逐孔起爆技术的关键是高精度导爆管起爆系统、确定合理的孔间和排间微差时间，以及起爆网络的正确设计；在岩溶发育石灰石矿山进行的逐孔起爆试验结果表明，逐孔起爆技术能改善爆破效果，显著降低爆破震动效应，降低矿山生产综合成本，并有效预防大面积拒爆，提高矿山安全作业水平。

Test Research on the Blasting Ignition in Borehole Sequence in Karst Developed Limestone Quarry

Karst may lead to a leakage of blast energy, seriously affecting the rock fragmentation and blasting effect. Adjacent borehole explosion may cause a large area of misfire due to sympathetic detonation. In case of ignition in borehole sequence, each blast hole has three or more free faces, which will facilitate the rock throw-out and the ignition of adjacent blast holes at different times can avoid the occurrence of stress reduction area. The key of the technique of blasting ignition in borehole sequence lies in credible precision detonator system, rational millisecond between bore to bore and row to row and correct blasting network design. The test of ignition in borehole sequence carried out at a karst developed limestone quarry has proven that this technique can improve the blasting effect, evidently reduce the blasting caused vibration, decrease the comprehensive production cost of mine and effectively prevent a large area of misfire and improve the mine safe operation level.