甑子岩特大型危岩体治理开挖控制爆破

甑子岩特大型危岩体治理削方量大、施工周期长、环境复杂,治理施工过程中,通过合理的布置爆破区域及采取安全控制措施,有效地降低了爆破施工对危岩体稳定性的影响,保障了施工过程的安全。采用导爆管雷管孔内、外接力传爆的逐孔顺序微差起爆方法及预裂爆破技术,获得了较为平整的开挖坡面,半孔率高,整体爆破效果好。施工过程中按特定爆心距处危岩体表面测点爆破振动速度作为稳定性监测的控制标准,可有效降低爆破对母岩体及危岩体的振动影响,符合危岩体快速治理及振动控制的要求,有利于规范爆破施工过程控制。

Controlled Explosive Excavation of Zengziyan Oversize Dangerous Rock Mass

The cutting amounts of Zengziyan oversize dangerous rock mass is large,the construction duration is long and the environment is complex.During the construction process,proper blasting zone and reasonable safety con-trol measures were adopted to effectively reduce the effect of blasting on the stability of rock body.The hole-by-hole millisecond delay blasting method with detonators relay explosion from inside of hole to outside,and pre-splitting blasting technology were used,finally a relatively smooth excavation slope surface was obtained,where the half-hole rate was high and the overall blasting effect was good.In the construction process,the velocity of blasting vibration of the surface dangerous rock mass with certain distance to blasting center,was used as the control standard for stability monitoring to effectively reduce the influence of blasting vibration on parent rock and dangerous rock mass,which met the requirement of rapid control and vibration control of dangerous rock mass,and helped to regulate blasting con-struction process control.