单孔单响微差起爆技术在路堑开挖中的应用

Application of Millisecond Blasting Method for Single Hole Blasting of Once Each Time Point in Cutting Excavation

溪洛渡电站3#公路路堑开挖中,由于其紧邻爆区一侧有一道需重点保护的防渗墙,根据防渗墙保护要求和周围环境,应用单孔单响大区微差接力起爆技术,并通过选择合理的孔网参数、微差时间和堵塞长度等措施,并在防渗墙上布置振动监测点,根据爆后效果观察和监测点的振动测试数据来看,采用该方法能够达到降低爆破地震、控制飞石的效果,保证了工程进度和施工质量。

To protect a cutoff wall closing to excavation region during the course of excavating 3^# road on Xiluodu hydroelectric station ; according to surroundings and vibration requirements, the method of reasonable hole parametem millisecond times stem length and single hole blasting of once each time applied in cutting excavation is adopted. Bhsting effect and monitoring data show it is effective in reducing vibration by way of the technology.