控制爆破在清除高陡边坡危岩体中的应用

Application of Control Blasting in Removal of Dangerous Rock Mass in High and Steep Slope

西成高铁广元段赵家岩隧道出口,存在危岩,威胁安全。为此,针对高陡边坡危岩体所处的特殊复杂环境,采用爆破清除危岩。爆破前,采取混凝土填塞、锚杆支撑、防滚石挡墙等措施。同时采用不耦合装药、孔内延期和孔外延期结合等多种控制爆破技术措施,实施深孔控制爆破和浅孔控制爆破相结合,成功对危石进行了爆破清除。

There are dangerous rocks endangering the safety at the exit of Zhaojiayan Tunnel of Guangyuan Section of Xi＇an-Chengdu High-speed Railway. Therefore,aiming at the special and complicated environment of dangerous rock mass in high and steep slope,dangerous rocks are removed by blasting. Before blasting,measures like concrete filling, anchor support, anti-rolling stones retaining wall and so on are taken.Meanwhile,decoupling charge,in-blast hole delay,out-blast hole delay and several blasting control technical measures are adopted. As the implementation of hierarchical processing, deep hole controlled blasting combined with shallow hole controlled blasting,it is successfully blast and clear off dangerous rocks.