密平路石方路堑开挖控制爆破

采用了浅孔和中深孔爆破相结合的台阶开挖方法。按照谨慎爆破方法确定合理的爆破参数。应用孔内和排间微差起爆方式控制爆破震动。为确保边坡的稳定 ,采用了光面爆破技术以及V形延时起爆和路堑中央炮孔先起爆的两种起爆顺序。根据具体的地形条件 ,选择或创造合适的最小抵抗线方向 ,避免飞石的危害。

CONTROLLED BLASTING FOR EXCAVATION OF MIPING HIGHWAY ROCK CUTTING

The bench excavation of combining short-hole with deep-hole blasts was adopted.The reasonable blasting parameters were determined on the basis of caution blasting method.The initiation mode with hole-inner and row-to-row short-delay was used to control blasting vibration.In order to ensure slope stability,the smooth blasting technology and two firing sequences,i.e.V-shape initiation and first initiation of blastholes in cutting center,were applied.To avoid the hazard of flying rocks,the most suitable direction of burden were selected or created according to concrete topographical conditions.