深孔预裂爆破在溢洪道高边坡开挖的应用

Application of Deep Hole Pre-splitting Blasting Technology to Spillway's High Slope Excavation

高边坡深孔预裂爆破是一项对施工质量、安全要求极高的爆破技术,必须进行科学的爆破技术设计,确定合理的爆破参数;高度重视爆破钻孔工艺、装药工艺、网络工艺以及边坡稳定性地质分析。在洞巴水电站中不允许采用超欠平衡的开挖方法进行施工,利用设计台阶高度,采用深孔预裂爆破对溢洪道高边坡的稳定及开挖平整度进行有效控制,取得良好效果。

High slope deep hole pre-splitting blasting technology has strict requirements on engineering quality and safety,which claims scientific design of blasting technology and rational selection of blasting parameters.Importance shall be attached to drilling technique;charging technique,network technique and geological analysis on side slope stability in blasting.Super under-balance excavation is not allowed in the construction of Dongba Hydropower Station.By taking advantage of designed step height,deep hole pre-splitting blasting is applied to control the stability of spillway＇s high slope and the smoothness of excavation,which has made success.