光面爆破技术在某水电站引水隧洞开挖中的应用

Application of Smooth Blasting Technology in Excavating the Diversion Tunnel of a Certain Hydroelectric Station

对某电站引水隧洞采用超前导洞与光面爆破相结合的方式开挖,取得了不平整度在10cm以下,超(欠)挖量在15cm以下的效果。介绍了光面爆破参数的选择、炮孔布置、所采用的掏槽形式及施工管理。

The diversion tunnel of a certain hydroelectric power station has been excavated by way of pilot heading combined with smooth blasting, therefore the results were achieved that the unevenness of the excavated surface is less than 10 cm and the overbreak or underbreak of the tunnel is less than 15 cm. This paper describes the determination of smooth blasting parameters, adopted blast-hole layout and cut-hole pattern as well as the construction control.