公伯峡水电站溢洪道开挖施工的技术控制

Technical control of the excavation of spillway for the Gongboxia Hydropower Station

公伯峡水电站溢洪道地质条件复杂多变、断层带和破碎带随处可见且难以寻找其规律,加之交叉作业的干扰,给开挖带来了很大困难。在施工中,重视过程控制,精心组织,科学管理,优化方案,预裂孔角度采用吊线法控制,边坡及建基面保护层均采用预裂爆破,爆破参数根据现场试验及时进行调整,取得了较好的效果。

The geological conditions of the spillway of Gongboxia Hydropower Station are complex and changeable and the faults and crushed zones in this area appear everywhere and non logical.Due to the disturbance of cross working process, it is difficult to excavate. In the construction, we paid great attention to the process control, scientific management and optimization. The angle of pre split hole was controlled by the plumb line method and the pre split blasting was used to the excavation of side slope and construction foundation surface. The blasting parameters were adjusted timely according to the field tests so that good effectiveness has been gained.