小断面马蹄形和圆形洞室开挖技术在狮子坪水电站的应用

Tunneling technique for small section tunnel with horseshoe shaped and circular shaped sections in Shiziping Hydropower Station

在狮子坪水电站引水隧洞CV标洞室开挖中,采用超前探孔、分层开挖和超前注浆管棚支护方法,并对不良地质洞段采用“短进尺、弱爆破、勤观测、强支护”施工工艺,加快了工程进度,为工程顺利施工奠定了良好的基础。

During the excavation of the CV section of the diversion tunnel for Shiziping Hydropower Station, the construction methods of pilot drilling, excavation in layers and pilot grouting with pipe-shed supporting are adopted with the technologies of “short footage, weak blasting, frequent observation and strengthened supporting”, which speed up the construction and make a good basis for the construction of the project as well.