上尖坡水电站导流洞封堵施工技术

Construction Technology of Diversion Tunnel Plugging of Shangjianpo Hydropower Station

上尖坡水电站右岸导流洞断面尺寸为5.2 m×6 m,封堵长度为20 m,由于导流洞封堵段上游0+50 m～0+79 m区间为溶洞溶槽地质,地质条件为泥夹石充填物,同时受右坝肩滑坡地质灾害等诸多因素的影响,稳定性极差。导流洞大部分洞身段都在地下水位以下,加之导流洞运行时间长达3年之久,对于封堵段混凝土施工必须采取各种优化措施,加快施工进度。笔者就导流洞封堵施工措施、工艺等进行全面介绍。

The section size of the diversion tunnel on the right bank of Shangjianpo Hydropower Station is 5.2m×6m and the plugging length is 20m.Because the upstream 0+50m^0+79m section of the plugging section of the diversion tunnel is karst cave and karst groove geology,the geologic condition is mud-rock filling,and affected by many factors such as landslide on the right abutment,the stability is extremely poor.Most of the diversion tunnels are below the groundwater level,and the operation time of the diversion tunnels is as long as three years.For the concrete construction of the plugging section,various optimization measures must be taken to speed up the construction progress.The author gives a comprehensive introduction to the construction measures and technology of diversion tunnel plugging.