思林水电站截流工程施工监理

贵州乌江思林水电站采用单洞截流、双洞度汛、土石围堰过水的导流方式。由于受右岸尾水隧洞出口高程的控制，右岸导流洞进水口高程较高，进水口分流高程与河床底部高差达35m，分流效果较差，致使截流工程难度大；而喀斯特地区地形及地质条件复杂，工程工期紧、任务重，围堰工程闭气灌浆采用了多种灌浆方法。中国水利水电建设工程咨询昆明公司思林电站监理部采取了针对性较强的措施，与参建各方共同努力，使截流及围堰闭气灌浆在3个月内顺利完成。

Construction supervision of closure works of Silin Hydropower Station

The diversion method was river closure using single tunnel, flood period using double tunnels and overflowing earth-rock cofferdam in Gulzhou Wujiang Silin Hydropower Station. Because tailrace tunnel outlet elevation on the right bank is high, the inlet elevation of diversion tunnel on the right bank is rather high. The height difference reach to 35 meters between the inlet elevation and the rive bed elevation. It＇s bad of diversion effect, resulting in difficulty for river closure. Many grouting methods for dead-air grouting of cofferdam were adopted, because complicated topographic and geologic conditions in karst region, short construction period and heavy tasks. Taken the powerful measures for it and made joint efforts with every construction companies, the engineering of river closure and dead-air grouting of cofferdam was completed successfully in three months.