岩滩水电站扩建工程进水口围堰设计

Intake Cofferdam Design for Yantan Hydropower Extension Project

岩滩水电站扩建工程进水口预留岩(土)坎围堰位于一期工程水库中,进水明渠底板高程低于水位正常蓄水位,降低水库水位来保证施工全过程的安全,则会对一期工程造成较大的电量损失。针对工程的实际情况,进行了进水口预留岩(土)坎围堰设计。文章介绍了进水口预留岩(土)坎围堰设计方案。该方案于2006年通过相关部门审查,扩建工程于2010年10月开工,进水口预留岩(土)坎围堰已通过了2011年枯水期和2012年洪水期的检验,进水口的开挖和混凝土浇筑顺利,说明进水口预留岩(土)坎围堰的设计方案是合理、可行的。

An intake cofferdam of reserved rock （soil） ridge, which locates at phase-I reservoir, is designed for Yan- tan hydropower extension project. The bottom elevation of the open intake channel is lower than the reservoir＇s normal pool level. Therefore, great power loss can be expected in phase-I project if the construction safety is ensured by de- creasing the reservoir level. The paper makes an introduction to the design scheme for the intake cofferdam of reserved rock （soil） ridge, which passed the examination of the related authorities in 2006. The extension project commenced in October 2010 and the cofferdam was tested safety by the dry period of 2011 and the wet period of 2012, during which the excavation and concrete pouring at the intake went smoothly, which showed that the design scheme is reasonable and feasible.