向家坝水电站施工导流规划与设计

针对向家坝水电站特殊的自然条件和工程布置特点,其施工导流经过对多个方案进行比较,从施工布置、后期度汛、施工期通航、发电工期等方面考虑,选择了第一期围左岸、第二期围右岸的分期导流方案。文中对该方案进行了简要介绍,并介绍了有关导流建筑物,以及二期纵向混凝土围堰堰基覆盖层采用了沉井群等综合处理方案和二期导流采用的底孔加缺口联合泄流方式。

Planning and design of construction diversion for Xiangjiaba Hydropower Station

In light of the special natural conditions and project layout characteristics of Xiangjiaba Hydropower Station,a stage diversion scheme with the left bank being closed at the first stage and the right bank closed at the second stage has been selected through comparison of several schemes under the consideration of the aspects such as construction layout,late-stage flood control,navigation during the construction,and the construction period before the commissioning of the first hydropower generating unit.The construction scheme is briefly introduced herein,and furthermore,the diversion structures,the composite scheme consisting of open caisson group adopted to treat the overburden of the foundation for the Stage 2 longitudinal concrete cofferdam and the diversion method of bottom outlet combined with the dam gap used for the Stage 2 diversion are described as well.