金安桥水电站枢纽布置研究

Study on the Project Layout of Jin'anqiao Hydropower Station

金安桥水电站坝址地质条件复杂,坝基分布有4层凝灰岩,河床坝基主要为裂面绿泥化岩体,节理裂隙发育;左岸还分布有B1、B2、B3三个崩坍堆积体,对枢纽布置影响较大。通过研究比选,最终确定了碾压混凝土重力坝、右岸溢洪道、河中坝后厂房枢纽布置方案。该方案充分利用了河道的有利地形条件,合理解决了不利地质条件对枢纽布置的影响问题,同时充分考虑了水文泥沙条件、装机规模及向下游供水等因素对枢纽的要求,主要水工建筑物布置较为合理。

The geological conditions on the dam site of Jin＇anqiao Hydropower Station are complex. The dam foundation is distributed with four layers of volcanic tuff, and the riverbed base rock is mainly the fracture chloritization rock with developed joint fissures. Three slump taluses of B1, B2 and B3 arc also distributed at the left bank, which have a great impact on the arrangement of project. After alternatives comparison, the layout scheme of RCC gravity dam, right bankarranged spillway and powerhouse at dam toe was determined. The impact of disadvantageous geological conditions on project layout was eliminated by full using the favorable topographical condition of river channel, and at the same time, the requirements on the layout caused by the hydrological and sediment conditions, installed capacity and water supply to downstream were considered. The practice shows that the general layout is reasonable.