江坪河水电站工程特点及关键技术研究综述

Summary on Engineering Characteristics and Key Technology Research of Jiangpinghe Hydropower Station

江坪河水电站坝址位于长约600 m的峡谷河段内,河谷呈"V"型,河谷狭窄、岸坡陡峻,宽高比1. 8,"漏斗状"地形;坝区地层岩性软弱不均、左右岸分布高程不对称;且位于喀斯特地区,水文地质条件复杂,存在河湾地块渗漏、岩溶管道系统等问题;水库为多年调节水库,发电下泄的水温与天然河水温相比冬季水温有所提高,而春、夏季水温低于天然河水温,对下游生态将产生不利影响。简要介绍对狭窄河谷高混凝土面板堆石坝变形控制、高水头大断面洞室泄洪系统、控制下泄低温水工程措施和喀斯特地区筑坝渗控措施等关键技术。

The dam site of Jiangpinghe Hydropower Station is located in a canyon section with a length of about 600 m. The canyon is V-shaped and narrow with steep bank slope, and the ratio of width to height is 1. 8. The lithology of dam area is weak and uneven, and the distribution elevation of left and right banks is asymmetric. The dam is located in karst area, the hydrogeological conditions are complex, and there are problems such as the leakage of river bay block and the karst pipeline system. The reservoir is a multi-year regulating reservoir, and the water temperature discharged by power generation is higher than the natural river water temperature in winter and lower than the natural river water in spring and summer, which will adversely affect downstream ecology. The key technologies such as the deformation control of high concrete face rockfill dam in narrow river valley, the cavern discharge system with high water head and large section, the engineering measures for controlling low temperature water discharge and the seepage control measures of dam construction in karst area are introduced herein.