溪洛渡水电站谷幅变形成因与形成条件

基于溪洛渡水电站地质环境,从水库蓄水引起的区域水文地质条件变化入手分析溪洛渡水电站谷幅变形的成因、研究谷幅变形的形成条件。结果表明:溪洛渡水电站水库蓄水引起的谷幅、库盘变形与电站位于永盛向斜盆地内、坝基玄武岩层下埋藏有厚层阳新灰岩承压含水层有关,谷幅、库盘变形规律与库区区域地质、水文地质条件和水库蓄水位、水库蓄水过程等密切相关;库盘变形、谷幅变形属于一种特殊的库岸变形。

Impact factors and forming conditions of valley deformation of Xiluodu Hydropower Station

This study analyzes the causes and forming conditions of valley deformation based on the geological environment of Xiluodu hydropower station and the evolution of regional hydrogeological conditions induced by the impoundment. It reveals that the foundation and valley deformation are related to facts that the dam is located within the Yongsheng synclinal basin and the basalt layer consisting of the dam foundation situates above a thick confined aquifer consisting of Yangxin limestone. The patterns of valley and foundation deformation are closely related to the regional geological conditions, hydrogeological conditions and the reservoir impoundment process, etc. On such basis, internal and external factors of foundation and valley deformation are revealed. At the same time, it has been pointed out that the foundation and valley deformation belong to a special bank deformation. At last, definitions and classification of two deformation types are provided.