强岩溶区水库大坝选型设计研究及实践

Research and Practice on Type Selection Design of Reservoir Dam in Strong Karst Area

笔者以德厚水库为例,介绍强岩溶区水库大坝选型设计。德厚水库是一座建设于岩溶区的大型水利工程,坝址两岸原始地形陡峻,岸坡基岩出露,主要地层为石炭系灰岩,岩溶强烈发育,坝基存在的深层软弱结构面对坝型选择起到主要控制作用,两岸溶蚀倒坡及坝基大量发育的溶隙、溶洞等缺陷对基础处理造成较大影响。通过对前期设计坝型的综合比选及施工中的实践进行研究,提出一些思考及建议以供类似工程设计借鉴。

Taking the Dehou reservoir as an example,the authors introduce the selection and design of reservoir dam in strong karst area.Dehou Reservoir is a large-scale water conservancy project built in karst area.The original terrain on both sides of the dam site is steep and the bedrock on the bank slope is exposed.The main stratum is Carboniferous limestone.The karst is strongly developed.The deep weak structural plane of the dam foundation plays a major role in controlling the selection of dam type.Defects such as corrosion slopes on both sides and the large number of dissolutions and karst caves in dam foundation have a great impact on foundation treatment.Through the comprehensive comparison and selection of dam types in the early stage of design and the practice in construction,some thoughts and suggestions are put forward for reference in similar engineering designs.