乐滩水电站坝址工程地质

Dam Site Of Letan Hydropower Station Engineering Geological Condition

通过对乐滩水电站坝址勘察及施工开挖揭露分析，坝址处于区域构造相对稳定区，厂坝基为弱风化一微风化岩体，允许承载力满足建筑物的应力要求；坝基抗滑稳定主要受混凝土与建基面岩体抗剪（断）强度控制，对少数坝块地基存在的较长软弱缓倾角结构面，已进行加固处理；坝基渗漏以岩溶裂隙性渗漏为主，局部有串珠状小溶洞渗漏，建议进行防渗帷幕处理是必要的。

Through the investigation for the dam site of Letan Hydropower station and disclosure analysis for construction and excavation, the dam site is located in a region with relative stable structure, the foundation of the dam is weakly and slightly rock mass, allowing the carrying capacity meets the requirements of the stress of building. Anti-slide stability of dam foundation is mainly controlled by shearing strength between concrete and dam foundation rock, reinforced treatment has been done for the surface of longer and weakly and slow-obliquity, existed on a few dam-foundation; clam-foundation seepage is mainly of grike seepage , and there is little cave like a string of beads in the local area, suggesting that it is necessary to carry out grouting gallery.