一、概述葛洲坝水利枢纽,是长江干流上的一座综合利用水利工程。座落在距长江三峡峡谷出口约三公里的莽莽大江上,建筑物巍峨壮观。坝区地层分布为白垩系下统红色碎屑岩。石门组为砾岩与粉砂岩互层,无粘土类夹层。五龙组的主要岩性是粘土质粉砂岩与砂岩互层,其中夹有44条软弱泥化夹层,这些夹层从大江、二江到三江一层接一层分布,似叠瓦状缓倾角平行排列,因而软弱夹层是本工程的主要工程地质问题。地下水主要分布在岩体的一些层面裂隙,缓倾角裂隙和高倾角张扭性裂隙中,透水性较微弱,相对隔水层埋藏不深,但某些地段也形成一定 First, an overview Gezhouba Dam, the Yangtze River is a comprehensive utilization of water conservancy projects. It is located on the vast river which is about three kilometers away from the Three Gorges Gorge of the Yangtze River. The buildings are magnificent and magnificent. The stratigraphic distribution of the dam area is the Cretaceous red clastic rocks. Shimen group of conglomerate and siltstone interbedded clay-free interlayer. The main lithology of the Wulong Formation is interbedded clay-siltstone and sandstone, in which there are 44 weakened mud-masking intercalations distributed one after another from the Dajiang River and the Erjiang River to the Sanjiang River, Arrangement, so the weak interlayer is the project’s main engineering geological problems. Groundwater is mainly distributed in some layers of rock mass fissures, gentle dip fissures and high dip angle torsional fissures, water permeability is relatively weak, the relative aquifuge is not buried deep, but some locations also form a certain