葛洲坝工程地基岩体为白垩系下统红色碎屑岩地层。其中以泥质粉砂岩为主体,并夹有较多的软弱夹层和泥化夹层。地层产状平缓,倾角4—8度。在地质构造作用下,曾受到过三次轻微的构造变动。构造破坏主要表现为沿软弱夹层产生剪切错动和产生小规模 Gezhouba Project foundation rock mass is the Cretaceous Lower Red Clastic Formation. Among them, argillaceous siltstone is the main body, and there are more weak sandwiches and muddy sandwiches. The formation is gentle, with an inclination of 4-8 degrees. Under the geological structure, there have been three minor structural changes. The tectonic damage is mainly manifested in the shear displacement along the weak intercalation and the generation of small scale