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一、前言葛洲坝水电工程二江地段布置有27孔泄水闸和7台发电机组。基岩为白垩系下统河流相碎屑岩.主要为紫红色粉砂岩、砂岩及其互层,并夹有较多的软弱夹层。喜山运动在本区先后形成了北东、北西西及北北西三个构造系统。然而二江岩层构造变形较轻微,为微倾南东,倾角4°～8°的平缓单斜地层。建筑地段原地面高程47～60米。根据建筑物结构和基础处理的要求,平均挖深30～40米,发电机窝最低挖至高程零米,挖深达54米,卸荷约11公斤/平
I. Introduction Gezhouba hydropower project two sections of the 27 holes arranged sluice gate and 7 sets of generating units. The bedrock is the Cretaceous lower fluvial clastic rocks, mainly consisting of mauve siltstone, sandstone and their interbedded layers, with more weak intercalations. Himalayan movement in the region have formed a north-east, north-west and north-northwest three structural systems. However, the structural deformation of the Erjiang rock strata is slight, with a gentle monoclinic formation with slight dip to the east and dip from 4 ° to 8 °. Construction site of the original ground elevation 47 ~ 60 meters. According to the requirements of the building structure and basic treatment, the average digging depth 30 ~ 40 meters, generator nest dug to the elevation of zero m, digging depth of 54 meters, unloading about 11 kg /