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紫坪铺水电站原设计坝型为混凝土重力坝,水头67米(相应坝高为93米)。坝址位于龙门山地槽东南边缘山前凹陷带,出露岩层主要为下侏罗纪煤系砂页岩互层,属于复理式沉积,岩性很不稳定,褶皱很剧烈,形成许多由东北至西南方向延伸、并向东南倒转的短轴背斜和向斜(?)。坝址区岩层的基本走向为北30度～75度东,倾向北
Zipingpu hydropower station originally designed for the concrete gravity dam dam, head 67 meters (the corresponding height of 93 meters). The dam site is located in the piedmont sag zone at the southeast margin of the Longmenshan gnarder. The exposed rock strata are mainly interbedded with the lower Jurassic coal measures of sand shale, belonging to complex-type sediments. The lithology is unstable and the folds are very violent, resulting in many formations from northeast to southwest Direction and extended to the southeast of the minor axis anticline and syncline (?). The basic trend of the dam formation in the dam site is north 30 degrees to 75 degrees east, with a tendency of north