苏只水电站坝基工程地质条件及其地基工程处理

苏只水电站主要建筑物地基岩体均为新第三系上新统临夏组（N2I）粉砂质粘土岩、粘土岩及少量粘土质粉砂岩和含砾砂岩、细砂岩夹层，均属上新统软岩。施工过程中采取了控制爆破、预留保护层、人工清挖、建基面形成后迅速喷（浇）混凝土等一系列措施，满足了厂房坝段和泄水闸坝段红层软岩建基岩体完整、无大的损伤和天然含水状态，保证了控制大坝设计的关键岩体力学参数不致降低，为建筑物安全运行奠定了基础。

Engineering geological conditions and foundation treatment for Suzhi hydropower project

The foundations of Suzhi project structures are composed of the new Tertiary System Linxia Group （N21） silty clay, clay rock, few clayey and gravelly sihstones, fine sandstone interbeds, all belonging to the Pliocene Series soft rocks. During construction, measures such as controlled blasting, reserved protection layers, manual excavation and rapid shotcreting on formed foundation surface were taken so that the foundation of red soft rock beds at the powerhouse dam section and the sluice sections were kept intact, the natural water- bearing state unchanged and the key rock mechanics parameters controlling dam design not reduced, thus laying a solid foundation for safe operation of the structures.