Abstract: Steep dip thin limestone and granodiorite alteration zone were developed as the foundation of underground powerhouse at Langyashan pumped storage power station. The alteration zones distributed randomly and argillation as well as disintegration would occur as contact of water. Aiming at heterogeneous rock foundation with limestone and granodiorite alteration zone, the method of whole rigidity box structure was adopted to solve the problem of insufficient carrying capacity and uneven settlement of the foundation. The result showed that it was of good effect and worthy reference.

Key words: foundation treatment, alteration zones, underground powerhouse, Langyashan pumped storage power station

摘要： 琅琊山抽水蓄能电站地下厂房地基陡倾角薄层灰岩与花岗闪长蚀变岩带相间发育，其中蚀变岩带随机分布，遇水崩解泥化，强度较低。针对灰岩与蚀变岩相间的不均一岩性地基，采用整体刚性箱型基础结构，成功解决了地下厂房基础承载能力和不均匀沉降变形问题，为机组长期安全稳定运行奠定了基础，取得了良好的经济效益和社会效益。

关键词: 基础处理, 蚀变岩, 地下厂房, 琅琊山抽水蓄能电站