基于小孤山水电站工程的地形和地质条件,阐述了小孤山水电站采用地下厂房方案的原因及地下厂房布置原则,确定了地下厂房的位置、纵轴线方向和厂区枢纽的总体布置。实例结果表明,该工程总体布置紧凑,且兼顾施工运行,既缩短了施工工期,又节约了工程投资,为西北干旱半干旱地区地下式发电厂房的设计提供借鉴。 Based on the topography and geological conditions of Xiaogushan Hydropower Station project, the reasons why underground powerhouse scheme was adopted and the principle of underground powerhouse layout were discussed, and the location of the underground powerhouse, the direction of the longitudinal axis and the general layout of the plant hub were determined. The results of the example show that the overall layout of the project is compact and takes into account the construction operation, which not only shortens the construction period but also saves the project investment, so as to provide references for the design of underground powerhouse in arid and semi-arid regions of Northwest China.