The foundation of Xixiayuan powerhouse belongs to Tertiary soft rock.In order to prevent destruction by percolation, it builds a suspended impervious curtain in the foundation.

• 摘要西霞院电站厂房地基为第三系软岩，为防止电站坝段的渗透破坏，厂房地基设悬挂式防渗帷幕；