盘石头水库河槽段趾板基岩的地质概况与防渗设计分析

Geological Survey of Foundation Rock under Toe Board at the Reach of Riverbed in Panshitou Reservoir and Analysis on Design of Seepage Control Project

盘石头水库河槽段趾板基岩建基面下8m为相对不透水层,如按常规进入不透水层5m设计帷幕,深度只有13m左右,对100m高坝而言,深度偏浅,为安全考虑,帷幕设计为悬挂式帷幕,主帷幕深度按1/3坝高考虑,穿透隔水层,隔水层以上以一排主帷幕和两排副帷幕防渗,隔水层以下以一排主帷幕防渗。

8m thick under the layer of foundation rock under toe board at the reach ot riverbed in Panshihe Reservoir is relative impermeable layer . If the curtain is designed entering impermeable layer 5m deep according to conventional practice , the depth is only 13m or so . With regard to the dam 100m high , the depth is a little bit on the shallow side , for the sake of safe , the curtain is designed as suspended one , the depth of the primary curtain is designed 1/3 dam height , and the curtain penetrates the watertight layer. Above the layer , one row of primary curtain and two rows of secondary curtain are set up , and under the layer , one row of primary curtain is set up to control seepage.