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青溪水电站位于广东北部汀江中游,装机容量14.4万kW,电站水库集雨面积9千多km~2.为维持全年施工,上下游均采用土石混合过水围堰.围堰建在砂卵石复盖层上,均不清基,用高压喷射灌注水泥浆的方法穿透复盖层.构成防渗体.复盖层的主要成分为粗中砂.合砾率最大值21.9～34.4%,平均值7.2～18.8%.砾石中粒径2～8cm的占27.3～29.7%,并且有大至1.2m的孤石,渗透系数高达189.5～470m/d.
Qingxi Hydropower Station is located in the middle reaches of Tingjiang River in northern Guangdong with an installed capacity of 144,000kW and rainwater catchment area of more than 9,000 km2 in power stations. To maintain the whole year’s construction, Pebble overlay, are not clear base, with high pressure jet grouting method of penetration through the cover. Constitute impermeable body. The main component of the cover layer of coarse sand. Gravel rate of 21.9 to 34.4% , With an average of 7.2-18.8%, and gravel with a diameter of 2-8cm accounted for 27.3- 29.7%, with boulders as large as 1.2m with a permeability coefficient of 189.5-470m / d.