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某水库围堰堰基覆盖层为砂卵砾石层,厚7~13 m,为冲洪积砂卵砾石层,成份主要为砂卵砾石、漂石及崩塌块石等,砂卵砾石层渗透系数K=10~(-1)~10~(-2)cm/s,强风化基岩吕荣值大于15 Lu。常规防渗型式如黏土心墙、高喷防渗墙等难以满足工程防渗要求,设计采用帷幕灌浆作为堰基防渗取得了较好的效果,可供其它类似工程借鉴。
The foundation cofferdam of a reservoir cofferdam is a sand-gravel layer with a thickness of 7 ~ 13 m, which is a gravel layer of alluvial sand, with the main components of sand, gravel, boulders and collapsed blocks, and the permeability coefficient K = 10 ~ (-1) ~ 10 ~ (-2) cm / s, the value of Lürong value of strong weathered bedrock is more than 15 Lu. Conventional seepage-proof types such as clay core wall and high-jet seepage prevention wall are difficult to meet the seepage prevention requirements of projects. Designing curtain grouting as weir foundation seepage prevention has achieved good results and can be used for reference to other similar projects.