控制灌浆技术在土石围堰防渗处理中的应用

Application of controlled grouting to anti-seepage of earth-rockfill cofferdam

土石围堰自身空隙较大、架空现象严重,导致土石围堰两侧的水位相差无几,致使导流明渠、大坝与厂房基坑开挖、浇筑无法正常进行,严重制约着工程防洪度汛及施工工期。对土石围堰如何进行防渗处理,结合索风营水电站土石围堰成功的防渗处理工程实例,较全面地探讨了土石围堰防渗处理技术。

As the dumped earth-rockfill cofferdam is quite porous, there is little difference for the water levels on both the sides of the cofferdam, which will influence the excavations of the diversion channel and the foundation pits for both the dam and the power house and the concrete placement, and then restrict the construction progress of the project concerned as well. In combination with the successful case of the anti-seepage construction for the cofferdam of Suofengying Hydropower Station, the anti-seepage technique for such an earth-rockfill cofferdam is discussed in detail herein.