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土石混合围堰由黏土和碎石为主构筑的围堰称为混合围堰。这种围堰适用于施工期较长的大,中型水利工程。土石混合围堰在拆除时需要用较大型的挖掘机械和专用的水平挖掘机械
expl. earth and stone cofferdam

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