水撼法地基加固技术就是在处理软土地基时,清除软基置换砂石垫层,并且使用水撼法施工的一种技术。´Ì
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施工要点:´Ì
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a) 施工前应验槽,清除基底淤泥及软弱粘土层,两侧应留有一定坡度´Ì
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;b) 垫层底面宜铺设在同一标高上,深度不同时应按先深后浅的顺序施工,土层应挖成踏步或斜坡搭接;分层铺设时,接头应作阶梯形搭接,每层错开50~100cm ,并充分捣实;´Ì
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c) 人工级配砂石,应先拌和均匀再铺填、捣实,每层铺设厚度25cm;´Ì
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d) 注水高度略超过铺设面层,并有控制地注水和排水;´Ì
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e) 使用插入式振捣器或钢叉摇撼捣实;´Ì
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f) 为防止基底底面的表层软土发生局部破坏,应在基坑底部及四侧先铺一层砂,然后再铺砂石垫层;´Ì
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g) 每铺好一层垫层,经密实度检查合格后,方可进行下一道工序施工。´Ì
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