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基坑支护施工方案四 | 2011-2-15 12:10:00
现场安全资料实例（164）基坑支护施工方案四
基坑支护施工方案四
|
基坑支护施工方案 二、水文地质情况 本工程坑底位于③2层灰色淤泥质粉质粘土中，该层夹有薄层粉砂及透镜体。该土层含水量高，孔隙比大，土质相对不稳定。在浅层承压水作用下易产生流砂及涌土现象，其垂直向的渗透系数达10-4cm/s数量级，远大于④层土10-6cm/s数量级。④层的灰色淤泥质粘土层为高压缩性土，压缩系数，a01-02>0.5MPa-1，该土层可视为不透水层。 选择④层淤泥质粘土层作深层搅拌桩的止水帷幕，就可以有效切断地下水的渗透途径，同时在基坑内配合明排水，就可以有效防止坑底土体的隆起及涌土流砂现象。 |
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