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软土基坑施工对盾构隧道的影响分析

Qiang Bi,Dongming Cai,Xiaoli Yao

Municipal Engineering Technology（2016）

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Abstract
采用三维数值计算方法,分析了软土地区基坑开挖对坑底已建隧道的影响.计算结果表明:应先对坑底已建隧道地基加固,后放坡开挖,且在放坡开挖时需要进行分区、分块,对基坑内部土体也要分层、分块开挖;基坑内分段开挖的长度不宜大于10m;施工时的旋喷压力控制在20 MPa以内;钻孔灌注桩的嵌固深度应不小于10m.
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