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Shield Break-in in Water Construction Technology of Shanghai Yangtze River Tunnel Construction
Pages: 33-37,69
Year: Issue:  2
Journal: Underground Engineering and Tunnels

Keyword:  长江隧道 泥水平衡盾构 工作井 水中进洞 地基加固 注浆;
Abstract: 上海长江隧道工程盾构水中进洞段的覆土最薄处为6.187m,属于超薄覆土盾构施工,给地面沉降控制增加了难度,同时极有可能出现隧道"上浮"现象;由于正面压力的减少,易造成管片之间的松动。介绍了该隧道工程所采用的盾构水中进洞的过程,分析并探索了为防止地下水进入工作井,采用井点降水、水中进洞以及洞门封堵等保证盾构进洞安全的技术措施。
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