超大直径盾构水中进洞风险分析

Risk Analysis on Arriving into Shaft of Super Large Diameter Shield Machine under Water

盾构进洞是盾构施工的一道关键收尾工作,也是极易出现风险问题的阶段。上海长江隧道采用水中进洞方案,技术新颖但风险性大,依照上海长江隧道提供的进洞施工方案,采用模糊层次分析法及专家信心指数法,对其进行风险分析,确定了进洞施工过程中的风险点及其权重,并基于风险分析的结果提出了相应的风险规避措施。

Shield tunnel is developing towards large diameter which brings more risks during reception of shield.The reception of shield is very important in tunneling.Based on the engineering project of Yangtze River Tunnel in Shanghai,the author analyses all kinds of risks we may meet during the construction by Fuzzy AHP and confidence index and provides corresponding strategies to avoid the risks by studying the critical construction steps of the reception of shield.