汕头市苏埃通道大直径盾构海底隧道建设条件风险分析

Risk Evaluation of Under Sea Tunnel Excavation by Large Diameter TBM

汕头市苏埃通道工程作为重要的跨越市区内海湾通道工程,面临诸多建设条件风险。结合汕头市苏埃通道工程盾构工法设计与施工方案,辨识了盾构下穿海底隧道的不良工程地质和水文条件、工程建设方案及施工技术等存在的风险源,并对风险源致灾机理进行分析。利用风险指标评估与专家调查法,计算得到海域段盾构隧道建设条件定量风险评估等级,并对重大风险源提出了风险控制措施,对后续工程建设和运行安全风险控制具有参考和指导价值,对保障项目顺利建设有重要的作用。

As an important pass way underneath the inner harbor of unban Shantou area,the Su-Ai Pass Project processes many potential hazards induced by the tunnel construction excavated by the large diameter Tunnel Boring Machine（TBM）.Based on the project construction methods and sequences,the potential risks induced by the adverse engineering and hydrological geology conditions as well as construction techniques are identified.The risk levels of the shielded tunneling segment are quantified by using the risk level evaluation and expert system methods.The sources that might result in high risks are evaluated and the method of controlling these risks are also proposed.