复杂地层越江隧道联络通道冻结施工风险分析

盾构隧道联络通道江中段施工时风险大,尤其当其面临"高承压水、圆砾层"等复杂地层特点时,施工风险更大。依托某越江隧道联络通道冻结施工实例,对冻结管成孔、施工冻结及暗挖等冻结施工全过程,采用层次分析法(AHP)探讨冷冻法施工风险,确定了各阶段各基本风险事件的相对权重,并根据权重大小确定各阶段风险最大的基本事件。研究结果表明,在复杂地层中联络通道各阶段,施工风险最大事件分别为冻结管成孔偏斜过大、冻胀压力过大和开挖泵房。

Risk Analysis of Freezing Construction Method Applied to Connection Passage for Cross River Tunnel over Difficult Stratum

This paper applies the analytic hierarchy process(AHP) over the freezing pipe pore-forming,the construction freezing,the subsurface excavation and other freezing construction steps for the probe of the construction with freezing method,and determines the relative weights of the basic risks at various stages,and finalizes the basic event with the greatest risks of each stage in accordance with the level of the weight.