【摘要】 网格式盾构法施工隧道工程由于其快速、经济常用于电厂建设中的进排水隧道工程中。但网格式盾构施工对土体扰动较大,对海堤的变形和稳定均造成较大的影响;同时软土地区的海堤在自身荷载作用下沉降尚未完成,尤其是下卧层沉降未稳定,导致盾构隧道产生一定的纵向不均匀变形;盾构隧道施工和海堤相互影响成为亟待解决的关键问题。以大唐宁德电厂穿越新建海堤的进排水盾构隧道工程为例,在有限元数值计算分析基础上,提出了切实可行的加固措施,指导设计和施工;同时,对隧道施工过程中原位测试数据作了详细的分析;最后,给出了盾构在穿越海堤阶段的推荐施工速度、施工中建议采用的注浆和预起拱等加固措施以及隧道的变形、孔压等方面的一些规律性结论,为实际工程中类似的穿堤盾构隧道设计与施工控制提供依据。更多还原

【Abstract】 The shield method is often used for the inflowing and draining shield tunnels in the construction of power plants.However,the soil will be considerably disturbed due to this method,and it will affect the deformation and stability of sea embankments.Meanwhile the post-construction settlements of thick soft sublayer will result in the longitudinal differential deformation.Then the interaction between the tunnels and embankments is the key problem to be solved.The inflowing and draining shield tunnel in the Datang Nengde Power Plant was taken as an example,and practical and effective measures were suggested based on the numerical analysis of the settlement of embankments and the differential deformation of the shield tunnel.Based on the analysis of monitoring data,the conclusions about the behavior of the tunnel and the recommended construction rate were proposed.These results would provid a scientific reference for the design and construction control of similar shield tunnels in practice.更多还原