穿黄盾构隧洞新型复合衬砌结构特性研究

Study on structural properties of new type of composite lining in shield tunnel crossing Yellow River

为防止穿黄盾构隧洞在运行期洞内高压水从外衬管片接缝和内衬变形缝外渗,从而诱发洞外围土渗透破坏,确保隧洞能安全稳定运行。采用三维有限元分析和1∶1仿真物理模型试验的方法,对穿黄隧洞复合衬砌结构的特性进行了试验研究,探讨了结构型式、破坏机理和风险预防措施以及有关工程应用的具体问题;研究了盾构隧洞复合衬砌3种结构形式的7个具体方案。提出了预应力盾构隧洞结构型式,研发了拼装式管片环与预应力结构相结合的新型复合衬砌型式。这种创新结构设计型式在盾构隧洞工程中尚属首例,可为同类工程参考。

In order to ensure the safe and stable operation of shield tunnel crossing Yellow River and prevent high pressure water penetrating from the outer lining segment joint and inner lining deformation joint in the operation period,which may induce seepage failure of the soil surrounding the tunnel,we carried out experimental study of the characteristics of composite lining structure using 3D finite element analysis and full-scaled physical simulation model,and discuss the structural types,failure mechanism and risk prevention and some specific issues related to the engineering application.7 schemes of 3 structural types of composite lining are researched.The structural type of pre-stressed shield tunnel is proposed and the composite lining with the combination of assembled segments and pre-stressed structure is developed.The innovation structure is first applied in shield tunnel engineering.