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软土有压输水盾构隧洞采用管片外衬和整筑预应力内衬作复合式衬砌的设计计算中,为能较好考虑内衬与外衬管片的相互作用,以及内衬预应力荷载在隧洞施工和运营各阶段对复合衬砌结构受力的影响,本文提出了一种新的实体叠合计算模型。由于确定管片纵缝接头抗弯刚度的复杂性,文中建议对用数值模拟管片纵缝接头刚度采用了一种非线性耦合弹簧“接触对”的模拟系统。在采用实体单元建模的条件下,由于计入管片接头刚度的力学处理困难,文中研究了一种能以模拟管片接头刚度的简化计算方法。根据内、外衬砌接触界面处理方式的不同,文中提出了5种适合不同界面条件内、外层衬砌的相互作用模型。此外,本文还研制了内衬预应力荷载的一种转化程序,以解决采用等效荷载法施加预应力时的前处理问题。上述各点创意构思已在南水北调中线一期穿黄隧洞的结构设计研究中得到了具体反映和成功应用。
In the design and calculation of the composite liner with the shield tunnel and the lining prestressed concrete lining of the soft-pressurized water conveyance shield tunnel, in order to better consider the interaction between the liner and the liner, and the lining pre- The influence of stress load on the stress of composite lining structure in various stages of tunnel construction and operation, this paper presents a new solid overlap calculation model. Because of the complexity of determining the flexural rigidity of the pipe longitudinal joint, a nonlinear coupling spring “contact pair ” simulation system is proposed to simulate the longitudinal joint stiffness of the pipe by numerical simulation. Under the condition of solid element modeling, due to the mechanical treatment of the stiffness of the segment joint, a simplified method to simulate the joint stiffness of the segment joint is studied. According to the different inner and outer lining contact interface treatments, five kinds of interaction models of inner and outer linings are proposed in this paper. In addition, a kind of conversion procedure of lining prestressed load was developed in order to solve the problem of pretreatment when prestress was applied by equivalent load method. The creative ideas of the above points have been specifically reflected and successfully applied in the structural design of the Yellow River tunnel in the first stage of the South-to-North Water Diversion Middle Route Project.