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中文摘要：
在荷载结构模型、弹性链杆有限元法的基础上，文章采用叠合梁模型模拟计算双层模筑混凝土衬砌的受力情况。双层衬砌之间通过只能受压的径向弹簧传递接触压力，达到双层模筑混凝土衬砌共同承担围岩荷载、自动分配荷载比例的目的。计算结果表明：叠合梁模型在分析双层模筑混凝土衬砌安全稳定性时具有传统方法所不具有的优势，该模型可以为复杂隧道衬砌结构的设计和检算提供一个新思路，同时采用叠合梁模型进行双层模筑混凝土隧道衬砌受力检算时，建议层间弹簧弹性系数在拱腰以下取500MPa／m、拱腰拱顶范围取300MPa／m。
英文摘要：
Based on the load structure model and the elastic linkage finite element method, the force applied on a double-layer tunnel lining with molded concrete was simulated using a composite beam model. As the contact pres- sure between the two lining layers is transferred by the radial spring, which can only be compressed, the double-lay- er molded concrete lining can share the load, whose ratio can be distributed automatically. The calculation results show that the composite beam model has advantages over the traditional methods in terms of the analysis of safety and stability of the double-layer lining with molded concrete and can serve as a new approach for the design and cal- culation of complex tunnel linings. It is suggested that an elastic coefficient of 500 MPa/m below the haunch and 300 MPa/m between the crown and haunch should be used when the force on the double-layer lining is calculated based on a composite beam model.
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