盾构管片纵向接缝位置对结构内力和变形的影响分析

根据盾构隧道管片衬砌之间的连接特性、衬砌结构与土层之间的相互作用性质，提出了基于弹性地基理论的盾构隧道管片衬砌结构的梁-弹性铰-地基系统模型，并研制了相应的有限元分析程序FHEF，该模型能直接计算出盾构隧道管片衬砌结枸的轴力、剪力、弯矩和变形，将计算结果直接用于工程设计。依据二维计算模型，就盾构隧道管片衬砌结构纵向接缝不同位置对衬砌结构的内力影响进行了详细计算分析，计算结果表明，纵向接缝的不同位置对结构的内力和变形不容忽视，工程设计时应从结构设计和防水设计等多个角度来确定纵向接缝的设置，从而指导工程实践。

Influence of Segments Joint Position on Structural Inner Force and Deformation in Shield Tunnel

With the study on the deformation character of longitudinal joint of shield tunnel and the interaction between the segment lining and soil layers,a 2-D structural model of segment lining composed of beam element,hinge element and elastic foundation element is proposed based on the elastic foundation theory.The corresponding FEM program FHEF(Frame Hinge on Elastic Foundation) is developed.The structural axial force,shear force,moment and deformation can be calculated with the model,and can be used for engineering design directly.The influence of longitudinal joint position on the structural inner force and deformation is analyzed in detail.The result denotes that the influence can not be ignored in the engineering design.An example is given to determine the position of the longitudinal joint from the engineering structural design and waterproof design comprehensively.