Abstract
This paper presents an analytical mechanical model for tunnel boring machine (TBM) tunnel lining segmental joints exposed to fire. Based on the general flat joint model, the model was derived under the thermal effect induced by elevated temperature. A fitting function for describing the relationship among the ratio of concrete deformation, strain in the outer edge of compressive zone of joint and height of compressive zone is proposed using a result from a finite element method (FEM) analysis in which parameters were obtained by calibration against true scale model tests. The concept of temperature adjustment coefficient on joint section is proposed, which improves the calculation method of joint section temperature field. Influence of elevated temperature and axial force on the bending moment characteristic of a segmental joint was examined. The validation of this model was through the comparison with the results of fire tests. This model contributes to comprehending mechanics characteristics of shield TBM tunnel lining joint under high temperature and the design of the joint.
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