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  Structural behavior of precast tunnel segments under TBM thrust actions

  Precast elements for tunnel linings are design by considering several loading conditions. Some of these loading configurations can be studied by means of simplified analytical approaches which enable to easily include the FRC resistant contribution according to the design rules proposed by fib Model Code. On the other hand, some mechanisms need to be studied by means of NLFEA in order to properly assess the benefits due to fibers. These mechanisms generally occur during the lining construction process, since they are correlated to the introduction of the TBM’s thrust jack forces (thrust jack phase) or depend on torsion effects caused by the ovalisation of lining rings outside the TBM’s shield during the grouting process. The present paper concerns the study of a segmental tunnel lining by means of non-linear numerical analyses regarding the thrust jack phase.

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