Abstract
The circular lining in mechanized tunneling consists of several concrete segments which are exposed to different loading cases during tunnel construction. The loading scenarios can be divided into longitudinal loads caused by the jacks and circumferential loads resulting from soil and grouting pressure. This contribution is focused on the analysis of Steel Fiber Reinforced Concrete (SFRC) segmental linings under circumferential loads, where the area around the longitudinal joints is of particular importance. The occurrence of splitting stresses due to the partial area loading in combination with imperfections, conditioned by the construction process, often leads to a chipping of segment corners. In order to find a robust segment design, the influence of misalignments between adjoining segments on the crack pattern is investigated. In addition, a hybrid segment design is proposed and optimized with respect to robustness under consideration of uncertain parameters.
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