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  Simulation on Shield Behaviour at a Sharp Curve by Kinematic Shield Model

  Due to ongoing development of shield tunneling technologies, usage of more complicated tunnel alignments is increasing. Excavation at a sharper curve needs proper steering of shield machines. Shield behavior is controlled usually by copy cutter, articulation mechanism, and jack force and moment. Then the kinematic shield model, which can take shield operation including the above shield operational parameters into account, had been developed, to examine shield operation at a special alignment. This study aims to examine the applicability of the kinematic shield model for shield behavior at a sharp curve. Using the site data, the shield behavior was simulated and it was compared with the measured one. At the site, the tunnel with horizontal radius of 50 m was constructed by a shield with 10.83 m in outer diameter and 10.845 m in length. As a result, it was found that the kinematic shield model can represent the shield behavior reasonably even at a sharp curve, when the effective rate of over excavation and copy cutter length, which are distributed in the circumferential direction, are considered.

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