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  The study of support pattern in modern rock TBM with a pressurized ring beam system

  The pressurized ring beam has been devised to improve the performance of primary support by applying pressure to circular steel ribs (i.e., ring beams) during operating a modern rock TBM. In this paper, an appropriate support pattern is suggested for the pressurized ring beam in consideration of typical ground conditions for the modern rock TBM. A case study has been performed with respect to typical construction conditions, which indicates the pressurized ring beam is an economically feasible and optimum support system in comparison with the conventional ring beam support system.

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