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List of products by author: Y. Koyama
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A Study of Excavation Characteristics of Donut Type TBM by Excavation Experiment with High-strength Mortar
Abstract: A tunnel boring machine with an opening in the center of its cutter head, i.e., a donut-shaped tunnel boring machine (DTBM), is proposed. Since the new donut type TBM does not excavate the central section, its assumed excavation characteristics include reduced excavation time, due to reduction of the excavation area and elimination of the use of a center cutter. In order to demonstrate these...
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