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List of products by author: R. Kiyama
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Estimation of Rock Mass Conditions at Ten Shafts Excavated with the Raise Boring Method
Abstract: The raise boring method is widely employed for shaft excavation at limestone quarries in Japan; however, excavation in fractured or weathered rock masses may cause serious troubles such as collapse of shaft walls, stoppage of excavation, and breakage of drilling tools. Hence, it is essential to understand the rock mass conditions around a shaft before or during excavation with the raise boring...
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