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Abstract: In Amagase Dam redevelopment project, the stilling basin of tunnel-type outlet facilities is an extremely large cross-sectional tunnel (maximum drilling cross-sectional area: approx. 650 m2, maximum inner section finish area: approx. 500 m2) for dissipating the discharged water from the main gate before it flows into the Uji River. The target geology is mostly hard sandstone, but a large...