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発表 Comparison of structural load-bearing performance between precast and cast-in place permanent linings

作成年度 2024 年度
論文名 Comparison of structural load-bearing performance between precast and cast-in place permanent linings
論文名(和訳)
論文副題
発表会 World Tunnel Congress 2024(世界トンネル会議 2024)
誌名
巻・号・回
発表年月日 2024/04/19 ~ 2024/04/25
所属研究室/機関名 著者名(英名)
トンネルチーム菊地 浩貴(KIKUCHI Koki)
トンネルチーム日下 敦(KUSAKA Atsushi)
トンネルチーム小泉 悠(KOIZUMI Yu)
PCL協会渡部 敏(WATANABE Toshi)
戸田建設株式会社巽 義知(TATSUMI Yoshitomo)
抄録
In Japan, it is common for road tunnels to be constructed using conventional tunnelling method. According to technical standard of road tunnel and its explanation (for structure) (2008) and Standard Specification for Tunnelling (2016), in sections with an inner width of approximately 10 meters and where no external forces other than self-weight are expected, cast-in-place unreinforced concrete with a design thickness of 30 cm is commonly applied. These specifications are not determined through performance assessments but have become assumed standards for standard sections based on past construction records and the cost-effectiveness and consistent quality of unreinforced concrete. In tunnels where construction satisfying the above specifications has been conducted in standard sections, instances of significant deterioration in structural stability during the operational period are extremely rare. Therefore, despite not being determined through performance assessments, it can be considered that the specifications for conventional lining work ensure load-bearing capacity and other performance criteria. In recent years, in Japan, there have been cases where the adoption of precast lining work has been considered for the purpose of improving the speed of construction, among other reasons. However, the adoption of precast lining work in mountain tunnels in Japan is very rare, and there are still aspects where the impact of joint structures, joint positions, and the number of joints between precast sections on the failure mechanism and structural strength of the lining has not been elucidated. In this research, we conducted large-scale loading tests usingtwo types of precast lining work with different joint structures, aiming to understand the mechanical properties of precast lining work, including load-bearing capacity and failure mechanisms, in comparison to conventional lining work.
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