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[CS1-22] Estimation of Deformation Mechanisms and Countermeasure Policies for Mountain Tunnels Caused by Heavy Rainfall

*Hiroki Kogano¹, Hisataka Nagamatsu², Tomohisa Ano³ (1. TAISEI CORPORATION, 2. Ministry of Land, Infrastructure, Transport and Tourism, 3. Eight-Japan Engineering Consultants Inc.)

Keywords:mountain tunnel, groundwater level, Repeatability Analysis, covering structure, impermeable layer, drained borehole