Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering)
Online ISSN : 2185-6575
ISSN-L : 2185-6575
Paper (In Japanese)
ADVANCED PREDICTION OF TUNNEL INFLOW USING VIRTUAL DRAIN MODEL
Kenichi HOSONOTsuyoshi FUKUDAAkira FUJINOTakeshi EJIMAAkihiko WAKAI
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2022 Volume 78 Issue 1 Pages 1-12

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Abstract

 In underground construction projects such as tunneling, groundwater inflow during subsurface excavation affects safety and progress of construction. Methods for predicting the amount of tunnel inflow include a simple method using spreadsheet software and three-dimensional (3D) groundwater flow analysis using finite element method. For 3D groundwater flow analysis, a great deal of manpower is required for discretization and boundary condition setting according to the shape of the tunnel and the progress of the tunnel excavation. This paper proposes a 3D groundwater flow analysis method, “virtual drain model”, which can simulate the drainage effect of the excavated zones without modeling the tunnel structure. In order to verify the validity of the virtual drain model, the authors assumed homogeneous and heterogeneous structure and compared the analysis results obtained by the virtual drain model with the results obtained by the conventional modeling method. In addition, the authors modeled site with complex topography and geological structure and simulated the measured amount of the tunnel inflow using the virtual drain model. Satisfactory results were obtained in each validation case.

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© 2022 Japan Society of Civil Engineers
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