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http://dx.doi.org/10.15683/kosdi.2021.9.30.454

A Study on the Excavation of the Center Wall for the Evacuation Passageway in the Operating 2-Arch Tunnel  

Lee, Jong-Hyun (Department of Civil Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Society of Disaster Information / v.17, no.3, 2021 , pp. 454-464 More about this Journal
Abstract
Purpose: There is a need to construct an evacuation passageway for the 2-Arch tunnel, which has been constructed and is in operation. Therefore, it aims to analyze tunnel and center wall behaviour and stability due to excavation of the center wall. Method: We describe the theoretical background of 2-Arch tunnel and evacuation passageway, and focused on analyzing the behaviour of tunnel and wall using 3-dimensional finite element analysis. Parametric analysis according to rock rating was performed with various ground conditions, and the displacement and stress of the center wall were intensively analyzed. Result: With the center wall excavation, the largest amount of settlement was shown in the center of the opening, and the stress was greatest during the first excavation. In addition, it was shown that stress concentration occurred at the top of both openings, and stability reviews considering the concept of allowable stress showed that it exceeded the allowable stress. Conclusion: Although the displacement of the tunnel has secured stability within the allowable standard, the generated stress is found to exceed the allowable standard, so it is necessary to prevent sudden stress release by applying appropriate reinforcement methods during construction.
Keywords
2-Arch Tunnel; Excavation Passageway; Center Wall; Finite Element Analysis; Allowable Stress;
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