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A Study on the Stability Analysis and Countermeasure of Tunnel Portal Failure Slope - in Suanbo Hot Springs 1 and 2 Tunnel Failure Site  

Baek, Yong (한국건설기술연구원 토목연구부)
Koo, Ho-Bon (한국건설기술연구원 토목연구부)
Yoo, Ki-Jeong (한국건설기술연구원 토목연구부)
Publication Information
The Journal of Engineering Geology / v.12, no.4, 2002 , pp. 367-378 More about this Journal
Abstract
Recently, the number of tunnels on national roads has been increased due to the trend that construction of the large-scaled cut slopes is limited because of the environmental issues. Therefore, the slope failures of tunnel portal have often occurred. The tunnel portal in use has limitations on selection of the countermeasure and construction against slope failure. In the cases of Suanbo hot springs 1 and 2 tunnel portals, seedding was chosen and constructed as the countermeasureof slope failure when the tunnel was first built but collapsed in April, 2002. In this study, the failure sites were examined accurately through the site investigation and an efficient countermeasure according to stability analysis is presented. It is shown that it is very efficient to use resloping for Suanbo hot springs 1 tunnel and concrete buttress, rock anchor to reinforcement countermeasure, and attached rockfall prevention net by dividing the site into 3 sections for Suanbo hot springs 2 tunnel.
Keywords
tunnel portal; slope stability analysis; slope countermeasure; resloping; reinforcement countermeasure;
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