Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2010.03a
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- Pages.1382-1387
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- 2010
Analysis on the behavior of a old tunnel supporting system by enlargement
노후터널 확대시 기존터널 지보재 응력 변화에 대한 분석
- Baek, Ki-Hyun (Civil engineering research team, DAEWOO E&C) ;
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Kim, Woong-Ku
(Civil engineering research team, DAEWOO E&C)
;
- Seo, Kyoung-Won (Civil engineering research team, DAEWOO E&C)
- Published : 2010.03.25
Abstract
A 3D FEM numerical analysis was performed to observe the changes of supporting system of a old 1-lane tunnel when it is enlarged to 2-lane, 3-lane and 4-lane. The standard Type-III supporting pattern was applied to the new tunnel because the ground was assumed as Type-III. The observation was carried out at the middle supporting system of the old 1-lane tunnel alignment. The results shows that the changes of old tunnel supporting system began when the new tunnel was excavated at 2D(D is the equivalent diameter of 1-lane tunnel) behind of the observation place and became very rapid from 1D.