Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2006.10a
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- Pages.56-65
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- 2006
A Case Study on Construction of Tunnel Crossed by Abandoned Tunnel
터널 갱구부 폐터널 교차구간 시공사례
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Ra, Seung-Hoon
(GS Engineering & Construction, Geosystem Engineering Team)
;
- Kim, Dong-Hyun (GS Engineering & Construction, Geosystem Engineering Team) ;
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Lee, Sang-Pil
(GS Engineering & Construction, Geosystem Engineering Team)
;
- Lee, Hun-Yeon (GS Engineering & Construction) ;
- Jeong, Se-Heon (GS Engineering & Construction)
- Published : 2006.10.27
Abstract
As portions(28m) of the designed tunnel was crossing the abandoned tunnel, methods for safe construction were demanded. The level of the abandoned tunnel and the designed tunnel was almost same and each tunnel was crossing at an angle of about 40 degrees. Therefore the abandoned tunnel would adversely affect the stability of the designed tunnel. Some sections of the abandoned tunnel passes through the designed tunnel wall were fully filled with tunneling spoil and cement milk grouting to increase tunnelling stability. By checking physical properties of grouting cores drilled at the cross section of the designed tunnel and the abandoned tunnel, the quality of material filled in the abandoned tunnel was confirmed. Also the stability of the designed tunnel was checked by the monitoring during excavation of the tunnel.
계획된 터널 갱구부에서 일부 구간(28m)이 용도폐기된 터널과 교차하여 안전한 시공을 위한 대책방안이 요구되었다. 폐터널은 계획터널과 계획고가 거의 같은 상태에서 경사교차하여 계획터널의 시공 중 안정성과 영구 안정성에 큰 위해 요소가 되었다. 본 터널 벽면을 관통하여 지반에 위치한 폐터널의 일정 구간을 버력과 시멘트 밀크 그라우팅으로 밀실하게 채워 안정성을 확보하였다. 되메움 후 폐터널 교차 구간 시공 시 그라우팅 core를 획득하여 물성시험을 통해 시공품질을 확인하였고, 시공 중 계측을 통해 안정성을 확인하였다.