A study on the face pressure control and slurry leakage possibility using shield TBM model test

Sungyil Koh; Hyunkang Shin; You-Sung La; Hyuksang Jung

doi:10.9711/KTAJ.2020.22.3.277

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2020 Vol.22, Issue 3 Preview Page Next Page

Research Paper

A study on the face pressure control and slurry leakage possibility using shield TBM model test 축소 모형실험을 통한 토피조건별 이수압식 쉴드 TBM의 챔버압 및 이수분출 가능성 평가

31 May 2020. pp. 277-291

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Abstract

Shield TBM is a tunnelling method that has a wider range of applications in the poor ground condition compared to conventional tunnels (Drill and Blast). Currently, a 13.3 m large-diameter slurry shield TBM is preparing for construction to pass under the Han River. Shield TBM is divided into slurry and EPB shield TBM, and management items during construction are different depending on each characteristic. In this paper, the equipment type, origin, application case and trouble case were analyzed for slurry shield TBM, which is mainly constructed in soft ground. In addition, 2D and 3D model tests were conducted on the condition of soil depth for the possibility of slurry leakage into front of the equipment, with appropriate chamber pressure. Based on this paper, it proposed to provide basic and reference data for proper excavation surface pressure and chamber pressure during construction of slurry shield TBM under soft ground conditions, and proposed measures to minimize stability and environmental decline due to slurry ejection.

Keywords

Slurry shield TBM

Excavation surface pressure

Slurry leakage

쉴드 TBM은 기존 재래식 터널(Drill and Blast)에 비하여 터널을 굴착하는 지반 및 선형조건에서 적용범위가 넓은 공법으로 대단면, 대심도, 초연약지반에서의 터널링 공법으로 중요성이 부각되고 있으며, 현재 13.3 m의 대구경 slurry 쉴드 TBM이 한강 하부 통과를 위한 시공을 준비하고 있다. 쉴드 TBM은 이수압식과 토압식 쉴드 TBM으로 구분되고, 각각의 특성에 따라 시공 중 관리 항목이 달라진다. 본 논문에서는 연약지반에 주로 시공되는 이수압식 쉴드 TBM을 대상으로 장비형식, 발생기원, 적용 사례 및 트러블 사례를 분석하였다. 또한, 적정 챔버압, 장비 전방으로의 이수 분출(또는 누수)가능성을 토피고 조건에 따라 2D 및 3D 모형실험 실시하였다. 이를 토대로 연약지반 조건에서 이수압식 쉴드 TBM 시공 시 적정 굴진면 토압과 챔버압 예측을 위한 기초 및 참고자료 제공 그리고 토피고 조건에 따른 이수분출 위험 높이를 제안하여 이수분출로 인한 안정성 및 환경요인 저하 원인을 최소화하기 위한 방안을 제안하였다.

키워드

이수압식 쉴드 TBM

굴진면 토압

이수 분출

References

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Copperthwaite, W.C. (2016), Tunnel Shields and the Use of Compressed Air in Subaqueous Works, Palala Press, California, pp. 256-257.

Guglielmetti, V., Grasso, P., Mahtab, A., Xu, S. (2003), Mechanized Tunnelling in Urban Areas: Design methodology and construction control, Taylor & Francis, Abingdon-on-Thames, pp. 91-92.

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 22
No :3
Pages :277-291
Received Date : 2020-03-05
Revised Date : 2020-04-10
Accepted Date : 2020-04-23
DOI :https://doi.org/10.9711/KTAJ.2020.22.3.277

Journal of Korean Tunnelling and Underground Space AssociationISSN:2233-8292(Print) 2287-4747(Online)한국터널지하공간학회

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