A study on the evaluation method of blow-out and segment lining buoyancy stability of a slurry shield TBM

Yoon-Ho Jang; Hong-Joo Kim; Young-Wan Shin; Hyuk-Sang Chung

doi:10.9711/KTAJ.2022.24.5.375

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2022 Vol.24, Issue 5 Preview Page Next Page

Research Paper

A study on the evaluation method of blow-out and segment lining buoyancy stability of a slurry shield TBM 쉴드TBM 이수분출 및 세그먼트라이닝 부력 안정성 평가방법 연구

30 September 2022. pp. 375-393

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Abstract

This study was deal with blow-out and buoyancy stability evaluation method for slurry shield TBM. When applying a slurry shield TBM for the construction of a shallow tunnel under river or sea, the stability of slurry blow-out and segment lining buoyancy should be evaluated. However, there is a problem in that the currently applied theoretical formula is somewhat complicated, making it inconvenient to calculate in practice. In this study, some simple charts were proposed to easily evaluate the stability of slurry blow-out and segment lining buoyancy. In addition, the buoyancy safety factor of segment lining using the strength reduction method was evaluated and compared with the buoyancy safety factor based on the theoretical formula. The buoyancy safety factor by the theoretical formula was evaluated to be rather small, and it was confirmed that it was on the safe side. The simplified charts for the evaluation of slurry blow-out and buoyancy stability presented in this study are expected to be usefully utilized in the planning and design of undersea tunnels.

Keywords

Shield TBM

Buoyancy

Slurry Blow-out

Maximum management pressure

Strength reduction method

본 논문은 이수식 쉴드TBM의 이수분출 안정성 및 세그먼트라이닝 부력에 대한 안정성 평가법의 제안에 대한 내용을 다루고 있다. 토피가 얇은 하 ‧ 해저터널 건설을 위해 이수식 쉴드TBM 적용 시 이수분출 안정성 및 세그먼트라이닝 부력 안정성을 평가하여야 하는데 현재 적용되는 이론식은 다소 복잡함에 따라 실무적으로 계산이 불편한 문제점이 있다. 본 연구에서는 이수분출 안정성 및 세그먼트라이닝 부력 안정성 평가방법을 고찰하고 터널 계획단계에서 간편하게 이수분출 안정성과 부력 안정성을 평가하는 간편도표를 제안하였다. 또한, 강도감소법을 활용한 세그먼트라이닝에 작용하는 부력 안전율을 평가하고 이론식에 의한 부력 안전율과 비교 ‧ 분석을 수행하였다. 본 연구에서 제시된 이수분출 및 부력 안정성 평가를 위한 간편도표는 하 ‧ 해저터널 계획 및 설계 시 유용하게 활용될 수 있을 것으로 기대된다.

키워드

쉴드TBM

부력

이수분출

최대관리압

강도감소법

References

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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 : 24
No :5
Pages :375-393
Received Date : 2022-07-22
Revised Date : 2022-08-15
Accepted Date : 2022-08-16
DOI :https://doi.org/10.9711/KTAJ.2022.24.5.375

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

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