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2017 Vol.19, Issue 3 Preview Page
A fundamental study of slurry management for slurry shield TBM by sea water influence

해수의 영향에 따른 이수식 TBM의 슬러리 관리를 위한 기초적 연구

Dae-Young Kim1*
,
Jae-won Lee2
,
Jae-Hoon Jung2
,
Han-Byul Kang2
,
Sung-Hyun Jee3
김 대영1*
,
이 재원2
,
정 재훈2
,
강 한별2
,
지 성현3
1Member, General Manager., Dept. of R&D., Hyundai Engineering & Construction
2Assistant Manager., Dept. of R&D., Hyundai Engineering & Construction
3General Manager., Dept. of R&D., Hyundai Engineering & Construction
1한국전력연구원 차세대송변전연구소 선임연구원
2한국전력연구원 차세대송변전연구소 연구원
3한국전력연구원 차세대송변전연구소 책임연구원
*교신저자. *Corresponding Author. 
31 May 2017. pp. 463-473
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Abstract

Bentonite swells when it comes into contact with water and makes it a viscous fluid. Thus it is widely used in civil engineering works for waterproofing. Utilizing the properties of bentonite, the slurry shield TBM supports excavated face with pressurized slurry as well as transporting excavated muck. When bentonite is in contact with seawater, due to the change of double layer thickness, its expandability and viscosity are lowered. This may cause problems for excavation stability and muck discharge due to the increase of sea water inflow when Slurry TBM is used under sea water conditions. In this study, the change of slurry condition caused by the inflow of sea water during tunnel excavation with Slurry TBM was investigated and a slurry management guideline was proposed. For this purpose, a laboratory test was carried out based on the slurry management criterions applied in the field, and a method applicable to the field where sea water is affected has been proposed.

Keywords
슬러리
이수식 TBM
벤토나이트
해수

벤토나이트는 물과 접촉하면 팽창하고 점성을 발휘하는 성질이 있어 일반적으로 차수 가 필요한 토목공사에 많이 활용되고 있다. 이수식 TBM에서는 이와 같은 성질을 활용 하여 가압된 슬러리로 불투수성 막을 형성하고 굴착벽면의 붕괴를 방지하는 동시에 굴 착된 버력을 운송하며 굴착을 수행한다. 하지만 벤토나이트는 해수와 접촉할 경우 팽창 성이 저하되어 그 성질을 발휘하지 못하는 문제가 있다. 이는 해수 조건에서 이수식 TBM으로 터널을 굴착할 시 지하수 유입 증가로 인한 굴착 안정성 및 버력 배출에 문제를 초래할 수 있다. 본 연구에서는 이수식 TBM으로 터널을 굴착 시 해수의 유입으로 인한 슬러리의 상태변화를 살펴보고 이에 대응하기 위한 슬러리 관리방안을 제시 하였다. 이를 위해 현장에서 적용된 슬러리 품질관리 기준을 바탕으로 실내 시험을 수행하였으며, 해수의 영향이 있는 현장에 적용 할 수 있는 방안을 제시하였다.

키워드
Slurry
TBM
Bentonite
Sea water
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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 : 19
  • No :3
  • Pages :463-473
  • Received Date : 2017-04-14
  • Revised Date : 2017-05-09
  • Accepted Date : 2017-05-16
  • DOI :https://doi.org/10.9711/KTAJ.2017.19.3.463
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