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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.19 No.3

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A fundamental study of slurry management for slurry shield TBM by sea water influence

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2017, v.19 no.3, pp.463-473
https://doi.org/10.9711/KTAJ.2017.19.3.463





& (2017). A fundamental study of slurry management for slurry shield TBM by sea water influence. (사)한국터널지하공간학회, 19(3), 463-473, https://doi.org/10.9711/KTAJ.2017.19.3.463

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, Slurry, TBM, Bentonite, Sea water

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