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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.21 No.2
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Effect of seawater on the applicability of a slurry shield TBM

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2019, v.21 no.2, pp.243-256
https://doi.org/10.9711/KTAJ.2019.21.2.243




& (2019). Effect of seawater on the applicability of a slurry shield TBM. (사)한국터널지하공간학회, 21(2), 243-256, https://doi.org/10.9711/KTAJ.2019.21.2.243
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Abstract

Formation of filter cake with little slurry penetration into the tunnel face ground is an essential factor to successfully apply the slurry shield tunnel boring machine (TBM) for tunnelling work. However, when the bentonite slurry is in contact with seawater, it is not easy to guarantee the filter cake formation due to decrease of the swelling volume and viscosity of the slurry. In this study, in order to evaluate the effect of the seawater on the applicability of the slurry shield TBM method, the slurry injection tests were carried out with the variation of seawater percentage contained in the slurry samples as well as the variation of soil types. And then, the effect of these two factors on the slurry clogging phenomena was theoretically and experimentally figure out. As a result, it was found that the value of the slurry clogging criteria (SCC) indicating the applicability of the slurry shield TBM significantly decreases up to 67% as the percentage of seawater increases from 0% up to 20%. In addition, it was found to be necessary to take into account both the characteristics of slurry and soil types together when judging the applicability of the slurry shield TBM method by assessing the slurry penetration characteristics that will occur during tunnelling work.

keywords
슬러리, 벤토나이트, 해수, 폐색현상, Slurry, Bentonite, Seawater, Clogging effect

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