Evaluation of grout for reinforcing soft section in subsea tunnel

Junho Moon; Ghangbok Jeong; Zhenhua Xin; Younguk Kim

doi:10.9711/KTAJ.2018.20.6.947

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2018 Vol.20, Issue 6 Preview Page Next Page

Research Paper

Evaluation of grout for reinforcing soft section in subsea tunnel 해저터널 연약 구간 보강용 그라우트 내구성 평가

30 November 2018. pp. 947-956

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Abstract

Subsea tunnel built in abyssal zone is exposed to environment under high water pressure caused by seawater and etc., and this high pressure from underground water may facilitate leaching. In particular, since underground water can be easily flown in during construction, this might cause many problems related to cutoff water. Therefore, in order to secure safety, it is necessary to apply grouting equipment and materials which are appropriate to construction environment. Accordingly, in this research, evaluation was made on the physical characteristics of grouting materials (strength, leaching and etc. depending on curing methods for each of used materials and condition) which can be applied during subsea tunnel construction. As a result of this research, stable strength increase was found in CA and CSA type, and it is determined that no decrease in their durability was found, so these can be used as stable materials for structures under influenced by seawater.

Keywords

Subsea tunnel

Grouting

Durability

Seawater

고심도에 건설되는 해저터널은 지하수 등에 의해 높은 수압을 받는 환경에 노출되며, 고수압 해수에 의해 용탈현상이 촉진될 수 있다. 특히, 공사 중 지하수가 유입되기 쉽기 때문에 차수에 대한 많은 문제를 야기 할 수 있어 안정성을 확보하기 위해서는 시공환경에 적합한 그라우팅 장비 및 재료의 적용이 필수적이다. 이에 따라 본 연구에서는 해저터널 시공 시 적용할 수 있는 그라우팅 재료에 대한 물리적 특성(주입재료와 조건별 양생방법에 따라 강도특성, 용탈특성 등)을 평가하였다. 연구결과 CA계 및 CSA계에서 안정적인 강도증가를 발현하였으며, 내구성 저하가 발생되지 않아 해수 영향을 받는 구조물에서 안정적으로 활용될 수 있을 것으로 판단된다.

키워드

해저터널

그라우팅

국문키워드

References

Ahn, T.H., Bang, S.Y., Cha, K.S., Kim, K.M., Kim, S.J., Goo, J.S. (2016), "Development of environmental adaptive cement-reduced inorganic grouts for water blocking and soil strengthening", Proceedings of the KSCE 2016 Convention Program.

Heo, W. (2011), "Practical application for eco-grouting materials", Master's Degree Thesis, Dankook University, pp. 1-8.

Kang, S.H., Choi, H.G., Park, C.S., Noh. J.H. (2002), "Emergence of cement-based groundfill material", Jouranl of the Korean Society of Civil Engineers, Vol. 50, No. 8, pp. 9-15.

Kim, H.K., Kim, Y.H., Cheon, B.S. (2010), "Characteristics strength of silicasol-cement grout material for ground reinforcement", Journal of the Korean Geo-Environmental Society, Vol. 11, No. 9, pp. 47-53.

Kim, J.S. (2003), "The field applicability of the soft ground stabilization method by using high- performance grout", Master's Degree Thesis, Hanyang University, pp. 1-2.

Kim, J.W., Hong, E.S., Cho, G.C. (2016), "Assessment of elastic-wave propagation characteristics in grouting-improved rock mass around subsea tunnels", Journal of Korean Tunnelling and Underground Space Association, Vol. 18, No. 2, pp. 235-244.

10.9711/KTAJ.2016.18.2.235

Park, J.Y., Chun, B.S. (2001), "Soil contamination by chemical solution injection and countermeasures", 2001 Proceedings of Korean Geo-Environmental Society, KGES, pp. 26-31.

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 : 20
No :6
Pages :947-956
Received Date : 2018-08-20
Revised Date : 2018-10-02
Accepted Date : 2018-10-12
DOI :https://doi.org/10.9711/KTAJ.2018.20.6.947

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

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