Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Evaluation of grout for reinforcing soft section in subsea tunnel

해저터널 연약 구간 보강용 그라우트 내구성 평가

  • Moon, Junho (Dept. of Civil and Environmental Engineering, Myongji University) ;
  • Jeong, Ghangbok (DODAM ENC) ;
  • Xin, Zhenhua (Dept. of Civil and Environmental Engineering, Myongji University) ;
  • Kim, Younguk (Dept. of Civil and Environmental Engineering, Myongji University)
  • Received : 2018.08.20
  • Accepted : 2018.10.12
  • Published : 2018.11.30
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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.

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.

Keywords

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Fig. 1. Experiment of grout material

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Fig. 2. Weight loss with time (room temperature)

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Fig. 3. Compression strength (room temperature)

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Fig. 4. Weight loss with time (fresh water deposition)

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Fig. 5. Compression strength (fresh water deposition)

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Fig. 6. Weight loss with time (seawater deposition)

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Fig. 7. Compression strength (seawater deposition)

Table 1. Grouting material

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Table 2. Mixing ratio by grout materials

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Table 3. Experimental conditions

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References

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