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2020 Vol.22, Issue 4 Preview Page

Research Paper

A study of mixing ratio of seal material for umbrella arch reinforcement for tunnelling

터널 강관 보강형 다단 그라우팅의 Seal재 배합비에 대한 연구

Beoung-Hyeon Hwang1
,
Yeon-Deok Kim2
,
Jae-Hoon Sim3
,
Sang-Hwan Kim4*
황 병현1
,
김 연덕2
,
심 재훈3
,
김 상환4*
1Master Student, Dept. of Civil Engineering, Hoseo University
2Ph.D. Student, Dept. of Civil Engineering, Hoseo University
3Head of the Design Team, Hyundai Engineering & Construction
4Professor, Dept. of Civil Engineering, Hoseo University
1학생회원, 호서대학교 토목공학과 석사과정
2정회원, 호서대학교 토목공학과 박사과정
3비회원, 현대건설 설계팀장
4정회원, 호서대학교 토목공학과 교수
* Corresponding Author
31 July 2020. pp. 367-381
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Abstract

This paper presents the seal material mixing ratio of tunnel umbrella arch reinforcement method. Currently, there is no clear standard for the proper gelation time and curing time of the Seal material in Korea, and the quality control is also difficult because it cannot be verified. In response, the ratio of the mixture of the seal material was composed of four types of indoor experiments, and the amount of gelation time and bleed was checked. In addition, a non-cart penetration test confirmed the curing time and compared the ratio of each combination. Further experiments on W/C 120% identified the effect of mixing speed and time on the seal material. A total of three field experiments were conducted based on indoor experiments, and the size and strength of bulb formation were compared by checking the curing time of the specimen and main injection. Comparisons show that the lower W/C, the stronger the strength, the larger the size of the bulb, and the faster the hardening time appears. Based on the results of the gelation time and curing time, it was deemed that the mixing ratio of W/C 120% is most appropriate when applied to the actual site.

Keywords
Seal material
Umbrella arch reinforcement method
Mixing ratio
Gelation time
Bleeding

본 연구는 강관다단 그라우팅 공법의 Seal재의 배합비 결과에 대한 연구이다. 현재 국내에는 Seal재의 적정 겔화시간 및 초결시간에 대한 명확한 기준이 없는 실정이며, 이를 확인할 수 없어 품질관리에도 어려움이 있다. 이에 Seal재의 배합비를 4가지로 구성하여 실내 실험을 진행하였으며, 이를 통해 겔화시간 및 블리딩양을 확인하였다. 또한 비카트침 관입 실험을 통해 초결시간을 확인하고 각 배합비의 비교를 진행하였다. 그리고 W/C 120%에 대한 추가적인 실험을 통해 교반 속도와 시간이 Seal재에 미치는 영향을 파악하였다. 실내실험을 기반으로 총 3가지의 배합비에 대한 현장 실험을 진행하였으며, 시료의 초결시간 확인 및 본주입을 통한 구근 형성 크기와 강도를 비교하였다. 비교 결과 W/C가 낮을수록 강도가 강하고 구근의 크기가 크며, 초결 시간이 빠르게 나타나는 결과를 확인하였다. 겔화시간과 초결시간 결과를 통해 실제 현장에 적용 시 W/C 120%의 배합비가 가장 적절할것으로 나타났다.

키워드
실링재
강관다단 그라우팅
배합비
겔화시간
블리딩
References
1
Cho, I.S., Park, J.J., Kim, J.S., Lee, I.M. (2010), "New tunnel reinforcement method using pressurized cavity expansion concept", Journal of Korean Tunnelling and Underground Space Association, Vol. 12, No. 6, pp. 407-416.
2
Hong, Y.H., Yu, J.D., Byun, Y.H., Jang, H.I., You, B.C., Lee, J.S. (2013), "Integrity evaluation of grouting in umbrella arch methods by using guided ultrasonic waves", Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 3, pp. 187-199.
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3
Kim, G.H., Choi, C.R., No, J.G., Choi, J.Y. (2018), "A case study on the steel pipe multistage grouting", Magazine of Korean Tunnelling and Underground Space Association, Vol. 20, No. 3, pp. 67-76.
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8
Shin, H.K., Jung, H.S., Kim, D.H., Ryu, Y.S., Kim, D.H. (2019), "Development of rapidly hardening seal material applicable to steel pipe multistage grouting", Journal of Korean Tunnelling and Underground Space Association, Vol. 21, No. 2, pp. 301-321.
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 : 22
  • No :4
  • Pages :367-381
  • Received Date : 2020-05-08
  • Revised Date : 2020-06-30
  • Accepted Date : 2020-07-06
  • DOI :https://doi.org/10.9711/KTAJ.2020.22.4.367
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