Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Characteristics of High-viscosity Grouting Materials for Rock Joint Reinforcement of Deep Tunnel

대심도 터널 암반 절리 보강을 위한 고점도 그라우팅 재료의 특성

  • Yoon, Inkook (Department of Civil and Environmental Engineering, Myongji University) ;
  • Moon, Junho (Department of Civil and Environmental Engineering, Myongji University) ;
  • Lee, Junsu (Department of Civil and Environmental Engineering, Myongji University) ;
  • Kim, Younguk (Department of Civil and Environmental Engineering, Myongji University)
  • Received : 2021.11.05
  • Accepted : 2021.11.23
  • Published : 2021.12.01
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Abstract

This study presented the characteristics and additive effects of the grout with mixing ratio for developing of high-efficiency grouting technology under high depth conditions. The laboratory investigation were conducted with Portland cement (OPC) and micro cement (S8000-E) including viscosity experiments, particle size analysis experiments, Gel-Time experiments and uniaxial compressive strength experiments. As a result of the viscosity experiment, it was shown that OPC is advantageous in terms of viscosity, but S8000-E is suitable when considering the passage of rock joint intervals through particle size analysis. The Gel-Time experiment shows that it is not that difficult with injection as a grout material even when silica fume (SF) was applied. The strength of the cured material is improved as increase in the content of silica fium (SF). Within the range of the study, the optimal mixing ratio obtained through various experiments is S8000-E, w/c=70%, silica fium (SF)=6%, and 7 days.

본 연구는 대심도 조건의 고효율 그라우팅 기술개발을 위한 그라우트재 배합비를 제시한 것으로써 연구에 사용된 1종 보통 포틀랜드 시멘트(OPC)와 마이크로 시멘트(S8000-E)의 배합별 특성과 첨가제 효과를 점도 실험, 입경분석 실험, Gel-Time 실험, 일축압축강도 실험을 통해 확인하였다. 점도실험 결과 점도적인 측면에서 고려하였을 때 OPC가 유리하지만 입경 분석을 통한 암반 절리 간격 통과 고려 시 S8000-E가 적합하다는 것을 확인할 수 있었다. Gel-Time 실험 결과 OPC보다 S8000-E에서 효율적인 값을 나타내었으며 실리카퓸(SF) 적용 시에도 그라우트재로서 주입에는 문제가 없음을 확인하였다. 일축압축강도 시험결과 실리카퓸(SF) 함유량 증가에 따른 강도 증진 효과 및 양생시간에 따른 압축강도 변화를 확인하였으며 여러 가지 실험을 통해 산정된 최적의 배합비는 S8000-E, w/c=70%, 실리카퓸(SF)=6%, 7일 양생으로 대심도 조건의 고효율 그라우트재로서 주입에 가장 효과적인 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의(도심 지하 교통 인프라 건설 및 운영 기술 고도화 연구, 과제번호: 21UUTI-B157813-02) 지원으로 수행되었음으로 이에 깊은 감사를 드립니다.

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