Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of the Groutability through Microcrack and Viscosity Measurement Methods for Grouting Materials

미세균열 그라우팅 주입성능 및 재료의 점도 측정방법 평가

  • Jin, Hyun-Woo (Dept. of Smart City & Construction Engrg., Korea Univ. of Science and Technology) ;
  • Ryu, Byung-Hyun (Geotechnical Engrg. Research Institute, Korea Institute of Civil Engrg. and Building Technology) ;
  • Lee, Jang-Guen (Geotechnical Engrg. Research Institute, Korea Institute of Civil Engrg. and Building Technology, Dept. of Smart City Construction Engrg., Korea Univ. of Science and Technology)
  • 진현우 (과학기술연합대학원대학교 스마트도시.건설융합과) ;
  • 유병현 (한국건설기술연구원) ;
  • 이장근 (한국건설기술연구원, 과학기술연합대학원대학교 스마트도시.건설융합)
  • Received : 2017.07.11
  • Accepted : 2017.09.05
  • Published : 2017.09.30
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Abstract

In order to develop urban underground spaces, even microcracks should be reinforced. In this paper, the grouting injection performance for microcracks was investigated considering the viscosity and particle size of the grouting materials, injection pressure, and crack width. There are two types of typical grouting materials used for filling micro-cracks. One is a chemical liquid grouting material which is a solution type and the other is a cementitious grouting material which is a suspension type. The injection performance of the grouting materials for microcracks is generally influenced by the viscosity, and the injection performance of the cementitious grouting material is additionally affected by the particle size. From laboratory tests, the viscosity was calculated inversely to provide a suitable viscosity measurement method for each grouting material. The groutability ratio based on the relationship between the crack width and the particle size was evaluated to estimate the grouting feasibility of the cementitous grouting material through microcracks.

도심지 지하공간 개발을 위해서는 안정성 확보를 위해 암반 또는 암주의 미세균열까지도 보강해야 한다. 본 논문에서는 그라우팅 재료의 점도 및 입경, 주입압력, 균열 폭 등을 고려한 미세균열 그라우팅의 주입성능에 대한 연구를 수행하였다. 미세균열 보강에 사용되는 대표적인 그라우팅 재료는 용액형인 약액형 그라우팅 재료와 현탁액형인 시멘트계 그라우팅 재료가 있다. 약액형 그라우팅 재료와 시멘트계 그라우팅 재료의 주입성능은 공통적으로 점도에 영향을 받으며, 시멘트계 그라우팅 재료의 주입성능은 추가적으로 주입 재료의 입경에 영향을 받는다. 실내실험을 통해 점도를 역계산하여 재료별로 적합한 점도 측정 방법을 제시하였고, 균열 폭과 재료의 입경 간의 관계를 이용한 groutability ratio로 시멘트계 그라우팅 재료의 그라우팅 가능여부를 평가하였다.

Keywords

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