폐색효과를 고려한 사질토의 시멘트 침투 그라우팅 거동 특성

• Seo, Jong-Woo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
• Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
• Kim, Byung-Kyu (School of Civil, Environmental and Architectural Engineering, Korea University) ;
• Kwon, Young-Sam (School of Civil, Environmental and Architectural Engineering, Korea University)
• 서종우 (고려대학교 건축사회환경공학부) ;
• 이인모 (고려대학교 건축사회환경공학부) ;
• 김병규 (고려대학교 건축사회환경공학부) ;
• 권영삼 (고려대학교 건축사회환경공학부)
• Accepted : 2018.03.08
• Published : 2018.03.31

Abstract

The behavior of cement-based permeation grouting is divided into three different groups depending on the grain size distribution of the soils: (1) zone of cement-based permeation grouting not feasible; (2) zone of cement-based permeation grouting feasible; and (3) zone in which an accelerating agent should be added to limit the penetration depth. In the cement-based permeation grouting feasible zone, the concept of a representative pore radius was proposed. The ratios of the representative pore radius to the mean pore radius were obtained by performing laboratory test and comparing with clogging theory; these values were in the range of 1.07 and 1.35 depending on the grain size distribution of the soils. In addition, a functional relationship between the lumped parameter (${\theta}$), the representative pore radius and the w/c ratio were derived by comparing and matching experimental results with predictions from theory. In the zone in which the accelerating agent should be added, the controlling process of gel time to limit the penetration depth was experimentally verified. The test results matched well with those obtained from theory utilizing the developed grout penetration program on condition that the viscosity increasing tendency of grout suspension with time is properly taken into account.

Acknowledgement

Grant : 고수압 초장대 해저터널 기술자립을 위한 핵심요소 기술개발

Supported by : 국토교통부

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