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Centrifuge Model Test on the Bearing Capacity and Failure Mechanism of Composit Ground Improved with Slag Compaction Piles  

Yoo Nam-Jae (Dept. of Civil Eng., Kangwon National Univ.)
Park Byung-Soo (Dept. of Civil Eng., Kangwon National Univ.)
Jeong Gil-Soo (Dept. of Civil Eng., Kangwon National Univ.)
Koh Kyung-Hwan (Samsung Corp.)
Kim Ji-Sung (Samsung Heavy Industries co., Civil Construction Div., Deputy General Manager)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.1, 2005 , pp. 59-67 More about this Journal
Abstract
This paper presents experimental and numerical research results of centrifuge model tests performed to investigate the geotechnical engineering behavior of slag compaction pile as a substitute of sand compaction pile. For centrifuge model tests, bearing capacity of composit soil improved with slag compaction piles, stress concentrations in-between pile and soft clay, settlement characteristics, and failure modes were investigated with slags differing in their relative density. A slag was found to be a good substitute for a sand since the slag compaction pile model showed a greater yield stress intensity up to $30\%$ than the sand compaction pile model under the identical testing conditions. Stress concentration ratio tended to increase with the relative density of slag pile and the clear shear lines in the piles were observed at the depth of $2D{\sim}2.5D$ (D=dia. of model pile) from the top of the piles after loading tests. Numerical analysis with a software of CRISP, implemented with the modified Cam-clay model, was carried out to simulate the results of centrifuge model test. Test results about characteristics of load-settlement curves and stress concentration ratio are in relatively good agreements with numerical estimations.
Keywords
Area replacement ratio; Centrifuge model test; Slag compaction pile; Stress concentration ratio;
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  • Reference
1 김영수, 방인호, 박영화, 차주석, 김건태 (2001), '제강슬래그를 활용한 Stone column 공볍의 현장시험시공 사례연구(III)', 2001 대한토목학회 학술발표대회논문
2 이미혜 (1999), 다짐말뚝 채움재로서 슬래그의 적용성 연구, 명지대학교 대학원 토목공학과 공학석사학위논문
3 Matsuo, M. (1967), 'Stability analysis of clay improved with sand piles', Tsuchi to Kiso, Vol.15, No.12, pp.27-35
4 천병식 (2001), 동제련 슬래그 골재의 토목공사에의 활용, 동제련슬래그의 건설용 골재활용 심포지움, 한국건설기술연구원
5 Hughes, J.M.O. and Withers, N.J. (1974), 'Reinforcing of soft cohesive soils with stone column', Ground Engineering, Vol.7, No.3, May, pp.42-49
6 SAGE CRISP (2000), User's guide and technical reference guide, SAGE Engineering Ltd
7 제강슬래그협회 (2000), 제강슬래그 항만공사용 이용안내서, 포항종합제철
8 해양수산부 (1999), 대수심방파제 및 연약지반 관련기술(II), 해양수산부
9 Masaaki, T. and Masaki, K. (1990), 'Bearing capacity of clay ground improved by sand compaction piles of low replacement area ratio', Report of The Port and Harbour Research Institute, Vol.29, No.2, pp.119-147
10 Roscoe, K. H and Burland, J. B. (1968), 'On the generalized stress-strain behavior of wet clays', Proceedings of Eng., Plasticity, Cambridge, Cambridge University Press, England, pp.535-609