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http://dx.doi.org/10.7843/kgs.2016.32.9.37

Stress Concentration Ratio of GCP Depending on the Mixing Ratio of Crushed Stone and Sand  

Na, Seung-Ju (Dept. of Civil Engrg., Chosun Univ.)
Kim, Min-Seok (Dept. of Civil Engrg., Chosun Univ.)
Park, Kyung-Ho (Dept. of Civil Engrg., Chosun Univ.)
Kim, Daehyeon (Dept. of Civil Engrg., Chosun Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.32, no.9, 2016 , pp. 37-50 More about this Journal
Abstract
Gravel compaction pile (GCP) is widely used as it increases the bearing capacity of soft ground and reduces the consolidation settlement. Stress concentration ratio for GCP design is dependent on the area replacement, surcharge pressure and depth. However, a range of stress concentration ratio obtained through field, laboratory experiments and numerical analysis is large. Little study has been done on the stress concentration ratio for the mixing ratio of gravel and sand. The main objective of the study is to evaluate the stress concentration ratio for both area replacement ratio and mixing ratio through literature review and numerical analysis. Numerical analysis using the finite element program ABAQUS 6.12-4 has been performed for the composite ground with GCP. The excess pore water pressure and stress concentration ratio of composite ground have been analyzed for both the area replacement ratio and the mixing ratio. Based on the previous research results, a range of stress concentration ratio obtained from the field tests, laboratory tests, numerical analysis on the GCP studies is found to be 1.7-3.2, 2.0-7.5 and 2.0-6.5, respectively. Based on the numerical analysis results, as the area replacement ratio increases, the stress concentration ratio increases up to 30% and then decreases at 40%. Also, the stress concentration ratio tends to increase up to 70:30 and then to decrease after 60:40.
Keywords
Area replacement ratio; Excess pore water pressure; GCP method; Mixing ratio; Stress concentration ratio;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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1 Shin, H.Y., Han, S.J., Kim, S.S., and Kim, J.K. (2005), "Behavior of Composite Ground Improved by SCP with Low Replacement Ratio", J. of Korean Society of Civil Engineers, Vol.25, No.6C, pp.369-378.
2 Takeda, N. and Nogawa, H. (1982), "Compressibility of Clay- Containing and Compaction Piles", JSSMFE, Tsuchi-to-Kiso 30(2), pp.47-54.
3 Yoshikuni, H. (1979), "Design and Construction Management of Vertical Drain Method", Soils and Found Series, Gihoudou, Tokyo.
4 Yamaauchi, K. and Hukumoto, K. (1982), "Stress Ratio of a Sand Pile and Cohesive Soil in Composite Ground", 17th JSSMFE Conference, pp.391-394.
5 You, S.K. (2003), "Stress Shearing Behavior and its Mechanism during Consolidation Process of Composition Ground Improved by Sand Compaction Piles with Low Replacement Area Ratio", J. of Korean Geotechnical Society, Vol.19, No.5, pp.301-310.
6 Cho, S.H. (1999), FEM Analysis of Sand Compaction-Pile-Treated Ground, Myunggi University, Master Thesis.
7 Aboshi, H., Yoshikuni, H., and Harada, K. (1970), "$K_0$-consolidation of Clay with Large Sand Pile", 5th Conference of JSSMFE, pp. 379-440.
8 Bae, K.T. and Lee, C.K. (2007), "The Behavior of Rammed Aggregate Piers (RAP) in Soft Gmund(1)", J. of Korean Geotechnical Society, Vol.23, No.4, pp.169-183.
9 Busan New Port Corp. (1999), Report of North Container Terminal, pp.6.50-6.59.
10 Chu, I.C. (2013), A Experimental Study on The Optimum Mixing Ratio of Sand-Mixed Granular Compaction Pile, Hanyang University, Master Thesis.
11 Choi, H.S. (2009), Engineering Properties of Compaction Pile Mixed with Crushed Stone and Sand, Hanyang University, Master Thesis.
12 Hong, E.J. (2002), Analysis of Sand Compaction Piles Under Flexible Surcharge Loadings, Yonsei University, Master Thesis.
13 Choi, J.W., Lee, D.Y., and Yoo, C.S. (2013), "Undrained Characteristics of Geogrid-Encased Stone Column under Cyclic Load Using Reduced- Scale Model Tests", J. of Korean Geotechnical Society, Vol.29, No.1, pp.109-120.   DOI
14 Dassault Systemes (2008), Abaqus Version 6.12 Documentation. Providence, RI: Dassault Systemes.
15 Heo, Y., Zheng, Z.D., Lee, C.K., and Ahn, K.G. (2006), "Centrifuge Modeling on Displacement Shapes of Composite Ground Improved by SCP and GCP", J. of Korean Geo-Environmental Society, Vol. 7, No.5, pp.57-66.
16 Hong, Y.K. (2003), A Study on Characteristics of Bearing Capacity and Stress Concentration of Clay Ground Improved With Sand Compaction Piles, Kangwon National University, Ph.D. Thesis.
17 Ichmoto, E. (1981), "Result of Design and Construction of Sand Compaction Pile Method", 36th JSSMFE Conference 51-55.
18 Jung, J.B. (1999), Study on Consolidation Behavior of Clay Ground Improved by Partly Penetrated Sand Compaction Piles, Hirosima University, Ph. D. Thesis.
19 Jeong, J.W., Lee, S.J., Park, N.W., and Chun, B.S. (2013), "A Numerical Study on the Prevention of Clogging in Granular Compaction Pile", J. of Korean Geo-Environmental Society, Vol.14, No.1, pp.43-51.   DOI
20 Kim, T.W. (2001), Numerical Analysis of The Behavior of Sand Compaction Pile in Clay, Dankook University, Master Thesis.
21 Kim, J.K. (2003), Load Transfer Characteristics of Sand Compaction Piles in Soft Ground, Yonsei University, Ph. D. dissertation.
22 Kim, B.I., Yoo, W.K., Kim, Y.U., and Moon, I.J. (2013), "An Experimental Study on the Behavior of Composite Ground Improved by SCP and GCP with Low Replacement Ratio", J. of the Korea Academia-Industrial, Vol.14, No.2, pp.936-942.
23 Kim, Y.T., Park, H.I., Lee, H.J., and Kim, S.K. (2004), "Analysis of Stress Transfer Mechanism of Composite Ground Reinforced by SCP under Quaywall", J. of Korean Geotechnical Society, Vol.2004, No.2004, pp.227-234.
24 Kim, J.H. (2009), (The) Experimental Study on Composite Ground Behavior and Aspect of Clay Gone Through Compaction Pile of Recycled Aggregate Compaction Piles, Hongik University, Master Thesis.
25 Kim, Y.T. and Ahn, J.H. (2012), "Consolidation Behavior and Stress Concentration Ratio of SCP Composite Ground", Marine georesources & geotechnology, Vol.30, No.1, pp.1064-119X.
26 Lee, K.S. (2000), Finite-Element Modeling of the Stone Column With Varying Cross Section, Myunggi University, Master Thesis.
27 Lee, M.H., Choi, Y.G., Im, J.C., and Hawng, G.B. (2003), "A Study on the Stress Concentration of Crushed-stone Compaction Piles through Field Loading Test", J. of Korean Geotechnical Society, Vol.19, No.6, pp.107-114.
28 Lee, M.H. (2004), A Study on the Load Support Mechanism and Stress Distribution Characteristic of Crushed-Stone Compaction Piles, Busan University, Master Thesis.
29 Lee, C.H., Lim, H.D., and Lee, W.J. (2005), "Finite Element Analysis of GCP Ground with Replacement Ratio", KSCE J. of Civil Engineering, Vol.2005, No.10, pp.5459-5462.
30 Matsuoka, M., Kiga, S., and Harada, K. (1972), "On Characteristics of Settlement of Ground by Improved Vibro-Compozer Method", 7th JSSMFE Conference, pp.391-394.
31 Shin, H.Y. (2005), Analysis on the Behavior of Composite Ground Reinforced by Sand Compaction Pile with Low Area Replacement Ratio, Chungang University, Ph. D. Thesis.
32 Park, Y.W., Kim, B.I., Yoon, G.L., Lee, S.I., Moon, D.J., and Kwon, O.S. (2000), "Behavior Characteristics of a Sand Compaction Pile with Varying Area Replacement Ratio", J. of Korean Geotechnical Society, Vol.16, No.4, pp.117-128.
33 Song, M.G., Bae, W.S., Ahn, S.R., and Heo, Y. (2011), "Centrifugal Model Test on Stress Concentration Behaviors of Composition Ground under Flexible/Stiff Surcharge Loadings", J. of Korean Geo-Environmental Society, Vol.12, No.6, pp.5-15.