Browse > Article
http://dx.doi.org/10.7843/kgs.2008.24.9.33

Prediction and Assessment on Consolidation Settlement for Soft Ground by Hydraulic Fill  

Jeon, Je-Sung (KIWE, Korea Water Resources Corporation)
Koo, Ja-Kap (Dept. of Civil Eng., Hankyong National University)
Oh, Jeong-Tae (Yeosu Regional Office, Korea Water Resources Corporation)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.9, 2008 , pp. 33-40 More about this Journal
Abstract
This paper describes the performance of ground improvement project using prefabricated vertical drains of condition, in which approximately 10m dredged fill overlies original soft foundation layer in the coastal area composed of soft marine clay with high water content and high compressibility. From field monitoring results, excessive ground settlement compared with predicted settlement in design stage developed during the following one year. In order to predict the final consolidation behavior, recalculation of consolidation settlements and back analysis using observed settlements were conducted. Field monitoring results of surface settlements were evaluated, and then corrected because large shear deformation occurred by construction events in the early stages of consolidation. To predict the consolidation behavior, material functions and in-situ conditions from laboratory consolidation test were re-analyzed. Using these results, height of additional embankment is estimated to satisfy residual settlement limit and maintain an adequate ground elevation. The recalculated time-settlement curve has been compared with field monitoring results after additional surcharge was applied. It might be used for verification of recalculated results.
Keywords
Consolidation analysis; Consolidation settlement; Dredged fill; Marine clay; Settlement monitoring;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Poindexter, M.E. (1988), Behavior of subaqueous sediment mounds: Effect on dredged material disposal site capacity, Ph.D. Thesis, Texas A&M Univ., College Station, Tex
2 Cargill, K.W. (1984), "Prediction of Consolidation of Very Soft Soil", J of Geotechnical Engineering, ASCE, Vol.110, No.6, pp.775-795   DOI
3 Cargill, K.W. (1985), Mathematical model of the consolidation/ desiccation processes in dredged material, Technical Rep. D-85-4, U.S. Army Engineering Waterways Experiment Station
4 Chu, J, Bo, M.W., Chang, M.F., and Choa, V (2002), "Consolidation and Permeability Properties of Singapore Marine Clay", J Geotechnical and Geoenvironmental Engineering, Vol.128, No.9, pp.724-732   DOI   ScienceOn
5 Terzaghi, K, Peck, R.B., and Mesri, G. (1996), Soil Mechanics in Engineering Practice, 3nd Edition, John Wiley & Sons, New York, pp.71-121
6 Gibson, R.E., Schiffman, R.L. and Cargill K.W. (1981), "The Theory of One-dimensional Consolidation of Saturated Clays II. Finite Nonlinear Consolidation of Thick Homomgeneous Layers", Canadian Geotechnical Journal, Vol.18, pp.280-293   DOI   ScienceOn
7 Mesri, G., and Rokhsar, A. (1974), "Theory of Consolidation for Clays", Journal of the Geotechnical Engineering Division, ASCE, Vol.100, No.GT8, pp.889-904
8 Cousens, T.W., and Stewart, D.I. (2003), "Behavior of a trial embankment on hydraulically placed pfa", Engineering Geology, Vol.70, pp.293-303   DOI   ScienceOn
9 Arulrajah, A, Nikraz, H, and Bo, M.W. (2004), "Observational method of assessing improvement of marine clay", Ground Improvement, Vol.8, No.4, pp.151-169   DOI
10 Choa, V, Bo, M.W., and Chu, J (2001), "Soil improvement works for Changi East Reclamation Project", Ground Improvement, Vol.5, No.4, pp.141-153   DOI
11 Yoo, N.J. (2007), Consolidation Characteristics of Dredged Fill Material Including Centrifuge Test, Research Rep., KSCE, pp.1-117
12 Hansbo, S. (1981), "Consolidation of fine-grained soils by prefabricated drains", 10th Int Conf Soil Mechanics and Found Engineering, Stockholm, Sweden, Vol.3, pp.677-682
13 Stark, T.D., Choi, H., and Schroeder, P.R. (2005), "Settlement of Dredged and Contaminated Material Placement Areas. II: Primary Consolidation, Secondary Compression, and Desiccation of Dredged Fill Input Parameters", J Waterway, port, coastal, and ocean engineering, Vol.131, No.2, pp.52-61   DOI   ScienceOn
14 Tan, S.A. (1993). "Ultimate Settlement by Hyperbolic Plot for Clays with Vertical Drains", J Geotechnical Engineering, Vol.119, No.5, pp.950-956   DOI