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Centrifugal Modelling on the Displacement Mode of Unpropped Diaphragm Wall with Surcharge  

허열 (충북대학교 토목공학과)
이처근 (충남도립 청양대학 토목과)
안광국 ((주)아이콘텍 기술연구소)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.8, 2004 , pp. 135-145 More about this Journal
Abstract
In this study, the behavior of unpropped diaphragm walls on decomposed granite soil was investigated through centrifugal and numerical modelling. Centrifuge model tests were performed by changing the interval distance of surcharge. Excavation was simulated during the centrifuge tests by operating a solenoid valve that allowed the zinc chloride solution to drain from the excavation. In these tests, ground deformation, wall displacement and bending moment induced by excavation were measured. FLAC program which can be able to apply far most geotechnical problems was used in the numerical analysis. In numerical simulation, Mohr-Coulomb model fur the ground model, an elastic model for diaphragm wall were used for two dimensional plane strain condition. From the results of model tests, failure surface was straight line type, the ground of retained side inside failure line had downward displacement to the direction of the wall, and finally the failure was made by the rotation of the wall. The angle of failure line was about 67 ∼ 74$^{\circ}$, greater than calculated value. The locations of the maximum ground settlement obtained from model tests and analysis results are in good agreements. The displacement of wall and the change of the embedment depth is likely to have linear relationship.
Keywords
Centrifugal modelling; Decomposed granite soil; Excavation Surcharge; Unpropped diaphragm wall;
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1 Bolton, M. D. and Stewart, D. I. (1994), 'The Effect on Diaphragm Walls of Rising Groundwater in Stiff Clay', Geo-technique, Vol.44, No.1, pp.111-127
2 Horvath, J. S. (1991), 'Effect of Footing Shape on Behavior of Cantilever Retaining Wall', Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.117, No.6, pp.973-978   DOI
3 Kusakabe, O. (1982), 'Stability of Excavation in Stiff Clays', Ph.D Dissertation, Cambridge University
4 Ou, C. Y., Hsieh, P. G., and Chiou, D. C. (1993), 'Characteristics of Ground Surface Settlement During Excavation', Canadian Geotechnical Journal, Vol.30, No.5, pp.758-767   DOI   ScienceOn
5 Potts, D. M., and Fourie, A. B. (1984), 'The Behaviour of a Propped Retaining Wall : Results of a Numerical Investigation', Geo-technique, Vol.34, No.3, pp.383-404
6 Tedd, P., Chard, B. M., Charles, J. A. and Symons, I. F. (1984), 'Behaviour of a Propped Embedded Retaining Wall in Stiff Clay at Bell Common Tunnel', Geotechnique, Vol.34, pp.513-532   DOI   ScienceOn
7 Powrie, W. (1986), 'The Behaviour of Diaphragm Walls in Clay', Ph.D Dissertation, Cambridge University
8 Richards, D. J., and Powrie, W. (1998), 'Centrifuge Model Tests on Doubly Propped Embedded Retaining Walls in Overconsolidated Kaolin Clay', Geotechnique, Vol.48, No.6, pp.833-846   DOI   ScienceOn
9 Bica, A. V. D., and Clayton, C. R. I. (1998), 'An Experimental Study of the Behaviour of Embedded Lengths of Cantilever Walls', Geotechnique, Vol.48, No.6, pp.731-745   DOI   ScienceOn
10 Fourie, A. B. and Potts, D. M. (1989), 'Comparison of Finite Element and Limit Equilibrium Analyses for an Embedded Cantil-ever Retaining Wall', Geotechnique, Vol.39, No.2, pp.175-188   DOI   ScienceOn
11 Itasca Consulting Group Inc. (1995), 'FLAC Version 3.3', Vol.IIV
12 Powrie, W. (1997), 'Soil Mechanics; Concepts and Applications', E & FN Spon, pp.233-280
13 Hashash, Y. M. A., and Whittle, A. J. (1996), 'Ground Movement Prediction for Deep Excavations in Soft Clay', Journal of Geotechnical and Geoenvironmemal Engineering, ASCE, Vol.122, No.6, pp.474-486   DOI   ScienceOn
14 이처근, 안광국, 허열(2000), '화강토 지반상에 시공되는 Diaph-ragm Wall의 거동에 관한 원심모형 실험', 대한토목학회 논문집, 제20권, 제1-C호, pp.47-57
15 Bolton, M. D. and Powrie, W. (1987), 'Collapse of Diaphragm Walls Retaining Clay', Geotechnique, Vol.37, No.3, pp.335-353   DOI   ScienceOn