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http://dx.doi.org/10.12652/Ksce.2017.37.1.0083

A Practical Analysis Method for the Design of Piled Raft Foundations  

Song, Young Hun (HDEC Co., Ltd.)
Song, Myung Jun (HDEC Co., Ltd.)
Jung, Min Hyung (KISTEC)
Park, Yung Ho (HDEC Co., Ltd.)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.37, no.1, 2017 , pp. 83-91 More about this Journal
Abstract
In case of estimation of settlement for the piled-raft foundation, it is necessary to consider interaction among raft, piles and soil. But, simple analytic methods usually are not applicable to considering this complicated interaction. In this study, a computer-based approximate analytic method, HDPR, was developed in consideration of above mentioned interaction in order to analysis of settlement for the piled-raft foundation. The finite element method was applied to raft analysis by means of the Mindlin plate theory, and soil and piles were modeled as springs which were connected with their raft. The linear spring which can consider multi layered soil and the non-linear spring were applied to soil springs and pile springs, respectively. The raft-piles-soil interaction was reflected to each spring. In order to verify the developed analytic method, it was compared and analyzed with 3D FEM analysis, existing approximate analytic method and site monitoring data. As a result, the developed analytic method showed reasonable results of settlement estimations of raft and piles for each case. From a practical point of view, it is confirmed that this analytic method is able to apply for analysis and design of the piled-raft foundation.
Keywords
Approximate analytic method; Piled-raft foundation; Settlement; Raft-pile-soil interaction;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Kondner, R. L. (1963). "Hyperbolic stress-strain response: Cohesive Soil." Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 89, No. 1, pp. 115-144.
2 Kuwabara, F. (1989). "An elastic analysis for piled raft foundations in a homogeneous soil." Soils and Foundations, Vol. 28, No. 1, pp. 82-92.
3 Lee, S. H., Park, Y. H. and Song, M. J. (2007). "A practical analysis method for the design of piled raft foundations." Journal of Korean Geotechnical Society, Vol. 23, No. 12, pp. 83-94 (in Korean).
4 Mindlin, R. D. (1936). "Force at a point in the interior of semiinfinite solid." Physics, Vol. 7, No. 5, pp. 195-202.   DOI
5 Ottaviani, M. (1975). "Three-dimensional finite element analysis of vertically loaded pile groups." Geotechnique, Vol. 25, pp. 159-174.   DOI
6 Park, H. I. (2008). "Development of analytical method of piled-raft foundation considering nonlinear behavior of pile." Journal of Korean Geotechnical Society, Vol. 24, No. 10, pp. 17-24 (in Korean).
7 PLAXIS (2012). PLAXIS 3D Reference manual, PLAXIS.
8 Poulos, H. G. (1994). "An approximate numerical analysis of pile-raft interaction." International Journal for Numerical and Analytical Methods in Geomechanics, London, Vol. 18, No. 2, pp. 73-92.   DOI
9 Poulos, H. G., Small, J. C., Ta, L. D., Sinha, J. and Chen, L. (1997). "Comparison of some methods for analysis of piled rafts." Proceedings of The International Conference on Soil Mechanics and Foundation Engineering-International Society for Soil Mechanics and Foundation Engineering, Vol. 2, pp. 1119-1124.
10 Cho, J. Y. and Jeong, S. S. (2012). "Development of three-dimensional approximate analysis method for piled raft foundations." Journal of Korean Geotechnical Society, Vol. 28, No. 4, pp. 67-78 (in Korean).   DOI
11 Clancy, P. and Randolph, M. F. (1993). "An approximate analysis procedure for piled raft foundations." International Journal for Numerical and Analytical Methods in Geomechanics, London, Vol. 17, No. 12, pp. 849-869.   DOI
12 Poulos, H. G. and Davis, E. H. (1980). Pile foundation analysis and design, New York, John Wiley and Sons.
13 Randolph, M. F. (1983). Design of piled foundations, Research Report Soils TR143. Cambridge: Cambridge University Engineering Department.
14 Randolph, M. F. and Wroth, C. P. (1978). "An analysis of the deformation of vertically loaded piles." Journal of Geotechnical Engineering Division, ASCE, Vol. 104, No. 12, pp. 1465-1488.
15 Reul, O. and Randolph, M. F. (2003). "Piled rafts in overconsolidated clay-Comparison of in-situ measurements and numerical analyses." Geotechnique, Vol. 53, No. 3, pp. 301-315.   DOI
16 Schmertmann, J. H. and Hartman, J. P. (1978). "Improved strain influence factor diagrams." Journal of Geotechnical Engineering Division, ASCE, Vol. 104, No. 8, pp. 1131-1135.
17 Ta, L. D. and Small, J. C. (1996). "Analysis of piled raft systems in layered soils." International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 20, No. 1, pp. 57-72.   DOI
18 Zhang, H. H. and Small, J. C. (2000). "Analysis of axially and laterally loaded pile groups embedded in layered soils." Proceedings of 8th Australia NewZealand Conf. on Geomechanics, Hobart, Vol. 1, pp. 475-483.