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http://dx.doi.org/10.7843/kgs.2013.29.11.5

A Study on the Ultimate End Bearing Capacity of Drilled Shafts in Rocks  

Jeong, Sangseom (Dept. of Civil Engrg., Yonsei Univ.)
Lee, Jaehwan (Dept. of Civil Engrg., Yonsei Univ.)
Kim, Dohyun (Dept. of Civil Engrg., Yonsei Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.29, no.11, 2013 , pp. 5-15 More about this Journal
Abstract
The end bearing capacity of rock-socketed drilled shafts under axial loading is investigated by Hoek-cell tests and a numerical analysis. From the test results, it was found that the ultimate end bearing capacity ($q_{max}$) was influenced by pile diameter, rock mass modulus and the spacing of discontinuity. A new ultimate end bearing capacity method is proposed by taking end bearing capacity influence factors, including rock mass discontinuity, based on field data. Through comparisons with other field data, the proposed $q_{max}$ method represents a definite improvement in the prediction of ultimate end bearing capacity of rock-socketed drilled shafts.
Keywords
Ultimate end bearing capacity; Hoek-cell; Numerical analysis (DEM); Rock discontinuity;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 AASHTO (1996), Standard Specifications for Highway Bridges, 16th ED: American Associations of State Highway and Transportation Officials, Washington, D.C.
2 ARGEMA (1992), Design guides for offshore structures : Offshore pile design, ED: P. L. Tirant, Editions Technip, Paris, France.
3 Baquelin, F., Frand, R., and Jezequel, J. F. (1982), "Parameters for friction piles in marine soils", 2nd International Conference in Numerical Methods for Offshore Piling, Austin, April.
4 Carter, J.P. and Kulhawy, F.H. (1988), "Analysis and design of drilled shaft foundations socketed into rock", Final report, EL 5918/ Project 1493-4 / Electric Power Research Institute, Conell Univ., Ithaca, NY.
5 Cho, C. H., Lee, M. H., Yoo, H. K., Kwon, H. G., and Park, E. S. (2003), "The Characterization of Surface Roughness of the Drilled Shaft into Rock", Journal of Korean Geo-environmental Society, Vol.4, No.2, pp.5-13.
6 Cho, H. Y., Jung., S. S., and Seol, H. I. (2009), "End Bearing Load Transfer Behavior of Rock Socketed Drilled Shafts", Journal of Korean Geotechnical Society (KGS), Vol.25, No.8, pp.77-93.   과학기술학회마을
7 Coates, D. F. (1967), Rock Mechanics Principles, Energy Mines and Resources, Ottawa, Canada, Monograph 874.
8 De Beer, E. (1986), "Different behavior of bored and driven piles", Proc. of 6th Danubian Conf. on Soil Mech. and Found. Eng., pp.307-318.
9 Indraratna, B., Haque, A., and Aziz, N. (1998), "Laboratory modeling of shear behaviour of soft joints under constant normal stiffness conditions", Geotechnical and Geological Engineering, Vol.16, pp.17-44.   DOI   ScienceOn
10 Jeong, S. S., Cho, H. Y., Cho, J. Y., Seol, H. I., and Lee, D. S. (2010), "Point bearing stiffness and strength of socketted drilled shafts in korean rocks", International Journal of Rock Mechanics and Mining Sciences, Vol.47, pp.983-995.   DOI   ScienceOn
11 Kim, S. I., Jeong, S. S., Cho, S. H., and Park, I. J. (1999), "Shear load transfer characteristics of drilled shafts in weathered rocks", Journal of Geotechnical and Geoenvironmental Engineering, ASCE, pp.999-1010.
12 Lee, J. H., Cho, H. Y., You, K. H., and Jeong, S. S. (2012), "A Study on the Ultimate Point Resistance of Rock Socketed Drilled Shafts Using FLAC3D and UDEC", Journal of Korean Geotechnical Society (KGS), Vol.28, No.1, pp.29-39.   과학기술학회마을   DOI   ScienceOn
13 Kim, T. J. and Yoo, C. S. (2013), "A Numerical Investigation on End Bearing Capacity of Single Pile Installed in Fractured Rock Mass", Journal of Korean Geotechnical Society (KGS), Vol.29, No.1, pp.61-70.   과학기술학회마을   DOI   ScienceOn
14 Ladanyi, B. and Roy, A. (1971), "Some aspects of bearing capacity of rock mass", Proc. 7th Canadian Symposium on Rock Mechanics, Edmonton, pp.161-190.
15 Lee, H. J. and Lee, H. K. (2006), "An Analysis on the Behavior Characteristics of the Side of Drilled Shafts in Rocks", Journal of Korean Geo-environmental Society, Vol.7, No.6, pp.101-111.
16 O'Neill, M. W. and Hassan, K. M. (1994), "Drilled shaft : effects of construction on performance and design criteria", Proceedings of the International Conference on Design and Construction of Deep Foundations, Federal Highways Administration, Washington D.C., Vol.1, pp.137-187.
17 Reese, L. C. and O'Neill, M. W. (1988), Drilled shafts : Construction procedures and design methods, Publ. No. FHWA-HI-88-042, Federal Highway Administration, Washington, D.C.
18 Rowe, P. K. and Armitage, H. H. (1987), "Theoretical solutions for axial deformation of drilled shafts in rock", Canadian Geotechnical Journal, Vol.24, pp.114-125.   DOI   ScienceOn
19 Seidel, J. P. and Harberfield, C. M. (1994), "A new approach to the prediction of drilled pier performance in rock", Proc. of the International Conf. on Design and Construction of Drilled Pier.
20 Seol, H. I, Jeong, S. S., Cho, C. H., and You, K. H. (2008), "Shear load transfer for rock-socketed drilled shafts based on borehole roughness and geological strength index (GSI)", International Journal of Rock Mechanics and Mining Sciences, Vol.45, pp.848-861.   DOI   ScienceOn
21 Teng, W. C. (1962), Foundation design, Prentice-Hall, Inc, NJ.
22 UDEC (2004), Universal Distinct Element Code, Ver. 4.0, Theory and Background Manual, Itasca Consulting Group, Inc.
23 Vipulanandan et al. (2007) : "Parametric study of open core-hole on the behavior of drilled shafts socketed in soft rock", Proc of Geo-Denver 2007: Denver, Colo. Geotechnical Special Publication 158, pp.1-10.
24 Zhang, L. and Einstein, H. H. (1998), "End bearing capacity of drilled shafts in rock", Journal of Geotechnical and Geoenvironmental Engineering, Vol.124(7), pp.574-584.   DOI   ScienceOn
25 Zhang, L. (2010), "Prediction of end-bearing capacity of rock-socketed shafts considering rock quality designation(RQD)", Canadian Geotechnical Journal, Vol.47, pp.1071-1084.   DOI   ScienceOn