Analytical Method for Load-Transfer Characteristics of Rock-Socketed Drilled Shafts
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 6
Abstract
The load-settlement behavior of rock-socketed drilled shafts under axial loading is investigated by a load-transfer approach. Special attention is given to the shear load-transfer function and an analytical method for estimating load-transfer characteristics of rock-socketed drilled shafts. A nonlinear triple curve is employed to determine the shear load-transfer function of rock-socketed drilled shafts based on the constant normal stiffness direct shear tests and the Hoek-Brown failure criterion. An analytical method that takes into account the soil coupling effect was developed using a modified Mindlin’s point load solution. Through comparisons with field case studies, it is found that the proposed methodology in the present study is in good agreement with the general trend observed by in situ measurements and, thus, represents a significant improvement in the prediction of drilled shaft shear behavior.
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References
Abuhejleh, N., O’Neill, M. W., Hanneman, D., and Atwooll, W. J. (2003). “Improvement of the geotechnical axial design methodology for Colorado’s drilled shafts socketed in weak rocks.” CDOT-DTD-R-2003-6 rep., Colorado Dept. of Transportation, Denver.
Baguelin, F. (1982). “Rules for the structural design of foundations based on the self-boring pressuremeter test.” Proc., Symp. on the Pressuremeter and Its Marine Application, IFP, Paris, 347–362.
Boresi, A. P. (1965). Elasticity in engineering mechanics, Prentice-Hall, Englewood Cliffs, N.J.
Carter, J. P., and Kulhawy, F. H. (1988). “Analysis and design of drilled shaft foundations socketed into rock.” Final Rep. No. EL 5918/Project 1493-4, Electric Power Research Institute, Cornell Univ., Ithaca, N.Y.
Castelli, F., Maugeri, M., and Motta, E. (1992). “Analisi non lineare del cedimento di un Palo Singolo.” Riv. Ital. Geotec., 26(2), 115–135.
Coyle, H. M., and Reese, L. C. (1966). “Load transfer for axially loaded piles in clay.” J. Soil Mech. and Found. Div., 92(2), 1–26.
Hoek, E., and Brown, E. T. (1997). “Practical estimates of rock mass strength.” Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 34(8), 1165–1186.
Johnston, I. W. (1994). “Movement of foundations on rock.” Geotechnical Special Publication No. 40, Vertical and Horizontal Deformations of Foundations and Embankments, ASCE, 1703–1717.
Johnston, I. W., Lam, T. S. K., and Williams, A. F. (1987). “Constant normal stiffness direct shear testing for socketed pile design in weak rock.” Geotechnique, 37(1), 83–89.
Kim, S. I., Jeong, S. S., Cho, S. H., and Park, I. J. (1999). “Shear load transfer characteristics of drilled shafts in weathered rocks.” J. Geotech. Geoenviron. Eng., 125(11), 999–1010.
Kwon, O. S. (2004). “Effect of rock mass weathering on resistant behavior of drilled shaft socketed into weathered rock.” Ph.D. thesis, Seoul National Univ.
Kwon, O. S., Choi, Y., Kwon, O. K., and Kim, M. M. (2003). “Load-displacement behavior of cast-in-situ concrete pile by o-cell test.” Proc., Korean Society of Civil Engineers, KSCE, 3342–3347.
Lee, M. H., Cho, C. H., Yoo, H. K., and Kwon, H. K. (2003). “A study on the surface roughness of drilled shaft into rock in Korea.” Proc., Korean Geotechnical Society Conf., KGS, Seoul, 431–438.
Matlock, H., Bogard, D., and Lam., I. (1981). “BMCOL 76: A computer program for the analysis of beam-columns under static axial and lateral loading.” The Earth Technology Co., Long Beach, Calif.
Nam, M. S. (2004). “Improved design for drilled shafts in rock.” Ph.D. thesis, Univ. of Houston.
O`Neill, M. W., and Hassan, K. M. (1994). “Drilled shaft: Effects of construction on performance and design criteria.” Proc., Int. Conf. on Design and Construction of Deep Foundations, 137–187.
Pells, P. J. N., Rowe, R. K., and Turner, R. M. (1980). “An experimental investigation into side shears for socketed piles in sandstone.” Proc., of Int. Conf. on Structural Foundation on Rock, 291–302.
Poulos, H. G., and Davis, E. H. (1968). “The settlement behavior of single axially loaded incompressible piles and piers.” Geotechnique, 18, 351–371.
Samsung, J. V. (2005). “Incheon 2nd bridge project design package no. 3.” Rep., Load Test of Rock Socketed Drilled Shafts, Samsung J. V.
Seidel, J. P., and Collingwood, B. (2001). “A new socket roughness factor for prediction of rock socket shaft resistance.” Can. Geotech. J., 38(1), 138–153.
Seidel, J. P., and Harberfield, C. M. (1995). “Towards an understanding of joint roughness.” Acta Med. Philipp, 28(2), 69–92.
Seol, H. I. and Jeong, S. S. (2007). “Shaft resistance characteristics of rock-socketed drilled shafts based on pile load tests.” J. Korean Geotech. Soc., 23(9), 1–13.
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).” Int. J. Rock Mech. Min. Sci., 45, 848–861.
Taylor, W. H. (1965). Concrete technology and practice, 1st Ed., Angus and Robertson, Sydney, Australia.
Williams, A. F., Johnston, I. W., and Donald, I. B. (1980). “The design of socketed piles in weak rock.” Proc., Int. Conf. on Structural Foundations on Rock, Balkema, Sydney, Australia, 327–347.
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© 2009 ASCE.
History
Received: Jul 18, 2007
Accepted: Sep 4, 2008
Published online: May 15, 2009
Published in print: Jun 2009
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