Creep Response of Model Pile in Clay
Publication: Journal of Geotechnical Engineering
Volume 114, Issue 11
Abstract
The shaft creep response of a model pile inserted in a specimen of clay is studied under constant pile loads at varying percentages of the ultimate shaft resistance. The top and lateral surfaces of the clay specimen could deform freely. The specimens were consolidated under varying vertical and horizontal effective stress combinations. The results of the tests using eight normally consolidated clay specimens with three different thicknesses and steel model piles of three different diameters and of smooth and rough surfaces show that the total displacement of a friction pile consists of a relatively small immediate displacement followed by a significant time‐dependent shaft creep. The immediate settlement was mostly elastic and recoverable upon reloading. Consolidation of the clay due to load transfer from the axially loaded pile was negligible, as negligible volume change was recorded during constant pile load tests. The time‐dependent displacement of the pile is attributed primarily to the slip between the pile and the soil. The rate of the slip displacement is found to continuously decrease with time. A parabolic equation is found to represent the creep response best. The creep response as characterized by the parameters of this relationship is dependent on the load ratio (ratio of the axial load to the ultimate shaft resistance) and the pile diameter for a given pile‐soil system; however, it is independent of surface roughness and the state of soil stresses. The horizontal effective stresses in the clay determines the shaft resistance and, therefore, the load ratio for a given axial load.
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References
1.
Bishop, A. W. (1966). “The strength of soils as engineering materials.” Geotechnique, 16, 91–128.
2.
Bromham, S. B., and Styles, J. R. (1971). “An analysis of pile loading tests in a stiff clay.” Proc. First Autralian‐New Zealand Conf. on Geomechanics, Melbourne, Australia, Vol. 1, 256–253.
3.
Cambefort, H., and Chadeisson, R. (1961). “Critere pour l'evaluation de la force portante d'un pieu.” Proc. 5th Int. Conf. on Soil Mechanics and Foundation Engineering, Vol. 2, 23–31 (in French).
4.
Krizek, R. J., Chawla, K. S., and Edil, T. B. (1977). “Directional creep response of anistropic clays.” Geotechnique, 27(1), 37–51.
5.
Marquardt, D. W. (1963). “An algorithm for least squares estimation of non‐linear parameters.” J. Soc. Ind. Appl. Math., 11(2), 431–441.
6.
Mitchell, J. K. (1964). “Shearing resistance of soils as a rate process.” J. Soil Mech. and Found. Div., ASCE, 90(SM1), 29–61.
7.
Mitchell, J. K., Campanella, R. G., and Singh, A. (1968). “Soil creep as a rate process.” J. Soil Mech. and Found. Div., ASCE, 94(SM1), 231–253.
8.
Mochtar, I. B. (1985). “An experimental study of skin friction and creep of piles in clay,” thesis presented to Department of Civil and Environmental Engineering, at the University of Wisconsin, at Madison, Wis., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
9.
Mochtar, I. B., and Edil, T. B. (1988). “Skin friction of model pile in clay.” J. Geotech. Engrg., ASCE, 114(11), 1227–1244.
10.
Murayama, S. (1969). “Effect of temperature on elasticity of clays.” Special Report No. 103, Highway Research Board, 194–203.
11.
Murayama, S., and Shibata, T. (1960). “The bearing capacity of a pile driven into soil and its new measuring method.” Soil Found., 1(2), 2–11.
12.
Poulos, H. G., and Davis, E. H. (1968). “The settlement behavior of single axiallyloaded incompressible piles and piers.” Geotechnique, 18, 351–371.
13.
Poulos, H. G., and Davis, E. H. (1980). Pile foundation analysis and design. Series in Geotechnical Engineering, Lambe and Whitman, eds., John Wiley and Sons, Inc., New York, N.Y.
14.
Scarborough, J. B. (1930). Numerical mathematical analysis. The Johns Hopkins Press, Baltimore, Md.
15.
Sharman, F. A. (1961). “The anticipated and observed penetration resistance of some friction piles entirely in clay.” Proc. 5th Int. Conf. on Soil Mechanics and Foundation Engineering, Paris, France, Vol. 2, 135–141.
16.
Singh, A. (1966). “Creep phenomena in soils,” thesis presented to the Department of Civil Engineering, University of California, at Berkeley, Calif., in partial fulfillment of the the requirements for the degree of Doctor of Philosophy.
17.
Singh, A., and Mitchell, J. K. (1968). “General stress‐strain‐time function for soils.” J. Soil Mech. and Found. Div., ASCE, 94(SM1), 21–46.
18.
Vesic, A. S. (1977). “Design of pile foundations.” Synthesis of Highway Practice No. 42, National Cooperative Highway Research Program, Transportation Research Board, National Research Council, Washington, D.C.
19.
Vyalov, S. S., and Meschyan, S. R. (1969). “Creep and long term strength of soils subjected to variable load.” Proc. 7th Int. Conf. on Soil Mechanics and Foundation Engineering, Mexico City, Mexico, Vol. 1, 423–431.
20.
Whitaker, T., and Cooke, R. W. (1966). “An investigation of the shaft and base resistances of large bored piles in London clay.” Proc. Symp. on Large Bored Piles, Institute of Civil Engineers, London, U.K., 7–50.
21.
Yamagata, K. (1963). “The yield‐bearing‐capacity of bearing piles.” Proc. Int. Conf. on Soil Mechanics and Foundation Engineering, Budapest, Hungary, 325–342.
22.
Zaretskii, Y. K. (1967). Theory of soil consolidation. Izdatel'stvo Nauka, Moscow, U.S.S.R.
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Copyright © 1988 ASCE.
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Published online: Nov 1, 1988
Published in print: Nov 1988
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