Raked Piles—Virtues and Drawbacks
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 6
Abstract
This technical note examines some of the characteristics of behavior of pile groups containing raked piles, via a simplified and hypothetical example. Three cases are examined: (1) a group subjected to vertical and lateral loadings, with no ground movements; (2) a group subjected to vertical and lateral loadings, but with vertical ground movements also acting on the group; and (3) a group subjected to vertical and lateral loadings, but with horizontal ground movements acting on the group. In each case, the effect of pile rake on typical behavioral characteristics (group settlement, lateral deflection and rotation, and pile loads and moments) are examined. It is found that, while the presence of raked piles can provide some advantages when the group is subjected to applied vertical and lateral loadings, especially in relation to a reduction in lateral deflection, some aspects of group behavior may be adversely affected when either vertical or horizontal ground movements act on the group. Thus, caution must be exercised in employing raked piles when such ground movements are expected to occur.
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Acknowledgment
The writer gratefully acknowledges the constructive comments of Patrick K. Wong.
References
Poulos, H. G. (1980). DEFPIG users’ manual, Centre for Geotechnical Research, Univ. of Sydney, Sydney, Australia.
Poulos, H. G. (1993). “Piled rafts in swelling or consolidating soils.” J. Geotech. Eng., 119(2), 374–380.
Poulos, H. G. (1999). “Approximate computer analysis of pile groups subjected to loads and ground movements.” Int. J. Numer. Analyt. Meth. Geomech., 23, 1021–1041.
Randolph, M. F. (1987). “PIGLET, a computer program for the analysis and design of pile groups.” Report GEO 86033, Dept. Civil Engineering, Univ. of Western Australia, Perth, Australia.
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© 2006 ASCE.
History
Received: May 2, 2005
Accepted: Sep 9, 2005
Published online: Jun 1, 2006
Published in print: Jun 2006
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