Safety and Reliability

Laterally Loaded Piles With Bulge

[+] Author and Article Information
Jan Dührkop

Institute of Geotechnical and Constructional Engineering,  Hamburg University of Technology, 21079 Hamburg, Germanyj.duehrkop@tu-harburg.de

Jürgen Grabe

Institute of Geotechnical and Constructional Engineering,  Hamburg University of Technology, 21079 Hamburg, Germanygrabe@tu-harburg.de

J. Offshore Mech. Arct. Eng 130(4), 041602 (Sep 26, 2008) (5 pages) doi:10.1115/1.2904589 History: Received July 11, 2007; Revised November 21, 2007; Published September 26, 2008

This paper contains several investigations on the behavior of bulged piles. Bulge means the application of vertical steel plates somewhere near the ground surface to improve the lateral bearing capacity. The results of small scale tests in sand are illustrated, which demonstrate the effectiveness of such bulge. Some theoretical investigations are presented trying to apply standard methods like the py-curve procedure to the design of bulged piles. An outline of possible calculation methods is given. Investigations on two different exemplary pile systems demonstrate the behavior of the bulged structure and give an idea of the advantages of this innovative system.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Sketch of a bulged pile

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Figure 2

Test device for small scale tests

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Figure 3

Effect of different wings on load-displacement curves

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Figure 4

Effect of a bulge on soil behavior near the ground surface

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Figure 5

Statics of a bulged pile

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Figure 6

Effect of wing depth on bearing capacity (left); assumed passive earth pressure for soil 1 (right)

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Figure 7

Determination of spring stiffness k from p‐y-curves

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Figure 8

Effect of ratio A∕Amax and wing type on pile head deflection

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Figure 9

Effect of wing size and soil stiffness on required pile length



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