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Components of suction caisson capacity measured in axial pullout tests
Components of suction caisson capacity measured
in axial pullout tests
Adam M. Lukea, Alan F. Rauchb, Roy E. Olsonc,*,
Elliott C. Mechamd
aGroundwater Services, Inc., 2211 Norfolk, Suite 1000, Houston, TX 77098, USA
bFuller Mossbarger Scott May Engineers, Inc., 1409 North Forbes Road, Lexington, KY 40511, USA
cDepartment of Civil Engineering, The University of Texas at Austin, 1 University Station C1792,
Austin, TX 78712, USA
dFoundation Engineering, 7420 SW Hunziker Road, Suite A, Portland, OR 97223, USA
Available online 15 December 2004
Abstract
Suction caissons are the foundation of choice for offshore structures in deep water. Systematic
study of caisson behavior is relegated to the laboratory due to the high cost of full-scale testing. Our
laboratory caisson was installed in normally consolidated clay using dead weight and suction.
Tensile axial capacity was measured with the top cap vented or sealed, and with the soil undrained or
drained. For the common case of rapid pullout with a sealed top, the test results indicate an external
side resistance factor (a) of 0.5–0.8 and a reverse end bearing factor (Nc) of 13–21.
q 2004 Elsevier Ltd. All rights reserved.
Keywords: Suction caissons; Offshore foundations; Pullout capacity; Tensile loading; Prototype tests; Normally
consolidated soil
1. Introduction
A suction caisson is a closed-top steel tube that is lowered to the seafloor, allowed to
penetrate the bottom sediments under its own weight, and then pushed to full depth with
differential pressure produced by pumping water out of the interior. Suction caissons are
an attractive alternative for providing anchorage for offshore facilities because they can beOcean Engineering 32 (2005) 878–891/locate/oceaneng0029-8018/$ - see front matter q 2004 Elsevier Ltd. All rights reserved.
doi:10.1016/j.oceaneng.2004.10.007
* Corresponding author.
E-mail addresses: amluke@ (A.M. Luke), arauch@ (A.F. Rauch), olson@
(R.E. Olson), mechamec@ (E.C. Mecham).
A.M. Luke et al. / Oc
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