Helical Anchors in Dry and Submerged Sand Subjected to Surcharge
Publication: Journal of Geotechnical Engineering
Volume 117, Issue 10
Abstract
The influence of surcharge and submersion of sand on the uplift performance of a single helical screw anchor is presented. An experimental investigation is conducted on shallow anchors installed in dense dry and submerged sands subjected to a surcharge intensity of 7.35 kN/m2. Test results are compared to those of anchors installed in sands with free surface. The application of a surcharge on the sand surface results in an increase in the uplift capacity of shallow anchors. For both dry and submerged sands, the contribution of the surcharge to the uplift capacity decreases with the increase of the embedment depth of the anchor. A normalized factor is established to express the applied surcharge in terms of the acting overburden pressure. Nondimensional equations of the parameters affecting the uplift capacity and the intensity of the applied surcharge were proposed. It has been shown that the negative effect of submersion on the anchor's pullout capacity can be offset by applying surcharge on the sand surface.
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References
1.
Ghaly, A. M. (1986). “Screw pile, its uses to resist uplift pressures due to seepage,” thesis presented to Alexandria University, Alexandria, Egypt, in partial fulfillment of the requirements for the degree of Master of Science.
2.
Ghaly, A. M., Hanna, A. M., and Hanna, M. S. (1991). “Uplift behavior of screw anchors in sand. II: Hydrostatic and flow conditions.” J. Geotech. Engrg., ASCE, 117(5), 794–808.
3.
Hanna, T. H., and Carr, R. W. (1971). “The loading behavior of plate anchors in normally and overconsolidated sands.” Proc. 4th Budapest Conf. on Soil Mech. and Found. Engrg., Section of Technical Sciences, Hungarian Academy of Sciences, 589–600.
4.
Hanna, T. H., and Sparks, R. (1973). “The behavior of preloaded anchors in normally consolidated sands.” Proc. 8th Int. Conf. on Soil Mech. and Found. Engrg., U.S.S.R. National Society for Soil Mechanics and Foundation Engineering, 2, 137–142.
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Copyright © 1991 ASCE.
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Published online: Oct 1, 1991
Published in print: Oct 1991
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