Uplift Testing of Model Drilled Shafts in Sand

by Fred H. Kulhawy, (M.ASCE), Assoc. Prof.; School of Civ. and Environmental Engrg., Cornell Univ., Ithaca, N.Y.,
James L. Withiam, (A.M.ASCE), Asst. Project Engr.; D'Appolonia Consulting Engineers, Inc., Pittsburgh, Pa.,
David W. Kozera, (A.M.ASCE), Dist. Engr. for Egypt, Libya, and Saudi Arabia; Raymond International Inc., El Doki-Giza, Egypt,

Serial Information: Journal of the Geotechnical Engineering Division, 1979, Vol. 105, Issue 1, Pg. 31-47

Document Type: Journal Paper


Results of four uplift tests on large-scale cast-in-place straight-sided model drilled shafts in sand are given. The extensive instrumentation and soil placement procedures are described. The results show: (1)A cylindrical shear model describes the tests well; (2)the load-butt deflection response nonlinear, nonlinear and cumulative net compression occurs during loading; and (3)butt deflections at failure are small and consistent. The proposed failure model cosiders an initial at-rest state and active yield during the construction to obtain the failure conditions. Residual capacities are smaller than the ultimate and the percentage decrease increases with increasing initial shear strength .

Subject Headings: Load tests | Failure analysis | Uplifting behavior | Drilled shafts | Shafts | Sandy soils | Shear strength | Failure loads

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