MODEL TESTS FOR UPLIFT RESISTANCE OF PILES IN SAND

Citation
Ai. Almhaidib et Tb. Edil, MODEL TESTS FOR UPLIFT RESISTANCE OF PILES IN SAND, ASTM geotechnical testing journal, 21(3), 1998, pp. 213-221
Citations number
19
Categorie Soggetti
Engineering, Geological","Geosciences, Interdisciplinary
ISSN journal
01496115
Volume
21
Issue
3
Year of publication
1998
Pages
213 - 221
Database
ISI
SICI code
0149-6115(1998)21:3<213:MTFURO>2.0.ZU;2-J
Abstract
An experimental program using large model piles in sand was conducted to study the shaft resistance behavior of piles subject to uplift load s. Model single pipe piles of different diameters (45 to 178 mm) were subjected to static uplift loading to failure. The piles, which had an embedded length of about 1.7 to 2 m, were installed in a large test p it (3 by 3 by 3 m) by three different methods (driving, jacking, and a reference undisturbed method with negligible lateral displacement) to assess the influence of method of installation on shaft resistance. T he tests were performed in two initial densities of a sand (loose and dense). The experimental results were analyzed statistically. The resu lts show that the initial sand density and the method of pile installa tion are the most significant factors that affect uplift capacity. Ins tallation methods that cause less disturbance give higher uplift capac ity. Unit shaft resistance could be reduced as much as by half dependi ng on the method of pile installation relative to the undisturbed meth od. The displacement at the ultimate uplift load is in the range of 5 to 12.5 mm and independent of soil type and pile diameter, but depends on method of pile installation.