Effect of Compressive Load on Oblique Pull-out Capacity of Model Piles in Sand

Abstract

Model tests on steel piles embedded in sand were carried out in the laboratory to study the effects of compressive load (i.e. 0, 25, 50, 75, and 100% of their ultimate capacity in compression) on oblique pull-out capacity of piles. The model piles were of 20 mm · 20 mm cross section, which had an embedded length of 400 and 600 mm. The pull was applied at an inclination of 0°, 30°, 60°and 90°with vertical axis of the piles. The experimental results indicate that the net oblique pull-out capacity of piles decreases with increase in % of compressive load and the decrease depends on the magnitude of the compressive load. Semiempirical methods, based on experimental results, have been suggested to determine the oblique pull-out resistance of piles subjected to static compressive loads. A comparison of predicted values of the ultimate oblique resistance by proposed methods of analysis with experimental values, and also with those reported by others, showed reasonably good agreement.

Effect of Compressive Load on Uplift Capacity of Cast-Insitu Bored Piles

“…Extensive theoretical and experimental investigations have been carried out to study the behavior of single piles subjected to compression and uplift load. However, studies on effect of static compressive load on uplift capacity of piles are limited and that to laboratory model tests (Dash and Pise 2003;Joshi and Patra 2004;Krishna and Patra 2006). In the present study an attempt has been made to study the effect of the magnitude of compressive load (0, 25 and 50% of ultimate capacity in compression) on the pull out resistance of cast-in situ bored single piles.…”

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

“…Because of the lack of literature for pile pulling, the theoretical basis of the press pile and uplift piles can be applied for reference. For the uplift piles, Krishna and Patra [16] performed model tests on the uplift loads for the bearing capacity of a single pile in tight sandstone. e experimental results demonstrated that the net uplift capacity decreases with the increase in percentage of the compressive loads [4].…”