Model Pile Pull-Out Tests Using Polyethylene Sheets to Reduce Downdrag on Cast In Situ Piles

Experiments regarding single model piles embedded in organic soil were conducted to determine the effect of pile type and soil density on ultimate pile oblique pull-out loads. Wood, steel, and smooth as well as rough concrete piles with diameters of 20 mm and embedment lengths of 200, 400, and 600 mm (length-to-diameter ratio L/D of 10, 20, and 30) were examined. The pull load was applied at an inclination of 0°, 30°, 60°, and 90° to the vertical axis of the pile. For each inclination angle, ultimate pull-out capacity was determined from load-displacement curves. Test results indicate that ultimate pull-out capacity increased with an increase in L/D ratio. While there was an increase in the pull-out load resistance of wood, steel, and smooth concrete piles when the angle of load inclination increased, there was a decrease in the pull-out load resistance of rough concrete piles when the load inclination angle exceeded 30°. Moreover, ultimate load capacity decreased when soil density decreased. Lateral pull-out capacity exceeded the axial uplift capacity of the steel, wood, and smooth concrete piles, and there was a slight increase in the ultimate load capacity of the rough concrete pile. The ultimate resistance of the piles was calculated theoretically via a semiempirical method and compared with test results. A comparison of the measured and predicted values indicated reasonable agreement pertaining to rough concrete piles and a disconnect regarding the other piles.

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Model Pile Pull-Out Tests Using Polyethylene Sheets to Reduce Downdrag on Cast In Situ Piles

Cited by 2 publications

References 7 publications

A Rapid Field Soil Characterization System

A Rapid Field Soil Characterization System

Analysis of Vertical Piles Embedded in Organic Soil under Oblique Pull-Out Load

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