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Geocentrix Repute - Onshore pile design and analysis

Axial loading tests on single piles and pile groups in stiff overconsolidated clay

Reference [1] reports the results of axial loading tests on single piles and pile groups driven into a stiff overconsolidated clay at a site located in Houston, as shown below.

The piles were closed end tubular steel pipes with Young’s modulus of 210GPa, external diameter 274mm, wall thickness 9.3mm, penetration depth of 13.1m, and with a clearance of 0.9m from the groundline.

A non-linear soil model has been adopted within Repute. The soil parameters are based on the data presented in reference [2] i.e. a profile of initial soil modulus of 100MPa at ground level, increasing linearly to 400MPa at the pile base level (as deduced from seismic cross-hole data), and a profile of undrained shear strength of about 40kPa at the surface, increasing linearly to 175kPa at the level of the pile base (as deduced from laboratory triaxial tests).

 


Results from Repute

The results from Repute are shown in the graph below.

Comparison with benchmark

The graph below shows a favourable agreement between the computed and measured load-settlement behaviour for the single pile.

Comments

Further details on this comparison may be found in [3].

Reference

[1] O'Neill, M. W., Hawkins, R. A. & Mahar, L. J. (1982). Load transfer mechanism in piles and pile groups. J. Geotech. Engng, Am. Soc. Civ. Engrs, 108, No. GT12, 1605-1623.

[2] Poulos, H. G. (1989). Pile behaviour-theory and application. 29th Rankine Lecture, Géotechnique, 39, No. 3, 365-415.

[3] Basile, F. (2003). Analysis and design of pile groups. In Numerical Analysis and Modelling in Geomechanics, E & FN Spon (eds J. W. Bull), Chapter 10, in press.

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