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Geocentrix Repute - Onshore pile design and analysis

Axial loading tests on driven piles in medium dense sand

Reference [1] describes the results of axial loading tests on a group of five driven piles in medium dense sand at a site located in San Francisco, as shown below.

The piles were tubular steel pipes with Young’s modulus of 160GPa, external diameter 273mm, wall thickness 9.3mm, driven to a depth of 9.15m through a 300mm diameter hole predrilled to a depth of 1.4m. The piles were arranged in the configuration shown in the inset to the graph to the right, and connected by a rigid cap with a clearance of 0.6m from the ground level.

The soil profile consists of medium dense sand, overlain by 1.4m of sandy gravel and underlain by bedrock at a depth of 14.3m below ground level. The water table is 2.4m deep.

A non-linear soil model has been adopted within Repute. The assumed soil parameters are based on a subsoil idealisation with two layers resting on a rigid base, as shown on the diagram to the left. Considering that the predrilled hole disconnects the piles from the top 1.4m of gravelly soil, the ground level (GL*) used within Repute is taken at 1.4m below the actual ground level (GL). Thus, the embedded length of piles will be taken as 7.75m, and the free-standing length as 2m (i.e. 1.4 + 0.6m).


Results from Repute

The results from Repute are given in the graph below.

Comparison with benchmark

The computed and measured load-settlement curves are reported in the graph below and show a good agreement.

Comments

Further details on this comparison may be found in [2].

Reference

[1] Briaud, J. L., Tucker, L. M. & Ng, E. (1989). Axially loaded 5 pile group and single pile in sand. Proc. 12th Int. Conf. Soil Mech. Fdn Engng, Rio de Janeiro 2, 1121-1124.

[2] 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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