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Geocentrix Repute - Onshore pile design and analysis

Lateral load tests on single piles and pile groups

As part of the design of the high-speed rail system in Taiwan, reference [1] reports the results of lateral load tests on single piles and pile groups installed at a site located in Taipao Township, as shown below.

The bored cast-in-situ reinforced concrete piles are 34.9m long, 1.5m in diameter, with a Young’s modulus of 27.6GPa. The group piles were connected by a massive reinforced concrete cap and arranged in a 2x3 configuration with centre-to-centre spacing of three pile diameters, as shown in the inset to the graph to the right. A lateral load of 11MN was applied at the level of the ground surface.

The soil was generally classified as silty sand or silt with occasional layers of silty clay. The soil profile has been idealised as a single cohesionless layer with a friction angle of 30°. A non-linear soil model has been adopted within Repute, and the assumed soil modulus was 77MPa at the level of the pile cap underside, increasing linearly at the rate of 9.5MPa/m.


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-deflection behaviour of the 6-pile group.

Comments

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

Reference

[1] Huang, A. B., Hsueh, C. K., O’Neill, M. W., Chern, S. & Chen, C. (2001). Effects of construction on laterally loaded pile groups. J. Geotech. and Geoenv. Engng, Am. Soc. Civ. Engrs 127, No. 5, 385- 397.

[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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