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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.
.png) |
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.
graph.png)
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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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