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Selection of load-transfer functions for passive lateral loading of pile groups (M.F. Bransby, S.M. Springman)

Abstract:

A finite element study has been carried out to determine the pile-soil-pile interaction behaviour for closely spaced pile rows and groups under passive lateral loading from soil movement. A horizontal section close to the piles was studied to determine the effects of pile spacing and soil constitutive law on the load-transfer relationships of the piles. The study has revealed links between the soil stress-strain law, the soil deformation mechanism and the pile load-transfer curves. Interaction behaviour was seen to depend on the prevailing deformation mechanism which in turn was governed by the soil constitutive law. Elastic-plastic and power law soil models were applied. Interaction factors suitable for design use to account for increasing lateral pressure on piles during passive lateral loading have been produced for a range of pile spacings and power law soil exponents. Interaction between piles increased both with reduction of pile spacing and with increase of soil exponent - the less soil stiffness degradation with shear strain, the greater the interaction between piles at a given spacing. This suggests that the passive interaction factors calculated using elastic methods are likely to overestimate the effects of pile-soil-pile interaction.

Authors:

Springman, Sarah M.

Index Terms:

Soil; lateral loading; SoilGroup; Springman, Sarah M.

Further Information:

Date published: 1999