Two back analyses are discussed of load tests carried out on bentonite slurry piles bored in granular soils. The first case concerns a test on a pile belonging to a 12 pile group. The back analysis permits calibrating an axisymmetric finite element model that reproduces, with reasonable accuracy, the experimental results. The calibrated model is then extended to three-dimensional conditions and applied to the analysis of the entire group. The results suggest some comments on the different assumptions that can be adopted in the calculations and on their effects on the global load-settlement curve of the pile group. The second case concerns a load test in which, in addition to the load-settlement data, also the axial strains along the pile were measured through electrical extensometers. The numerical back analyses highlight an apparent contradiction between the two sets of experimental data. On their bases some conclusions are drawn on the possible causes of the observed inconsistency and on the influence of the construction technology on the soil-pile interaction.
A back analysis of vertical load tests on bored piles in granular soil
CIVIDINI, ANNAMARIA;GIODA, GIANCARLO
2010-01-01
Abstract
Two back analyses are discussed of load tests carried out on bentonite slurry piles bored in granular soils. The first case concerns a test on a pile belonging to a 12 pile group. The back analysis permits calibrating an axisymmetric finite element model that reproduces, with reasonable accuracy, the experimental results. The calibrated model is then extended to three-dimensional conditions and applied to the analysis of the entire group. The results suggest some comments on the different assumptions that can be adopted in the calculations and on their effects on the global load-settlement curve of the pile group. The second case concerns a load test in which, in addition to the load-settlement data, also the axial strains along the pile were measured through electrical extensometers. The numerical back analyses highlight an apparent contradiction between the two sets of experimental data. On their bases some conclusions are drawn on the possible causes of the observed inconsistency and on the influence of the construction technology on the soil-pile interaction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
