Prediction of load transfer curves in pile groups executed in profiles of granular soils from field test measurements

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Publication Title
Prediction of load transfer curves in pile groups executed in profiles of granular soils from field test measurements

Abstract
Load transfer methods are relevant tools for predicting the load-settlement curve in single piles and pile groups. Several experimental studies use instrumentation data to evaluate the load transfer mechanism from the pile to the foundation soil. For pile groups, the load transfer t-z and q-z curves can be approximated to hyperbolic functions for each individual pile, adding the effect of interaction between piles through analytical formulations. Through the collection of data from 13 instrumented grouped piles (driven and bored) executed in granular soils and subjected to static loading tests, this study made predictions of the parameters that describe the hyperbolic t-z and q-z curves from correlations with field test measurements, standard penetration test (SPT) and cone penetration test (CPT), pile geometry, and initial geostatic stresses. The present research found that the parameters that describe the initial stiffness of the t-z and q-z curves have no correlation with field test measurements, unlike the parameters that describe the ultimate resistances. Therefore, in terms of load- settlement curve, the proposals were validated for a group of non-instrumented piles. The validation showed convergence of the load-settlement curve mainly for lower loads. Finally, predictions made from CPT test measurements showed more convergence to the experimental curve.
Authors
D. F. Silva; A. S. Moura

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

C - Risk analysis and safety evaluation

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