Journal
SOILS AND FOUNDATIONS
Volume 54, Issue 2, Pages 233-242Publisher
JAPANESE GEOTECHNICAL SOC
DOI: 10.1016/j.sandf.2014.02.013
Keywords
Pile; Dynamic capacity; Gene expression programming; Training; Validation
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This study presents the development of a new model obtained from the correlation of dynamic input and SPT data with pile capacity. An evolutionary algorithm, gene expression programming (GEP), was used for modelling the correlation. The data used for model development comprised 24 cases obtained from existing literature. The modelling was carried out by dividing the data into two sets: a training set I'm model calibration and a validation set for verifying the generalization capability of the model. The performance of the model was evaluated by comparing its predictions of pile capacity with experimental data and with predictions of pile capacity by two commonly used traditional methods and the artificial neural networks (ANNs) model. It was found that the model performs well with a coefficient of determination, mean, standard deviation and probability density at 50% equivalent to 0.94, 1.08, 0.14, and 1.05, respectively, for the training set, and 0.96, 0.95, 0.13, and 0.93, respectively, for the validation set. The low values of the calculated mean squared error and mean absolute error indicated that the model is accurate in predicting pile capacity. The results of comparison also showed that the model predicted pile capacity more accurately than traditional methods including the,ANNs model. (C) 2014 The Japanese Geotechnical Society. Production and hosting by Elsevier By. All rights reserved.
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