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Geomechanics and Engineering Volume 28, Number 4, February25 2022 , pages 397-404 DOI: https://doi.org/10.12989/gae.2022.28.4.397 |
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Development of an optimized model to compute the undrained shaft friction adhesion factor of bored piles |
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Saif Alzabeebee, Ali Adel Zuhaira and Rwayda Kh. S. Al-Hamd
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| Abstract | ||
| Accurate prediction of the undrained shaft resistance is essential for robust design of bored piles in undrained condition. The undrained shaft resistance is calculated using the undrained adhesion factor multiplied by the undrained cohesion of the soil. However, the available correlations to predict the undrained adhesion factor have been developed using simple regression techniques and the accuracy of these correlations has not been thoroughly assessed in previous studies. The lack of the assessment of these correlations made it difficult for geotechnical engineers to select the most accurate correlation in routine designs. Furthermore, limited attempts have been made in previous studies to use advanced data mining techniques to develop simple and accurate correlation to predict the undrained adhesion factor. This research, therefore, has been conducted to fill these gaps in knowledge by developing novel and robust correlation to predict the undrained adhesion factor. The development of the new correlation has been conducted using the multi-objective evolutionary polynomial regression analysis. The new correlation outperformed the available empirical correlations, where the new correlation scored lower mean absolute error, mean square error, root mean square error and standard deviation of measured to predicted adhesion factor, and higher mean, a20 -indexand coefficient of correlation. The correlation also successfully showed the influence of the undrained cohesion and the effective stress on the adhesion factor. Hence, the new correlation enhances the design accuracy and can be used by practitioner geotechnical engineers to ensure optimized designs of bored piles in undrained conditions. | ||
| Key Words | ||
| evolutionary computing; statistical assessment; undrained adhesion factors; undrained shaft capacity | ||
| Address | ||
| Saif Alzabeebee: Department of Roads and Transport Engineering, College of Engineering, University of Al-Qadisiyah, Al-Qadisiyah, Iraq Ali Adel Zuhaira: Technical Institute of Al-Najaf, Al-Furat Al-Awsat Technical University, Iraq Rwayda Kh. S. Al-Hamd: School of Applied Sciences, Abertay University, Dundee, UK | ||