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Prediction of rockfill materials’ shear strength using various kernel function-based regression models—a comparative perspective

Ahmad, Mahmood and Al-Mansob, Ramez and Jamil, Irfan and Al-Zubi, Mohammad A. and Sabri, Mohanad Muayad Sabri and Alguno, Arnold C. (2022) Prediction of rockfill materials’ shear strength using various kernel function-based regression models—a comparative perspective. Materials, 15 (5). pp. 1-15. E-ISSN 1996-1944

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The mechanical behavior of the rockfill materials (RFMs) used in a dam’s shell must be evaluated for the safe and cost-effective design of embankment dams. However, the characterization of RFMs with specific reference to shear strength is challenging and costly, as the materials may contain particles larger than 500 mm in diameter. This study explores the potential of various kernel function-based Gaussian process regression (GPR) models to predict the shear strength of RFMs. A total of 165 datasets compiled from the literature were selected to train and test the proposed models. Comparing the developed models based on the GPR method shows that the superlative model was the Pearson universal kernel (PUK) model with an R-squared (R2 ) of 0.9806, a correlation coefficient (r) of 0.9903, a mean absolute error (MAE) of 0.0646 MPa, a root mean square error (RMSE) of 0.0965 MPa, a relative absolute error (RAE) of 13.0776%, and a root relative squared error (RRSE) of 14.6311% in the training phase, while it performed equally well in the testing phase, with R2 = 0.9455, r = 0.9724, MAE = 0.1048 MPa, RMSE = 0.1443 MPa, RAE = 21.8554%, and RRSE = 23.6865%. The prediction results of the GPR-PUK model are found to be more accurate and are in good agreement with the actual shear strength of RFMs, thus verifying the feasibility and effectiveness of the model.

Item Type: Article (Journal)
Additional Information: 10283/97002
Uncontrolled Keywords: shear strength; rockfill materials; Gaussian functions; polynomial kernel; radial basis function; Pearson universal kernel
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA170 Environmental engineering. Sustainable engineering
T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials of engineering and construction
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Civil Engineering
Kulliyyah of Engineering
Depositing User: Dr. Ramez Al-Mansob
Date Deposited: 03 Mar 2022 08:31
Last Modified: 03 Mar 2022 08:31
URI: http://irep.iium.edu.my/id/eprint/97002

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