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Geomechanics and Engineering Volume 32, Number 6, March25 2023 , pages 583-600 DOI: https://doi.org/10.12989/gae.2023.32.6.583 |
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Ensemble deep learning-based models to predict the resilient modulus of modified base materials subjected to wet-dry cycles |
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Mahzad Esmaeili-Falak and Reza Sarkhani Benemaran
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| Abstract | ||
| The resilient modulus (MR) of various pavement materials plays a significant role in the pavement design by a mechanistic-empirical method. The MR determination is done by experimental tests that need time and money, along with special experimental tools. The present paper suggested a novel hybridized extreme gradient boosting (XGB) structure for forecasting the MR of modified base materials subject to wet-dry cycles. The models were created by various combinations of input variables called deep learning. Input variables consist of the number of W-D cycles (WDC), the ratio of free lime to SAF (CSAFR), the ratio of maximum dry density to the optimum moisture content (DMR), confining pressure (o3), and deviatoric stress (od). Two XGB structures were produced for the estimation aims, where determinative variables were optimized by particle swarm optimization (PSO) and black widow optimization algorithm (BWOA). According to the results' description and outputs of Taylor diagram, M1 model with the combination of WDC, CSAFR, DMR, o_3, and o_d is recognized as the most suitable model, with R^2 and RMSE values of BWOA-XGB for model M1 equal to 0.9991 and 55.19 MPa, respectively. Interestingly, the lowest value of RMSE for literature was at 116.94 MPa, while this study could gain the extremely lower RMSE owned by BWOA-XGB model at 55.198 MPa. At last, the explanations indicate the BWO algorithm's capability in determining the optimal value of XGB determinative parameters in M_R prediction procedure. | ||
| Key Words | ||
| extreme gradient boosting; modified base materials; predicting; resilient modulus; wet-dry cycles | ||
| Address | ||
| Mahzad Esmaeili-Falak: Department of Civil Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran Reza Sarkhani Benemaran: Department of Civil Engineering, Faculty of Geotechnical Engineering, University of Zanjan, Zanjan, Iran | ||