Browsing by Author "Ouanani, Mouloud"

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    BOA based SVR analysis for Predicting the Strength of Subgrade soil for Pavement Design
    (LGCH, 2023) Bouguedra, Billel; Sandjak, Khaled; Ouanani, Mouloud
    This paper introduces a hybrid of the Bayesian optimization algorithm (BOA) and support vector regression (SVR) as a new modelling tool for the California Bearing Ratio (CBR) prediction of subgrade soil for pavement design. For this purpose, an experimental database was utilized to generate the hybrid BOA-SVR model of indirect estimation of the CBR using routinely collected soil properties. The database consists of 238 experimental datasets collected from soil tests carried out in the northern region of Algeria. To develop the model, all hyperparameters were optimised using the BOA technique. It was found that the average, median, standard deviation, minimum, maximum and interquartile range of the expected values of the developed hybrid model are very close to the experimental results. Results revealed that the hybrid BOA-SVR model predict the CBR of the tested subgrade soils with a coefficient of determination of 89% and mean squared error of 5.77. Comparisons with conventional and other machine learning models showed that BOA-SVR hybrid model predictions are more accurate and robust than those of other models
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    Experimental characterisation and numerical modelling of the resilient behaviour of unbound granular materials for roads
    (Université Omar Telidji de Laghouat, 2020) Sandjak, Khaled; Ouanani, Mouloud; Ouanani, Mouloud
    This research paper deals with experimental characterisation and numerical modelling of the resilient behaviour of Unbound Granular Materials (UGMs) usually used in road construction. The first part of thispaper describes the main results of an experimental program that was carried out to assess the mechanical properties of two local Unbound Granular Materials (UGMs) for construction purposes in road pavement. The second part of this paper is devoted to thenumerical modelling of the resilient behaviour of UGMs used in flexible pavements. For this purpose, several nonlinear unbound aggregates constitutive models are implemented within an axi-symmetric finite element code developed to simulate the nonlinear behaviour of pavement structures. In addition, deflection data collected by Falling Weight Deflectometer (FWD) are incorporated into the analysis in order to assess the sensitivity of critical pavement design criteria and pavement design life to the constitutive models. Finally, conclusions of engineering significance are formulated