Gaussian Process Regression (GPR) for Auto-Estimation of Resilient Modulus of Stabilized Base Materials

Document Type : Regular Article


1 Associate Professor, Department of Civil Engineering, Sirjan University of Technology, Sirjan, Iran

2 Research Assistant, Department of Civil Engineering, Sirjan University of Technology, Sirjan, Iran

3 School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran


The resilient modulus of different pavement materials is one of the most important parameters for the pavement design using the mechanistic-empirical (M-E) method. The resilient modulus is generally determined by a triaxial test, which is expensive and time-consuming and requires special laboratory facilities. This study aims to develop a model based on the Gaussian Process Regression (GPR) to predict the resilient modulus of stabilized base material with different additives under wetting-drying cycles. For this purpose, a laboratory dataset containing 704 records have been used. The input parameters were considered as the wetting-drying cycles, free lime to silica ratio, Alumina and iron oxide compounds in the additives, maximum dry density to optimum moisture content ratio, deviator stress, and confining stress. The results indicate high accuracy of the GPR method with a regression coefficient of 0.997 and 0.986 respectively for train and test data and 0.995 for all datasets. Comparing the developed model based on the GPR method with the developed models in the literature based on the artificial neural network methods and the support vector machines shows higher accuracy of the GPR method.


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