Modelling damping ratio and shear modulus of sand-mica mixtures using genetic programming

Authors:
Abdulkadir Cevik;Ali Firat Cabalar
Affiliations:
Department of Civil Engineering, University of Gaziantep, Gaziantep, Turkey;Department of Civil Engineering, University of Gaziantep, Gaziantep, Turkey
Venue:
Expert Systems with Applications: An International Journal
Year:
2009

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Abstract

This study presents two Genetic Programming (GP) models for damping ratio and shear modulus of sand-mica mixtures based on experimental results. The experimental database used for GP modelling is based on a laboratory study of dynamic properties of saturated coarse rotund sand and mica mixtures with various mix ratios under different effective stresses. In the tests, shear modulus, and damping ratio of the geomaterials have been measured for a strain range of 0.001% up to 0.1% using a Stokoe resonant column testing apparatus. The input variables in the developed NN models are the mica content, effective stress and strain, and the outputs are damping ratio and shear modulus. The performance of accuracies of proposed NN models are quite satisfactory (R^2=0.95 for damping ratio and R^2=0.98 for shear modulus).