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Acta Geodynamica et Geomaterialia

 
Title: PREDICTIVE MODELS FOR NORMALIZED SHEAR MODULUS AND DAMPING RATIO OF MODELED ROCKFILL MATERIALS
 
Authors: Aghaei Araei Ata and Ghodrati Ahmadreza
 
DOI: 10.13168/AGG.2016.0025
 
Journal: Acta Geodynamica et Geomaterialia, Vol. 14, No. 1 (185), Prague 2017
 
Full Text: PDF file (3.2 MB)
 
Keywords: Normalized Shear Modulus, Damping Ratio, Hyperbolic Model, Nonlinear Multiple Regression Model, Rockfill Material
 
Abstract: This study presents predictive models for estimating normalized shear modulus and damping ratio of three compacted remodeled rockfill materials using modified hyperbolic and nonlinear multiple regression methods. The predictive models uses the results of dynamic triaxial tests carried out on cylindrical samples. Tested materials were obtained from the locations of a number of Concrete Faced Rockfill Dams (CFRDs) constructed in Iran. The laboratory test results show that the shear modulus and especially the damping behavior, are influenced by the frequency of loading. The loading frequency and confining pressure were the most important factors that affect dynamic properties of the rockfill materials. In the preliminary part of this paper, the modified hyperbolic method has been considered for developing the predictive models. The predictions did not have enough precision. There were limitations while selecting γr, the reference shear strain at G/GO=0.5, due to the loading frequency and confining pressure effects. Therefore, results were presented using nonlinear multiple regression approach. The comparison of results shows that the nonlinear multiple regression method is very effective in modeling dynamic properties of soils such as the shear modulus and damping ratio than the classical hyperbolic models.