Experimental study on small-strain shear modulus of rubber-clay mixtures
In order to study the dynamic deformation characteristics of rubber-clay mixtures,resonance column tests were conducted on mixtures with different rubber contents,rubber particle sizes,and confining pressures.The development patterns of dynamic shear modulus G and damping ratio λ were analyzed.A calculation method for skeleton void ratio esk expressing the contact state of mixtures was proposed based on the binary medium model.Furthermore,the maximum dynamic shear modulus Gmax of mixtures was evaluated based on skeleton void ratio esk.The results show that adding rubber particles leads to a decrease in G and increase in λ.As the rubber content increases,G decreases and λ increases.Additionally,G increases and λ decreases with increasing confining pressure.Moreover,G increases and λ decreases with increasing rubber particle diameter.With an increase in rubber content,the skeleton void ratio esk increases and Gmax decreases.At the same rubber dosage,as the rubber particle size increases,esk increases and Gmax rises.Based on Hardin's formula,a characterization model of Gmax considering rubber content and rubber particle size is proposed using skeleton void ratio esk.The model exhibits good accuracy and can serve as a basis for evaluating Gmax of rubber-clay mixtures.
rubber-clay mixturesdynamic shear modulusdamping ratioskeleton void ratioHardin model
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