Prediction of Small-Strain Dynamic Properties on Granulated Spherical Glass Bead-Polyurethane Mixtures

This paper aims to propose predictive equations for the small-strain shear modulus (G_max) and small-strain damping ratio (D_min) of a granulated mixture with plastic and nonplastic materials to reduce the dynamic energy of the ground. Polyurethane bead (PB) and glass bead (GB) were used as the plastic and nonplastic materials, respectively. 180 resonant-column tests were conducted with various conditions affecting the dynamic properties, such as nonplastic particle content (PC), void ratio (e), particle-size ratio (s_r), and mean effective confining pressure (σ'_m). The results showed that G_maxand D_min, respectively, increased and decreased asedecreased with increasingσ'_mof material mixtures. In addition, G_maxdecreased with an increase in PC, whereas D_minincreased. It was also found that s_rof materials affected the changes in G_maxand D_min. With an increase in s_r, G_maxincreased while D_mindecreased because small particles do not hinder the behavior of large particles as the size of larger particles increases. Finally, based on the results, new equations for estimating G_maxand D_minof a granulated mixture with PB and GB were proposed as functions of PC,e, median grain size (D₅₀), andσ'_m.

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