Dynamic properties of well-graded sand with silt

Understanding the dynamic properties of soils—particularly their behavior under cyclic or dynamic loading conditions, such as those induced by seismic events or construction activities—is critical for designing resilient geotechnical structures and foundations. This study investigates well-graded sand with silt soils from Astana, Kazakhstan, using the Resonant Column (RC) and Cyclic Torsional Shear (CTS) tests, to characterize their dynamic behavior under varying confining pressures (o𝑐). Although seismic activity in Astana is generally low, aftershocks from distant earthquakes highlight the importance of understanding site-specific seismic risks. This study provides site-specific shear modulus reduction (G) and material damping ratio (D) curves, essential for evaluating seismic hazards and mitigating disasters. These findings address significant gaps in the dynamic characterization of well-graded sand with silt and have practical applications in seismic risk mitigation, foundation design, and urban planning, contributing to safer and more resilient infrastructure in earthquake-prone regions.