Abstract:To explore the link between dynamic modulus and damping modulus of tailings sand, taking into account its fines content, the samples were conditioned under a specified dry density and isobaric consolidation, across different cyclone classification scenarios. This analysis sought to clarify how fines content affects the dynamic and damping behaviors of tailings sand, resonance column tests were conducted on unsaturated tailings sand samples with different fines contents. Test results indicated that at the same fines content, the maximum value of the dynamic shear modulus follows the law of variation of the ambient pressure. At the same pressure, the maximum dynamic shear modulus of the tailings sand showed a decreasing trend with increasing fines content, indicating that fines content has a certain effect on the shear damage resistance of the tailings sand. At the same fines content, the maximum damping modulus of the three tailings sands decreased with increasing ambient pressure. Due to the critical fines content, the maximum attenuation coefficients of the tailings sands tend to increase and then decrease with a gradual increase in fines content. The study′s outcomes furnish essential information for evaluating how tailings with varying fines content respond dynamically. These insights form a cornerstone for designing and managing intermediate tailings ponds in earthquake-prone areas.
