Experimental study on dynamic characteristics of tailings under different consolidation conditions

Abstract

Abstract The objective of this study is to investigate the dynamic characteristics of tailings sand under different consolidation conditions. Through consolidated undrained triaxial tests under different dry densities, consolidation ratios and containing pressures, the dynamic shear stress, liquefaction stress ratio, dynamic strength index, dynamic pore water pressure, dynamic modulus and damping ratio of tailings sand under different consolidation conditions were analyzed. The test results show that: The dynamic shear stress of tailings sand is linear with the number of failure vibration. The influence of consolidation ratio on liquefaction stress ratio is obvious. The two correspond to a quadratic polynomial passing through the origin. The influence of consolidation ratio on dynamic internal friction angle is greater than that of dry density. The change of dynamic shear modulus ratio and damping ratio with dynamic strain is obviously influenced by consolidation ratio. The variation law of reference shear stress under different conditions is basically in accordance with normal distribution. The research results can serve as a theoretical reference for seismic liquefaction of a tailings dam in areas of high intensity seismic activity.