Abstract
This study investigates red mud tailings material, employing GCTS cyclic triaxial apparatus to conduct dynamic triaxial tests on red mud, examining its dynamic deformation and strength characteristics under varying consolidation confining pressures and consolidation ratios. Results indicate that with increasing dynamic strain, dynamic stress growth follows a trend of initial rapid increase followed by gradual slowing; the reciprocal of dynamic elastic modulus is negatively correlated with consolidation confining pressure and consolidation ratio; as dynamic shear strain increases, the damping ratio gradually increases, and with continued increase in dynamic shear strain, the damping ratio rises sharply before ultimately stabilizing. Dynamic deformation results demonstrate that the dynamic stress-strain backbone curve and dynamic elastic modulus are positively correlated with consolidation confining pressure and consolidation ratio, while the damping ratio is negatively correlated with consolidation confining pressure and consolidation ratio. Dynamic strength results reveal that higher consolidation confining pressure and consolidation ratio lead to a greater number of cyclic vibration counts required for sample failure, with failure dynamic stress exhibiting a linear relationship with failure cyclic count. The experimental results provide a scientific basis for subsequent treatment and comprehensive utilization of red mud, and hold practical significance for improving tailings dam design and management.
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Experimental Study on the Dynamic Characteristics of Red Mud Tailings Material
Jiang Hu¹, Wang Meng², Chen Pu², Liu Weiwei²
¹ Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China
² North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Abstract
This study investigates the dynamic deformation and strength characteristics of red mud tailings material under varying consolidation confining pressures and consolidation ratios using GCTS cyclic triaxial tests. The results indicate that dynamic stress increases rapidly at first and then gradually slows with increasing dynamic strain. The reciprocal of dynamic elastic modulus is negatively correlated with consolidation confining pressure and consolidation ratio. The damping ratio gradually increases with dynamic shear strain, rising sharply before eventually stabilizing. Dynamic deformation analysis reveals that both the dynamic stress-strain backbone curve and dynamic elastic modulus are positively correlated with consolidation confining pressure and consolidation ratio, while the damping ratio exhibits a negative correlation. Dynamic strength results demonstrate that higher consolidation confining pressure and consolidation ratio require more cyclic loading cycles to reach failure, with a linear relationship observed between failure dynamic stress and failure cyclic count. These findings provide a scientific basis for the subsequent treatment and comprehensive utilization of red mud, offering practical significance for improving tailings pond design and management.
Keywords: Red mud; Tailings material; Dynamic triaxial test; Dynamic characteristic parameters