Analysis of dynamic deformation characteristics of tailings silty clay under different consolidation conditions
Using the GDS vibration triaxial test system,for the tailings silty clay in a tailings pond in Sichuan Province,a vibration triaxial test was carried out based on different consolidation conditions to study the deformation characteristics of the tailings silty clay under graded cyclic loading.The changes of dynamic deformation characteristic parameters of tailings silty clay under different consolidation conditions were compared and analyzed.The results show that when the consolidation confining pressure σ3 and consolidation ratio Kc increase continuously,the dynamic deformation parameters of tailings silty clay show obvious different trends,the damping ratio λ will continue to decrease,and the dynamic elastic modulus Ed and the dynamic shear modulus Gd keeps increasing;when the dynamic strain εd increases,the damping ratio λ will increase accordingly,but the dynamic elastic modulus Ed and the dynamic shear modulus Gd decrease significantly.The ratio Ed/Edmax gradually decreases,indicating that the dynamic elastic modulus gradually decays,and the decay process is three-stage;the increase of consolidation pressure σ3 and consolidation ratio Kc can slow down the decay of dynamic elastic modulus Ed.The Shen Zhujiang dynamic constitutive model was used to fit the test results,and the relevant model parameters were obtained.
NETL
NSTL
万方数据
维普
