Abstract:

The consolidation undrained tests of calcareous sand samples from the South China Sea were conducted by using a GDS dynamic triaxial testing apparatus. The results show that the Hardin-Drnevich model can better simulate the G/G_max~ dry density curve of the calcareous sand under complex stress conditions. The dynamic shear modulus value increases with the increase of the confining pressure, and the dynamic shear modulus ratio also increases, but the curve fitting rule of damping ratio is opposite to that of dynamic shear modulus. The maximum dynamic shear modulus value of the calcareous sand increases with the increase of the confining pressure. This relationship demonstrates a linear trend and could be fitted using Janbu Formula.

Key words: Dynamic Triaxial Test, Dynamic Shear Modulus, Damping Ratio, Maximum Dynamic Shear Modulus