Abstract:
Taishan granite residual soil was taken as the research object, the dynamic shear modulus
G and damping ratio
D of granite residual soil under different stress states were studied and predicted by resonance column test.The model prediction analysis was carried out. The research shows that the test points of
G-
γ present typical hyperbolic distribution, and the influence of confining pressure decreases with the
γ increased. The influence of confining pressure on the relationship between
D and
γ is not obvious. The double logarithmic model may reflect the relationship between
Gmax and
γ, the model can be used to predict the parameters of
Gmax. Under the small strain, the curves of the relationship between G and γof the soil under different stress states are close to each other, when the
γ>10
-5, the
G value decreases rapidly under various confining pressures. In the selection of engineering parameters, attention should be paid to the variation of shear modulus with stress state (depth) in small strain range. Martin-Davidenkov model and the empirical relationship between
D and
γ has been used to built the variation law of
G/
Gmax and
D with
γ, and the dynamic shear modulus and damping ratio of small strain range are used as recommended values. This study may provide technical reference for similar projects.