Prediction of Secondary Increment Rate of Dynamic Shear Modulus

The idea of“the secondary increment rate of dynamic shear modulus”has been proposed for a long while.However,the influence factors of this rate is still under investigation,Therefore,the “long-term time effect”onthe maximum dynamic shear modulus G_max under the effective overburden pressure was studied in this article, Theregression equations of shear wave velocity were examined as well.The secondary ineronrent of normalized shearmodulus N_g was found increasing as the value of plastic index I_P increased. But,the N_g decreased as the 50% parti-cle size D₅₀ inereased. The N_g of an undisturbed sample is larger that that of a remolded sample in the relationshipof N_g-D₅₀. From the N_g-I_p-C relation,the N_g was becoming larger along with the I_p in the same amount ofclay C. With the same value of secondary compression index C_a,the N_g increased as the I_p increased in the N_g-I_p-C_a relationships.