Dynamic Characteristics of Gravelly Soil Mixed with Different Fine Contents

For the purpose of investigating the influence of fine contents on the dynamic properties of mixed soil, a series of triaxial tests were conducted on the gravelly soil mixed with fine contents. The confining pressures of 100, 150, and 200 kPa were selected. The dynamic triaxial tests were carried out on the samples with 0%, 20%, and 40% fine contents respectively. The axial dynamic strain and pore water pressure curves of the specimens were obtained when different excitation forces were applied. The experimental results indicated that the strength of mixed soils presented an increasing tendency with the increase of confining pressures. Under low confining pressure, the strength increased at first then decreased with the increase of fine contents, while appearing to downtrend under high confining pressure. When the excitation force was large, the axial dynamic strain and pore water pressure increased rapidly.