Comparing the trend of V_s at similar range of saturated and unsaturated stress state variables

The effect of matric suction on S-wave velocity (V s ) unsaturated soils has been observed to show different trends from the Vs relationship with effective confining pressure. In some soils, increase in per unit stress change (u a -u w is greater than pressure (σ’3) for saturated and dry vice versa other soils. this study, difference was examined through state variables similar soil samples. Experiments were conducted sand kaolin specimens using triaxial cell modified include bender elements high-air-entry disk testing first fully V at various pressures measured. tests repeated subjected net range as previous tests. Data also collated literature. Comparisons made by plotting two-dimensional three-dimensional plots understand differences. It found that type fabric play important role Soil plays more compacted where affected compaction water content.