Acta Scientiarum Polonorum

Cyclic loads frequently are a non-destructive operation. The resulting de-formations
of the cyclic load is different from the static load deformation. The reaction of the soil
to cyclic loading requires a different description because of the possibility to differentiate
the size of plastic deformation and elastic in one load cycle. The reaction of cyclically
loaded cohesive soil is affected by many factors such as the degree of saturation, over-consolidation
ratio or density. Conditions in which the soil is subjected to a load such as the
size of the principal stress (σ3), value of the deviatoric stress (qmax) or stress amplitude (σa)
in the case of repeated loads lead to different reaction cohesive soil. The article presents
results of research on cohesive soil namely sandy – silty caly. The study was conducted
using a cyclic triaxial apparatus. The objective of this study was to characterize the stress
causes a different reaction cohesive soil. The article presents the methodology of research
and analysis of the behavior of the soil. Also it proposed empirical equation for determining
the growth of plastic deformation in subsequent cycles load.