Choosing and estimating shear resistance parameters of gravel soils

This issue is dealing with new yield criterion for gravel soils development. The most popular criteria for non-cohesive soils are analysed and the parameters they are based on. Proposed yield criterion is based on invariant parameters and concerns friction, cohesion and engagement between particles. It also takes into account second principal stress by using a non-fixed sliding plane. The parameters of this criteria are physically justified and can be determined by standard soil test