... the study of solvability of boundary-value problems in elasticity and plasticity theory as well as in mechanics of granular materials, [5, 23]. We present one of a number of proofs of this principle, ... theory of granular materials is among the most interesting and intensivelydeveloping fields of mechanics because the area of its application is very wide.It involves problems of mechanics of geomaterials ... Golovanov, Y.V., Shirko, I.V.: Review of current state of the mechanics of fast motions of granular materials. In: Shirko, I.V. (ed.) Mechanics of Granular Media: Theory of Fast Motions,Ser. New in Foreign...