Abstract: In this study is considered the creation of resolving combined differential equations of plane strain plastic deformation in Tresca-Saint-Venant plasticity condition for continuous bodies, the mechanics of which is described by geometrically nonlinear models in the sense of V. Novozhilov which is to say abandoning the consolidation principle. It is shown that the resolving combined differential equations of plane strain plastic deformation in Tresca-Saint-Venant plasticity condition is the system of hyperbolic type and does not permit to obtain H. Hencky integrals.