Stability of vertical mountain developments in elastic-viscous-plastic files with porous structure

The mathematical model of the basic intense-deformed condition of the vertical mountain development, considering elastic-viscous-plastic properties of a file, and also porous structure of a material is constructed. Within the limits of the exact three-dimensional stability equations stability of the basic condition of vertical development in files of rocks with the compressed time is investigated. The estimation of influence on size of critical pressure of parametres of hills is given.