Computer analysis of the stress state in the Yenisei Ridge

Abstract

This paper analyzes numerically the mechanical behavior of geological depth structures in the Yenisei Ridge. For creating the computer structures of the researched area, the two geological profiles of “Shpat” and “Batolit-1982” obtained by deep seismic sounding were taken as a basis. To model plastic deformation, the Nikolaevsky elasto-plastic model was used. The depth analysis of the state of stress and strain was realized making use of the inelastic strain increments and the Lode parameter. The maximum values of strain increments are focused in upper layers of Earth’s crust, where pressure is lower, and also in the region of the Yenisei shear belt. The view of the Lode parameter distribution closely depends on the variation of strength properties with depth in the lithosphere. The stress state of the geological profiles “Shpat” and “Batolit-1982” is very heterogeneous, that is caused not only by the difference of physical and mechanical properties of lithosphere layers but the change of the geomedia strength with depth as well.This paper analyzes numerically the mechanical behavior of geological depth structures in the Yenisei Ridge. For creating the computer structures of the researched area, the two geological profiles of “Shpat” and “Batolit-1982” obtained by deep seismic sounding were taken as a basis. To model plastic deformation, the Nikolaevsky elasto-plastic model was used. The depth analysis of the state of stress and strain was realized making use of the inelastic strain increments and the Lode parameter. The maximum values of strain increments are focused in upper layers of Earth’s crust, where pressure is lower, and also in the region of the Yenisei shear belt. The view of the Lode parameter distribution closely depends on the variation of strength properties with depth in the lithosphere. The stress state of the geological profiles “Shpat” and “Batolit-1982” is very heterogeneous, that is caused not only by the difference of physical and mechanical properties of lithosphere layers but the change of the geomedia str...