Geodynamic simulation of ore-bearing geological structural units by the example of the Strel’tsovka uranium ore field

Displacement‐based and hybrid formulations of zero‐thickness mortar/interface elements for unmatched meshes, with application to fracture mechanics

“…Comparing the stiffness matrix of the classical displacement-based formulation of the standard zero-thickness interface element (12,13) with the corresponding expressions for the hybrid formulation described above (59, 60), the structure is similar, with four quadrants consisting of a submatrix repeated four times with alternate signs. This submatrix, k MP in the displacement-based formulation andk el in the hybrid formulation, represent the intrinsic stiffness of the interface element in terms of relative displacements and pairs of forces on the interface midplane or mortar surface.…”

“…10 The condition of matched meshes across the discontinuities may also be too restrictive in the case of meshes initially matched, that may become unmatched due to large opening/sliding of the discontinuities, such as for instance may happen in the analysis of landslides or simulation of geotectonics processes. 11,12 And probably, the most paradigmatic case of unmatched meshes is the general contact/friction problem between two bodies, which have been discretized with independent meshes, and it is not known a priori what part of the surfaces from each body will get in contact with the other. Focusing on the case that the meshes on the continuum on both sides of the discontinuity (or bodies in contact) are preestablished independently, and that the geometry of the contact surface has been determined, one successful approach to formulate such contact is that of mortar elements.…”

Assessment of Seismogeodynamic Activity of Mining Areas on the Basis of 3D Geoinformation Modeling

“…Further, on this basis 3D models of geological and tectonic structure and region's geodynamic is formed; and then 3D fault network models and rock masses of different formational affiliation and properties are being established (Figure 4) On the basis of 3D geotectonic structural models and with the help of finite element method specialized programs the tectonophysical modeling of modern stress and strain fields was carried out. Methodology and results of tectonophysical model-ing, results of which are integrated into 3D GIS built on ArcGIS 10 platform with a model ArcGIS 3D -Analyst, are described in [Petrov et al, 2017b] and there is no need to repeat them. In this context it should be noted, that estimated 2D and 3D models of SS state of rock massifs are verified at two scale levels: regional on the example of the Klichkinskaya seismic dislocation which is active from the middle of the Pliocene up to present days (Figure 5) and local scale on the example of the Antei uranium deposit in Streltsovskoye ore field [Petrov et al, 2015].…”

“…Taking into account the specific nature of geological tectonic structure of different territories, a network structure for seismic geodynamic processes monitoring on many functional test sites should be developed [Bortnikov et al, 2012;Petrov et al, 2014Petrov et al, , 2017b. The observations carried out at the test sites form the information basis for predicting the lithosphere state, taking decisions on the subsoil rational management and ensuring the ecological security of the territories.…”