PECULIARITIES OF DESINING GEOMECHANICAL MODELS OF LARGESCALE NATURAL AND GEOTECHNICAL OBJECTS BASED ON DIRECT AND INDIRECT DATA ON STRESS FIELDS

Substantiation of technologies for opening and developing solid mineral deposits, seismic zoning of territories for the purposes of large-scale construction is carried out using geomechanical models, so their validation is an urgent task. The article discusses some aspects related to the choice of the size and orientation of the computational domain, as well as the quantitative assessment of the stress field components outside the zone of influence of the target object. Based on a comparative analysis of the linear dimensions of tectonic blocks of the first and second scale levels of the Altai-Sayan folded region, the hierarchy coefficient according to M. A. Sadovsky k = 3.17–3.22 was found, which is proposed to be used in designing nested geomechanical models for the region of the main iron ore deposits of Gornaya Shoria. A method for quantitative assessing the parameters of the external stress field has been developed and tested on real geotechnical objects of various scales (Solikamsk mine and coal seam in the extraction section of the Vorkutinskaya mine). The method is based on solving inverse boundary value problems using direct (measuring hydraulic fracturing) and indirect (passive seismic tomography using the coordinates of the hypocenters of dynamic events and the times of the first arrivals recorded by mine seismic stations) data. The implementation of this method made it possible to determine the principal horizontal stresses in the external stress field of the Solikamsk mine of 14 and 24 MPa, indicating an overthrust geodynamic regime in the vicinity of this geotechnical object.