TAKING INTO ACKOUNT THE MOSAIC STRUCTURE OF STRESS-STRAIN STATE OF ROCK MASS DURING SOLVING THE PRACTICAL TASKS OF MINING

Abstract

The analysis of the contemporary models of the nature of stress-strain state have proved that the key factor in the formation of the stress field is hierarchically block structure of the rock mass. The main factor, that obtain the selection of the structural unit regardless to the hierarchical level, is the ability of smaller structures for responding to external force uniformly. On this basis the method of construction of geo-mechanical model of the system "underground working – enclosing rock mass" have been improved. The task of determining the boundary conditions by the superposition of stresses and strains, which is to be determined by the decision of the elastic problem in a static statement on three spatial and temporal scales. The levels reflect modern geodynamic movement of three hierarchies of structural rock mass elements, namely:
- large lithospheric blocks (cross-sectional dimensions are hundreds and thousands kilometers), determining stress-strained state of the region;
- structural blocks of the ore field (dimensions are about hundreds of meters), defining stress-strained state of the field sites;
- structural rock mass blocks around underground worкings (the dimensions are about several decimeters), determining stress-strained state of the geotechnical system "underground working – enclosing rock mass."
The paper presents a practical example of the method in the researching work of the Institute of Mining of the Ural Branch of the Russian Academy of Sciences on geomechanical maintenance of shaft "Ventilationny" of mine "Decade of Kazakhstan's independence" (Donskoi GOK, Khromtau, Kazakhstan).