PATTERNS OF STRESSED STATE FORMATION IN CONCRETE SUPPORT AND ROCK MASS AT THE GAYSKOYE DEPOSIT

Abstract

The authors have developed and adapted the method of long-term monitoring of the changes in the stressdeformed state of the shaft lining and the rock mass to the local conditions. The new structure of the stress field in the rock mass has been defined; taking into account the parameters of the variables in the stress time with their chronological reference, it is possible to calculate the stress-deformed state of concrete support of the mine shafts subject to natural stresses, considering their time variations. The relevance of the research is determined by the need to monitor and evaluate the effeciency of measures for the rational method for extracting the mineral resources, providing the safety and completeness of its excavation and reduction of irrational losses under otherwise equal conditions. In recent years, it has been established that the natural stresses in the rock mass, which resulted in forming the stresses in the support, change over time, and these changes can lead to an increase in the stresses in the lining,
constituting ≈ 30 ÷ 70% of the normative strength of the concrete. Changes in natural stresses occur at intervals from hours to hundreds of years, and the mechanism of forming the stress in the lining due to these stresses is unknown, although the cases of major destruction in the linings have been identified at dozens of mines during periods when stress variables reach their extreme values.