The Influence of Time-Varying Stresses in the Rock Mass on the Stress State of Mine Workings

Abstract

The stress state of the concrete walling of mine shafts is formed as a function of the structural parameters of the shaft, the total stress tensor, which includes gravitational-tectonic and time-varying stresses acting in the rock mass at the baseline, taking into account the physical and mechanical properties of the rock mass, the elastic modulus of concrete, which depends on the rate of advance and additional stresses caused by a subsequent change in the stress field, determined outside the zone of influence of mining by a cyclic change in natural stresses, and in the zone of influence of the mined-out space - by a change in the secondary stress field. The paper has presented the results of the research, which significantly increase the degree of geomechanical study of the Gaiskoye deposit’s rock mass. The main purpose of the research was to determine the parameters of the initial stresses acting in the concrete walling of the shafts at different depths. The parameters of stresses acting in the shaft walling at deep mine horizons were determined under field conditions, and the stress-deformed state of the shaft walling at various horizons was monitored throughout the depth of the shaft in the period 2013 - 2020.