Influence of configuration chambers on the formation of stress in multi-modulus mass

Purpose.Detecting unstable areas in the filling mass taking into account configuration of the adjacent mineable chambers to improve its formation. Methods. The research into stress state of multi-modulus mass consisting of ore, rocks and filling was conducted using Solid-Works 2011 software with the full compliance of their physical and mechanical properties. Findings. Computer simulation allowed to reveal unstable areas in the filling mass of the first stage chamber under the influence of the development of the second stage chamber. It was found that the vertical stress component forms an area of compressive stresses in the filling mass of the first stage chamber at the junction of its exposure to the roof of filling chamber with dimensions: depth of the mass ? up to 50 m, vertical outcrop ? 9.8 m, the maximum value of stress reaching 89 MPa. The horizontal stress component also forms an area of tensile stress, but with a lower value of 65 MPa. The horizontal stress component generates in the filling mass of the first stage chambers the area of tensile stresses on the substage level 775 ? 810 m with dimensions: depth of the mass ? up to 7 m, vertical exposure ? 10 m, and the maximum stress value ? up to 4 MPa. Originality. Analytical assessment of the filling mass stability allowed to conclude that: at the junction of its exposure to the roof of filling chamber, the compressive stress exceeds the strength of filling mass 1.8 times, in the center of filling mass on the outcrop, the tensile stress exceeds the strength of filling 1.3 times. Vertical stresses exceed horizontal stresses 1.35 times in the areas of filling destruction. Practical implications. The obtained findings related to the stress state of the filling mass can be used in issuing passports for stopes in choosing the filling mode and composition of the filling mixture.