Geomechanical Behavior of Rock Mass in the Vicinity of Deep-Set Underground Openings at Potash Deposits

Abstract: The stress–strain research of rock mass is carried out, with verification by observations over underground openings at the Starobin and Petrikov deposits of potassium salt. The qualitative and quantitative indicators of the limit state zones in the vicinity of mine openings at moderate and great depths were compared using an integrated criterion. The formulas are proposed for determining sizes of limit state zones at great depths, with regard to geological structure of the test deposits. The numerical modeling algorithm of formation of rock blocks in the vicinity of underground openings on the basis of introduction of special block elements as systems of elastic and viscoelastic links is discussed. The research findings are applicable in stability assessment of mine openings in planning mining operations, and in selection of mine support and protection methods.