Strength Calculations of Block Elements of Room-and-Pillar Mining under the Permafrost Conditions

The paper covers results of rheological properties of gypsum under natural conditions of permafrost and stress-and-strain conditions of room’s roof rocks in gypsum quarries depending upon the ceiling thickness. The recommendations concerning room and pillar parameters are given

Study of rock displacement with the help of equivalent materials using room-and-pillar mining method

Field study made with the help of equivalent materials to determine minimum dimension of interchamber and barrier pillars and limiting chamber span was carried out. Modeling was made for gypsum quarry