Usaty V. Parameters substantiation of complex-shape rooms of second-order mining of the reserves with backfill

Dissertation is dedicated to a current scientific task solution of parameters substantiation of complex shape rooms of second-order mining of the reserves with the backfill, taking into account stress state of the conglomerate that forms in the roof during backfilling and consists of ore. The basic idea of the work is in the accounting of the stresses distribution laws in the massif around the complex form of the rooms with the backfilling of the worked-out area and selection of rational technological parameters of the rooms of the second-order mining of ore reserves at the Zaporirzian iron-ore plant in complex mining-geological conditions. Concentration coefficient "equivalent stresses" distribution dependences on spatial position of the room's elements, physical-mechanical properties of the massive conglomerate in the roof, succession of the rooms mining at the surface and bottom of the ore deposit are established. Based upon the simulation, methodical approach to the technological parameters of development and face workings are substantiated and realized for the second-order-mining rooms and their configurations taking into account stress state of the surrounding rocks and protective action mechanism of the backfill massif.