METHOD OF CONTROL OF ROCK PRESSURE (DEFORMATIONS) IN ROCK MASS ON SOLID MINERAL DEPOSITS Russian patent published in 1997 - IPC

FIELD: mining. SUBSTANCE: the offered method includes making of supporting artificial pillars from high-density filling mixtures in chambers of the first phase in three stages - compaction under gravity, final filling and reinforcing of pillars in contacts with worked rock mass in process of compression. In this case, pillars are made according to load parameters under conditions of bulk compression similar to yielding mine pillars with preset deformations for given conditions. In addition, measured are increment of stress in ore mass adjacent to pillar and level of their maximum stresses. Then, critical period of relaxation is determined by the formula. The first stage of pillar formation is completed in 90-110 days. Beginning of the third stage is combined with completion of final filling, and its ending is combined with sharp rise of pressure in pressure system. Besides, high-density mixture with density of 2100-2300 kg/cu.m is prepared in combination of coarse small and fine classes. EFFECT: higher efficiency. 5 cl, 2 dwg