METHOD FOR CONTROLLING OVER ROOF OF GENTLY SLOPING POTASSIUM STRATA

摘要

FIELD: mining. SUBSTANCE: method includes control over roof of gently sloping strata of potassium includes preparatory works, cleaning and filling with providing unfilled cleaning breast with vaults formed over the latter. Not backfilled breasts are provided at regular intervals to alternate backfilled blocks. Final sagging due to destroying interbreast solids is equal to final sagging due to backfilling vaults with roof rocks. Maximum value equals value with upper part of trapezoid solids formed in stratum roof between vaults reaches beyond limit state at the height due to the roof of stratum being extracted and placed below level of permissible destruction of overlaying rock mass above which its water-proof effect is maintained. Empty cleaning breasts are retained beyond limits of internal boundary of shear trough edge part that would be formed with all breasts backfilled. EFFECT: safety.