Method of Suppressing Crumps in Rock Surrounding a Mineral Bed Being Worked in a Mine

摘要

1,181,258. Crump suppression in mines. GLOWNY INSTYTUT GORNICTWA. 15 May, 1967 [16 May, 1966], No. 22356/67. Heading EIF. A method of suppressing crumps in rock surrounding a mineral bed 2 being worked in a mine involves shooting with explosive 9 the zone of maximum stress in the surrounding rock 4 to loosen said rock to relieve stress in the zone, which is in the form of a triangular prism 5 whose vertex lies at the edge of unmined mineral 6 in a bed 7 above or below the bed being worked. Explosive 9 is placed in the upper part of a hole 3 drilled at 25‹ to 30‹ from the heading 1 of the bed 2 being worked.