Rock burst research st the Galena Mine, Wallace, Idaho.
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, TPR 39, 1971 Aug; :1-22
Abstract
A minewide, automatic rock-burst monitoring system has been developed and field tested. Use of this system by mine personnel should allow rock-burst-prone mine structures to be detected, recognized, and evaluated on a routine basis. In related research, a burst-prone stope pillar at the Galena Mine was successfully destressed by blasting a single line of long holes in the footwall of the vein. As a result of destressing, the pillar was fractured and softened; hence it yielded, releasing a large amount of stored elastic strain energy nonviolently. In addition, the high stress in the pillar was shifted out around the stope walls and in the sandfill. Both broad-band microseismic monitoring and seismic velocity surveys were used to evaluate the destressing test. The mechanics of destressing were determined by finite element computer model studies of destressing. Results of the field destressing test agreed remarkably with the predicted results from the computer model.
Keywords
Mining-industry; Underground-mining; Monitors; Monitoring-systems; Rock-bursts; Rock-mechanics
NTIS Accession No.
PB-203983
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, TPR 39
