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Seismicity and stress changes subsequent to destress blasting at the Galena Mine and implications for stress control strategies.

Authors
Boler-FM; Swanson-PL
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9448, 1993 Jan; :1-21
NIOSHTIC No.
10003155
Abstract
The U.S. Bureau of Mines conducts research at the Galena Mine, Wallace, Idaho, with the aim of mitigating the effects of rock bursting. Destress blasting is commonly used as a stress control technique at the mine. A digital seismic array and an array of borehole pressure cells (BPC's) had been installed near the site of a stope undergoing mining and periodic distressing. The instrumentation was being monitored at the time of a distress blast of the 46-99 stope. No significant seismic events occurred coincident with the distress. However, the destress was followed by a 21/2-week period of increased seismic activity, including two damaging events on February 7, 1990, at 034500 (hour, minute, and second) and 122020 Pacific standard time. BPC measurements indicated coseismic ground pressure changes on the order of 200 to 300 kPa associated with the damaging events. Fault plane solutions and dislocation models established that stress changes induced by the event at 034500 may have been significant in promoting the occurrence of the event at 122020. theoretical investigations suggest that applying knowledge of the existing stress field, an understanding of rock burst mechanics, and fracture mechanics principles can improve distress effectiveness.
Keywords
Mining-industry; Rock-bursts; Rock-falls; Safety-research; Safety-measures; Safety-monitoring; Rock-mechanics; Geology; Miners
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-189504
NTIS Price
A03
Identifying No.
RI-9448
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9448
State
CO; ID
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