Seismicity and stress changes subsequent to destress blasting at the Galena Mine and implications for stress control strategies
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

For very narrow results

When looking for a specific result

Best used for discovery & interchangable words

Recommended to be used in conjunction with other fields

Dates

to

Document Data
Library
People
Clear All
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

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

Filetype[PDF-706.16 KB]


English

Details:

  • Corporate Authors:
  • Description:
    "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." - NIOSHTIC-2

    NIOSH no. 10003155

  • Document Type:
  • Place as Subject:
  • Collection(s):
  • Main Document Checksum:
  • Download URL:
  • File Type:

Supporting Files

  • No Additional Files
More +

You May Also Like

Checkout today's featured content at stacks.cdc.gov