Details:

Personal Author:
Whyatt, J. K. (Jeff K.); Jenkins, F. M. (F. Michael); Larson, Mark K.;
Whyatt, J. K. (Jeff K.); Jenkins, F. M. (F. Michael); Larson, Mark K.; Less -
Corporate Authors:
United States. Bureau of Mines.;
Description:
"The U.S. Bureau of Mines conducted an overcore stress measurement on the 5300 level of the Lucky Friday Mine, Mullan, Idaho, to investigate the stress regime around an experimental stope in a rock-burst-prone mine. The result indicated a stress field with unexpected magnitude and orientation [maximum principal stress equals approx. 135 MPa (19,600 psi) oriented S 80 deg W]. An unusual amount of rock-burst activity was encountered during subsequent excavation. A careful review of the overcore data suggested the overcore strain measurements were valid. Moreover, concentrated rock-burst activity suggested that the measured stress field did exist, but was localized and therefore did not represent the farfield in situ stress field." - NIOSHTIC-2 NIOSHTIC no. 20024016
Subject:
[+]
Rock Mechanics.
Rock Pressure.

Series:
Report of investigations (United States. Bureau of Mines) ; 9560;
Document Type:
Report;
Place as Subject:
Idaho; Lucky Friday Mine, Idaho;
Idaho; Lucky Friday Mine, Idaho; Less -
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:b2b92430483f19f316e579fa94f6d4664a565f7831f292a5c8d45d3dfed356b4
File Type:

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• No Additional Files

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