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In situ stress at the Lucky Friday Mine (in four parts). 2. Analysis of overcore measurement from 5300 level.

Authors
Whyatt-JK; Hansen-JS
Source
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9560, 1995 Jan; :1-42
NIOSHTIC No.
20024016
Abstract
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.
Keywords
Mining-industry; Underground-mining; Rock-bursts; Rock-falls; Rock-mechanics; Geology
Publication Date
19950101
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
PB95-251880
NTIS Price
E05
Identifying No.
RI-9560
ISSN
1066-5552
NIOSH Division
SRC
Source Name
Spolane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9560
State
ID; WA
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