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Laboratory and in situ mechanical behavior studies of fractured oil shale pillars.

Authors
Brady-BT; Hooker-VE; Agapito-JFT
Source
Rock Mech Rock Eng 1975 Jun; 7(2):101-120
NIOSHTIC No.
10009624
Abstract
Laboratory and in situ behavior of fractured oil shale pillars were correlated, and the information was used to develop design criteria for underground room-and-pillar mining of oil shale. In the colony oil shale mine, in situ stress measurements have been made in pillars of oil shale containing joints of which the planes of weakness are oriented at low angles (<45 deg) to the pillar axis. Four findings of interest have resulted from these measurements: (1) some pillars are in the post-failure condition; (2) pillar failure begins when the maximum and minimum stresses within the pillar become approximately 5,000 psi and 800 psi, respectively; (3) the stresses carried by the "solid" portion of a pillar become constant when the fractured pillar is in a post-failure condition; (4) severely fractured pillars in a post-failure condition can be stabilized by rock bolting normal to the major joint pattern in the pillar.
CODEN
RMREDX
Publication Date
19750601
Document Type
OP; Journal Article
Fiscal Year
1975
NTIS Accession No.
NTIS Price
Identifying No.
OP 100-75
Issue of Publication
2
ISSN
0723-2632
NIOSH Division
DRC
Source Name
Rock Mechanics and Rock Engineering
State
CO
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