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Application of tomographic methods for study of structural failure.

Authors
Maleki-H
Source
Proceedings: Mechanics and Mitigation of Violent Failure in Coal and Hard-Rock Mines. Washington, DC: U.S. Bureau of Mines, 1995 May; :313-322
NIOSHTIC No.
20024627
Abstract
U.S. Bureau of Mines researchers investigated the principles, limitations, and application of tomographic measurements for monitoring the history of strata fracturing and failure. These measurements were complemented by static measurements, core testing, fracture mapping, and underground observations to relate measured changes in velocity patterns to the formation of fracture zones, changes in stress, structural stability, and secondary support requirements. These measurements provided new insight into the mechanism of time-dependent failure and excavation-induced rock damage. It was shown that rock damage occurred at the development stage and was influenced by floor and pillar behavior. Tomographic methods clearly identified the development of damaged zones in the mine roof even though there was no visual indication of fracturing at the excavation surface. Fractures initially formed on one side of the roof but later propagated to the other sides, forming a block. In addition, significant changes in velocity in the pillar were measured and related to load transfer from mined-out areas to the pillar.
Keywords
Mining-industry; Rock-falls; Rock-bursts; Rock-mechanics; Underground-mining; Control-technology; Geology; Geophysics; Engineering-controls; Ground-control; Ground-stability; Computer-software
Publication Date
19950501
Document Type
Book or book chapter
Editors
Maleki-H; Wopat-PF; Repsher-RC; Tuchman-RJ
Fiscal Year
1995
NTIS Accession No.
NTIS Price
NIOSH Division
SRC
Source Name
Proceedings: Mechanics and Mitigation of Violent Failure in Coal and Hard-Rock Mines
State
WA
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