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Rock Preconditioning to Prevent Rock Bursts - Report on a Field Demonstration.

Authors
Karwoski-WJ; McLaughlin-WC; Blake-W
Source
NTIS: PB 80-125933 :47 pages
Link
NIOSHTIC No.
10001067
Abstract
To improve rock-burst control in deep vein mining, a field demonstration has been carried out by the Bureau of Mines to test a new rock-burst control concept--rock preconditioning in advance of mining. The procedure is to fracture the major rock-burst-prone zone during the development of each level before production mining. This allows initial mining to begin in a preconditioned zone and later mining from the level below to end in a prefractured or preconditioned pillar zone that is relatively burst-free. The field data compared favorably with predicted results from a finite-element computer model simulation of the destressing. Based on observations made during mining and on the data from the Hecla rock-burst monitoring system, there is no doubt that this preconditioning in advance of mining demonstration resulted in much-improved rock-burst control during first-floor mining. It was also concluded that preconditioning the vein was more effective than preconditioning the wall rock.
Publication Date
19790101
Document Type
IH; Report of Investigations
Fiscal Year
1979
NTIS Accession No.
PB80-125933
NTIS Price
A04
Identifying No.
RI 8381
NIOSH Division
SRC;
Source Name
NTIS: PB 80-125933
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