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A flexible helical rock bolt.

Authors
Babcock-CO
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 8300R, 1978 Jan; :1-26
Link
NIOSHTIC No.
10007852
Abstract
This report describes the results of Bureau of Mines laboratory and preliminary field tests on a rock bolt of helical shape. The flexible construction allows the bolt to maintain a more stable load level than is possible with a straight bolt. Bolt load changes resulting from anchor slippage, blasting shock, or changes in mine geometry with mining advance are minimized. Preliminary field tests were performed at the Kaiser Steel York Canyon Mine where the load changes of straight and helical bolts were measured using a vibrating-wire load gage. The field tests were performed to establish the viability of the concept of a helical bolt. The practical usefulness in terms of performance and economics remains to be shown. The change in bolt load for the flexible bolts was one- third that for the straight bolts. There were no malfunctions of the gage, and the bolts maintained a more uniform load than the straight bolts used as controls.
Keywords
Mining-industry; Underground-mining; Ground-control; Ground-stability; Mining-equipment; Engineering-controls
Publication Date
19780101
Document Type
IH; Report of Investigations
Fiscal Year
1978
NTIS Accession No.
PB-293725
NTIS Price
A03
Identifying No.
RI-8300R
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 8300R
State
CO
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