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An Investigation of the Effects of Hardened Washers on the Uniformity of Roof Bolt Tension and Resulting Ground Control in an Underground Mine.

Authors
Rosso-RS
Source
NTIS: PB 281 656 Available for Reference At Bureau Libraries :189 pages
Link
NIOSHTIC No.
10001045
Abstract
A program to investigate the effects of hardened washers on the uniformity of roof bolt tension and the resulting ground control in an underground mine was carried out. The complete roof bolt installation and roof bolt loads, mine convergence, and bed separation were monitored for a period of 5 months. The results show no evidence to support or to refute the theory that mechanical roof bolts offer better support when they are installed with a high uniformity of tension. It is also shown that if the bolts are installed with a maximum deviation from the mean torque of +/-15 pct, the addition of hardened washers significantly improved the uniformity of the installed tensions in the roof bolts.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-281656
NTIS Price
A10
Identifying No.
OFR 40-78
NIOSH Division
SRC;
Source Name
NTIS: PB 281 656 Available for Reference At Bureau Libraries
Performing Organization
Terra Tek, Inc.
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