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Significance of Bolt Tension in Ground Control.

Authors
Maleki-H
Source
Paper in Rock Support in Mining and Underground Construction Balkema PP 439-449 :439-449
Link
NIOSHTIC No.
10011303
Abstract
Bolt installation tension is considered to be one of the most important factors contributing to rock reinforcement when mechanically anchored roof bolts are used. To evaluate the influence of uniform tensioning on roof stability, 13,000 mechanically anchored roof bolts were installed in an operating coal mine using both a conventional and a thrust-torque-controlled bolting machine. Geological and mine conditions were monitored when the bolts were installed and for 2 months afterward, and limited monitoring of roof sag, bolt tension, and changes in entry stability continued for another 4 years. Eleven of 24 variables were quantified and statistically analyzed for significance and correlations; the important bolting variables influencing roof sag were coefficient of variation of bolt tension and standard deviation of bolt tension. Long-term monitoring gave inconclusive results regarding bolt tension reinforcement mechanisms at this site. Other studies in highly stressed or weak ground have confirmed the importance of bolt tension in rock reinforcement. These studies are being integrated to develop criteria for primary support selection.
Publication Date
19920101
Document Type
OP;
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
OP 131-92
Source Name
Paper in Rock Support in Mining and Underground Construction. Balkema, PP. 439-449
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