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Comparative Laboratory Evaluation of Resin-grouted Roof Bolt Elements.

Authors
Bartels-JR; Pappas-DM
Source
MISSING :20 pages
Link
NIOSHTIC No.
10004369
Abstract
In laboratory testing, the Bureau of Mines established criteria by which common resin-grouted roof bolting systems can be evaluated and compared. Ultimate strength and stiffness were determined for nontensioned full-column, point-anchor, tensioned full-column, and debondable resin-grouted bolts, and for variations on full-column bolts. Bolt performances were compared using the performance of the 3/4-in full-column resin-grouted bolt as the standard. New and innovative systems can also be qualitatively compared against this standard. Since the medium into which a resin-grouted bolt is installed is one of the most important parameters affecting bolt performance, various host mediums were used in the testing: sandstone, concrete, simulated coal, simulated shale, and plaster. Bolt performances expected in other mediums can be inferred from the response patterns obtained in these mediums. Results indicate several functional differences among bolt types. Where resistance to shear is important, point-anchor bolts may outperform nontensioned full-column bolts at a lower cost. In medium- to soft- strength rock, tensioned full-column bolts perform best. Also, varying the resin-steel ratio seems to have little effect on the properties of a full-column bolt, when proper resin mixing is ensured.
Publication Date
19850101
Document Type
IH; Report of Investigations
Fiscal Year
1985
NTIS Accession No.
NTIS Price
Identifying No.
RI 8924
NIOSH Division
PRC;
Source Name
MISSING
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