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Transfer mechanics of full-column resin-grouted roof bolts.

Authors
Tadolini-SC; Dyni-RC
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9336, 1991 Jan; :1-14
Link
NIOSHTIC No.
10008484
Abstract
The U.S. Bureau of Mines conducted a laboratory investigation designed to evaluate the stress and deformation characteristics of fully grouted roof bolts subjected to various magnitudes of end loadings. The experiment and subsequent analysis were completed, utilizing axial deformation data obtained ultrasonically from forty- one 4-ft, grade 40 roof bolts, with a total of 132 measurement locations along the lengths of the bolts. The ultrasonic measurement instrumentation used in this investigation allowed for elongation measurements without requiring extensive bolt modifications. The results indicate that approximately 39 pct of the applied end load dissipated within the first 3.4 In of the bolts. However, only 3 pct of the applied load was realized beyond 28 in of the grout column. Data are presented individually for every 6-in increment of bolt length; analysis was performed using statistical, nonlinear equations developed for 5,000- and 8,000-lb loading conditions.
Keywords
Measuring-instruments; Loads-Forces; Mining-engineering; Stress-analysis; Experimental-data; Nonlinear-systems; Mathematical-models; Ultrasonic-tests; Deformation; Underground-supporting; Columns-supports; Grouting; Bolts
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
PB91-200501
NTIS Price
A03
Identifying No.
RI-9336
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9336
State
PA
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