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Time Effects on Resin-grouted Bolt Anchorage Characteristics.

Authors
Wuest-WJ; Stateham-RM
Source
MISSING :11 pages
Link
NIOSHTIC No.
10010991
Abstract
The technical analysis of parameters that can influence roof and rib reinforcement is important to the operation of safe and profitable underground mines. One such parameter, studies in this U.S. Bureau of Mines investigation, is the effect of time on untensioned, resin- grouted bolt anchorage characteristics. Seventy-three 4-ft-long bolts with three different grout column lengths were installed in a stable coal mine roof. The bolts were then subjected to standardized pull tests at various intervals throughout a 37-month period. For each test, load-deformation data were reduced to determine axial stiffness and yield point. The magnitudes of these two anchorage characteristics at the time of installation were compared with results from subsequent pull tests to determine if anchorage capacity deteriorated. Bolts with 18-in grout columns were studied over 9 months, and no measurable loss occurred. Bolts with 48- and 24-in grout columns were studied over 37 months and also exhibited no measurable loss.
Publication Date
19910101
Document Type
IH; Report of Investigations;
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
RI 9388
NIOSH Division
DRC;
Source Name
MISSING
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