Details:

Personal Author:
Serbousek, M. O. (Maynard O.) ; Signer, S. P. (Stephen P.)
Serbousek, M. O. (Maynard O.) ; Signer, S. P. (Stephen P.) Less -
Corporate Authors:
United States. Bureau of Mines.
Description:
"The load-transfer mechanics of fully grouted roof bolts in coal mines have been investigated in laboratory and analytical studies. The purpose of this Bureau of Mines research is to increase understanding and better interpret data from routine field pull tests and to develop a numerical model of a grouted bolt that can be used in a global computer model of a mine roof. Analytical studies using closed-form solutions and finite-element techniques were compared to experimental results. Laboratory work includes variation of bolt length, hole diameter, and grout type. Pull tests were performed on 4-, 2-, and 1-ft bolts in holes of 1- and 1-3/8 in diam. Both polyester resin and inorganic grouts were used as the anchorage medium. Strain gauges were installed on the bolts at several locations to observe the rate of load transfer from the bolt through the grout to the rock mass when a force was applied at the bolt end using standard jack pull testing procedures and equipment. The average anchorage length of 4- and 2-ft bolts was 22 in. Grout type and hole size variations did not produce a significant effect on the rate of load transfer from the bolt to the rock." - NIOSHTIC-2

NIOSHTIC no. 10005974


Subject:
[+]
Grouting.
Mine Roof Bolting.

Series:
Report of investigations (United States. Bureau of Mines) ; 9135
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:c166af9245119416b236953859c13dbd34d4402ba9c3f8cd1e6583bdc9b99aee
File Type:

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