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An Investigation of the Interaction of Rock and Types of Rock Bolts for Selected Loading Conditions. Second Annual Report.

Authors
Haas-CJ; Keith-HD; Nitzsche-RN; Et Al
Source
NTIS: PB/267-672 Available for Reference At Bureau Libraries :353 pages
Link
NIOSHTIC No.
10001025
Abstract
The objective of this research was to investigate the interaction phenomena of rock and types of rock bolts to develop design principles for using grouted roof bolts. The investigation was to determine the effectiveness of grouted bolts in resisting lateral displacement and axial separation along fracture planes, and also to determine if grouted bolts eliminate the axial tensile stress near the anchor and resulting rock fracture. The first year objective, which involved defining the post tensioning response of grouted bars and determining the amount of shear resistance generated by conventional and resin-grouted bolts, was achieved. The second year objectives were to make additional shear tests, conduct creep tests, and continue the theoretical analysis of the support mechanism of rock bolts. Finite-element analysis showed that high stress concentrations are created when an expansioned-anchor bolt separates. The stress distribution in a mine roof structure not subjected to lateral loading is not affected significantly when bolts are installed.
Publication Date
19750101
Document Type
CP; Final Contract Report;
Fiscal Year
1975
NTIS Accession No.
PB-267672
NTIS Price
A17
Identifying No.
OFR 3-77
NIOSH Division
SRC;
Source Name
NTIS: PB/267-672 Available for Reference At Bureau Libraries
State
MO;
Performing Organization
University of Missouri
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