The effect of surface profile, rock strength and pretension load on bending behaviour of fully grouted bolts |
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| Authors: | Hossein Jalalifar Naj Aziz Muhammad Hadi |
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| Institution: | (1) Department of Civil, Mining and Environmental Engineering, University of Wollongong, 2522 Wollongong, NSW, Australia;(2) Shahid Bahonar University of Kerman, Iran |
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| Abstract: | Fully encapsulated rock bolting has, in recent years, become a universally accepted system of ground reinforcement in mining
and tunnel construction. The application of bolting systems extends both to rebar as well as cable bolting. The effectiveness
of the bolt application has been studied in shear, both by laboratory tests as well as by numerical modeling. A specially
constructed double shearing apparatus (DSA) was used to examine the shearing behaviour of a bolt installed perpendicularly
across two joints. The experimental study was complemented with three-dimensional numerical analysis. Parameters examined
include, the effect of reinforced material on tension/compression zones along the sheared bolt, shear resistance, shear displacement
and induced strains and stresses during bolt bending process. The study was undertaken at both free load and pretension conditions.
The conclusions drawn from the study were the level of bolt resistance to shear was influenced by bolt profile configuration,
the strength of the rock or medium influenced the level of load generated on the bolt and the increased bolt pretension contributed
to increased shearing load of the bolted medium. The numerical simulation of the bolt/medium interaction and deformational
behaviour were found to be in close agreement with the experimental test results. |
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| Keywords: | bolt bolt profile double shearing bolt pretension numerical simulation |
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