The application of cable bolts for ground support is on the increase in underground coal mines worldwide. Currently, two methods of evaluating the performance of the cable bolt are favoured; the short encapsulation pull test and shear test. The former method can be used both in the laboratory and the field, while the latter can be undertaken mainly in the laboratory. There are two methods of shear strength testing, single and double shear tests. This paper examines the double shear testing of several cable bolts currently marketed in Australia under various pre-tension stresses. Both plain and indented wire cable bolts were tested. It was found that, the shear strength of the cable bolt was a function of the wire geometry and initial pre-tension. Indented wire cable bolts were lower in shear strength than the plain wire cable bolts. A mathematical model was proposed to evaluate the shear strength of cable bolts using Fourier series and Mohr-Coulomb failure criterion. The model coefficients were determined based on the experimental results. The findings from the mathematical modelling tallied well with the experimental results.
[1]
J. M. Goris,et al.
Shear behaviour of cable bolt supports in horizontal bedded deposits
,
1996
.
[2]
Najdat I Aziz,et al.
Shear testing of 28 mm hollow strand "TG" cable bolt
,
2010
.
[3]
Jan Nemcik,et al.
Shear strength properties of Hilti Plain and Indented Strand cable bolts
,
2014
.
[4]
W. Bawden,et al.
THE EFFECT OF ROCK MASS CONFINEMENT ON THE BOND STRENGTH OF FULLY GROUTED CABLE BOLTS
,
1992
.
[5]
W. F. Bawden,et al.
Load distribution along fully grouted bolts, with emphasis on cable bolt reinforcement
,
1996
.