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An Experimental Study on the Shear Performance of Fully Encapsulated Cable Bolts in Single Shear Test

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Abstract

A set of single shear tests on fully encapsulated cable bolts was carried out using a newly developed and integrated Megabolt single shear apparatus. The instrument is designed to determine the pure shear strength of cable bolts where there is no contact between the host body faces during the shearing process. Eight different types of cable bolt were encapsulated in 40 MPa concrete cylinders, using Stratabinder HS grout. Prior to encapsulation, cable bolts were pretensioned at the desired value using a manual pretensioner. Effects of surface profile, pretension value and debonding on shear strength of cable bolts were investigated. It was found that the shear strength of spiral/indented cable bolts was lower than that of plain cable bolts. Increasing the pretension load decreased the peak shear load of cable bolts. In general, no debonding was observed for spiral/indented cable bolts during shear testing; however, all tested plain cable bolts were debonded.

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Abbreviations

MKI:

Small-scale double shear test

MKII:

Large-scale double shear test

MKIII:

Modified large-scale double shear test

MISSR:

Megabolt integrated single shear test

LVDT:

Linear variable differential transducer

UCS:

Uniaxial Compressive Strength

UTS:

Uniaxial Tensile Strength

\( \tau \) :

Shear strength of encapsulated cable bolt

\( \tau_{\text{y}} \) :

Shear load at yield point

\( \tau_{\text{p}} \) :

Peak shear load

\( \tau_{\text{r}} \) :

Residual shear load

\( \delta_{1} \) :

Shear displacement at yield point

\( \delta_{2} \) :

Shear displacement at peak shear load

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Acknowledgements

The single shear apparatus used in this study was developed by Megabolt Australia, and was made available to researchers to undertake shear characterisation of various cable bolts used for ground reinforcement in Australian mines. The project was funded by ACARP (Project C24012) with in kind support from various bolt manufacturers and the University of Wollongong. Accordingly, the authors wish to acknowledge the support of Mr Owen Rink of Megabolt in his engagement with the project in training and preparation of samples for testing, thus maintaining consistency in sample preparation for testing. Special thanks to Alan Grant, Colin Devenish, Duncan Best and Travis Marshal, the technical staff of the School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, the University of Wollongong. Various types of cables used in this study were provided by various bolting companies including Megabolt Australia, Jennmar Australia, and Minova/Orica. Orica/Miniva also supplied Stratabinder grout for this study.

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Authors and Affiliations

  1. School of Civil, Mining and Environmental Engineering, University of Wollongong, Northfields Ave, Wollongong, 2500, Australia

    Naj Aziz, Haleh Rasekh, Ali Mirzaghorbanali, Guanyu Yang, Saman Khaleghparast & Jan Nemcik

  2. Centre for Future Materials, School of Civil Engineering and Surveying, University of Southern Queensland, West St, Darling Heights, Toowoomba, 4350, Australia

    Ali Mirzaghorbanali

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  1. Naj Aziz
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  2. Haleh Rasekh
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  3. Ali Mirzaghorbanali
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  5. Saman Khaleghparast
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  6. Jan Nemcik
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Correspondence to Ali Mirzaghorbanali.

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Aziz, N., Rasekh, H., Mirzaghorbanali, A. et al. An Experimental Study on the Shear Performance of Fully Encapsulated Cable Bolts in Single Shear Test. Rock Mech Rock Eng 51, 2207–2221 (2018). https://doi.org/10.1007/s00603-018-1450-0

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