Study of truss bolt system for highly stressed rock mass using finite element modelling techniques

Poster

Ghabraie, B., Ren, G., Xie, Y. M. and Ghabraie, K.. 2012. "Study of truss bolt system for highly stressed rock mass using finite element modelling techniques." Narsilio, G., Arulrajah, A. and Kodikara, J. (ed.) 11th Australia New Zealand Conference on Geomechanics: Ground Engineering in a Changing World. Melbourne, Australia 15 - 18 Jul 2012 Australia .
Paper/Presentation Title

Study of truss bolt system for highly stressed rock mass using finite element modelling techniques

Presentation TypePoster
AuthorsGhabraie, B. (Author), Ren, G. (Author), Xie, Y. M. (Author) and Ghabraie, K. (Author)
EditorsNarsilio, G., Arulrajah, A. and Kodikara, J.
Journal or Proceedings TitleProceedings of the 11th Australia New Zealand Conference on Geomechanics
Number of Pages6
Year2012
Place of PublicationAustralia
ISBN9780646543017
Web Address (URL) of Paperhttp://anz2012.com.au/
Conference/Event11th Australia New Zealand Conference on Geomechanics: Ground Engineering in a Changing World
Event Details
Rank
B
Event Details
11th Australia New Zealand Conference on Geomechanics: Ground Engineering in a Changing World
Event Date
15 to end of 18 Jul 2012
Event Location
Melbourne, Australia
Abstract

Instability of underground excavations causes many problems, it affects safe working environment, reduces recovery of minerals and increases costs of mining operations. Following excavation in rock, a new stress distribution will be produced around the opening. It is known that after a distance from opening boundary, a stable rock arch will be formed regardless of the shape of the opening. Beneath this arch there is a plastic, fractured loosened area that required to be stabilised. Conventional systematic rock bolting is a common practice. However, experience has shown that in the case of severe instability, this type of reinforcement is not satisfactory in controlling roof rock deformations. In these circumstances using truss bolts would be a better alternative. This paper investigates the mechanism of truss bolts and their interaction with surrounding rock mass using numerical modelling techniques. A case study involving a truss bolting reinforced rectangular tunnel in fractured rock mass is discussed in comparison with a conventional systematic rock bolting. Design parameters of truss bolt system are considered with respect to the shape and dimension of the loosened area and design recommendations are presented. Results showed that truss bolt reduces the roof deflection and reinforces the loosened area by moving the natural roof arch towards the opening.

Keywordstruss bolt system, reinforcement, natural roof arch, finite element method
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400502. Civil geotechnical engineering
401902. Geomechanics and resources geotechnical engineering
401905. Mining engineering
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Institution of OriginUniversity of Southern Queensland
Byline AffiliationsRoyal Melbourne Institute of Technology (RMIT)
Department of Agricultural, Civil and Environmental Engineering
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