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

Ghabraie, B. and Ren, G. and Xie, Y. M. and Ghabraie, K. (2012) Study of truss bolt system for highly stressed rock mass using finite element modelling techniques. In: 11th Australia New Zealand Conference on Geomechanics: Ground Engineering in a Changing World, 15-18 July 2012, Melbourne, Australia.

Official URL: http://anz2012.com.au/

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.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Poster)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy. Poster presention
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 04 Feb 2013 02:32
Last Modified: 04 Sep 2017 03:39
Uncontrolled Keywords: truss bolt system, reinforcement, natural roof arch, finite element method
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091402 Geomechanics and Resources Geotechnical Engineering
09 Engineering > 0914 Resources Engineering and Extractive Metallurgy > 091405 Mining Engineering
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/21829

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