Effects of thickness of roof layers on optimum design of truss bolt system using finite element modeling techniques

Article

Ghabraie, Behrooz, Ren, Gang and Ghabraie, Kazem. 2013. "Effects of thickness of roof layers on optimum design of truss bolt system using finite element modeling techniques." Electronic Journal of Geotechnical Engineering. 13 (A), pp. 147-158.
Article Title

Effects of thickness of roof layers on optimum design of truss bolt system using finite element modeling
techniques

Article CategoryArticle
AuthorsGhabraie, Behrooz (Author), Ren, Gang (Author) and Ghabraie, Kazem (Author)
Journal TitleElectronic Journal of Geotechnical Engineering
Journal Citation13 (A), pp. 147-158
Number of Pages12
Year2013
Place of PublicationUnited States
ISSN1089-3032
Abstract

In underground excavations, optimum design of reinforcement systems is largely based on geological features of the surrounding rock such as in-situ stress distribution, rock strength properties, thickness of the layers, etc. In current design of truss bolt systems these parameters are yet to be considered. In this study, effects of changing thickness of roof layers on optimum design of truss bolt have been investigated using three stability indicators, namely reduction in the loosened area above the roof, number of plastic points and horizontal movement on the first bedding plane. Total of 7 different bedding configurations have been generated and 100 different truss bolt designs have been tested on each bedding configuration. Results showed that by changing the thickness of the roof layers, the optimum design of truss bolt changes drastically. In highly laminated formations, it has been demonstrated that a gently inclined bolt angle is more effective, while by increasing the thickness of roof layers, truss bolt systems with a higher bolt angle and longer bolts, i.e. similar to systematic rock bolt systems, responds better.

Keywordstruss bolt, ground reinforcement, FEM, optimum design
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400502. Civil geotechnical engineering
401902. Geomechanics and resources geotechnical 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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