ACARP PROJECT C27040 - Development of a Numerical Modelling Approach to Better Understand the Effect of Cable Bolt Performance on Roof Failure Mechanisms in Varying Rock Mass Conditions
Project report
Title | ACARP PROJECT C27040 - Development of a Numerical Modelling Approach to Better Understand the Effect of Cable Bolt Performance on Roof Failure Mechanisms in Varying Rock Mass Conditions |
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Report Type | Project report |
Research Report Category | Not for profit |
Authors | Mirzaghorbanali, A., Rastegarmanesh, A., Aziz, N., Anzanpour, S., Khaleghparast, S., Si, G., Oh, J., Hagan, P. and Li, X. |
Institution of Origin | UNSQ, UniSQ, UoW |
Year | 2021 |
Place of Publication | ACARP - https://acarp.com.au/abstracts.aspx?repId=C27040 |
Web Address (URL) | https://acarp.com.au/abstracts.aspx?repId=C27040 |
Abstract | This project provides an improved numerical modelling approach to enhance mine safety, increase productivity and reduce costs via fit-for-purpose designs and more effective applications of cable bolts in different geotechnical environments. The project objective was to better understand the roof failure mechanisms using a newly developed numerical modelling tool. The questions addressed included whether pretension can reduce the full capacity of a cable bolt, in which types of ground conditions pretension should or should not be used, how much pretension is appropriate if required, how the installation angle will affect cable pretensions and the influence that ground and stress conditions can have on the performance of support systems and resultant roof behaviour. Three universities each undertook a portion of the work within this project: University of Wollongong conducted a laboratory study to identify significant variation in cable bolt performance in rock of differing strength under standardised testing as well as double shear testing at different angles of orientation (inclination). The performance of cable bolts was studied in field-scale models based on the setup of one mine which has challenging geotechnical conditions and has experienced roof instabilities. These models used advanced simulation techniques that were not fully implemented before by previous projects, such as ground relaxation, different boundary conditions, and application of the neutral point in modelling. The research results are expected to provide guidance on the selection of cable bolt pretension and installation angle in various roof strata and in-situ stress conditions, which can ultimately improve ground support performance in the underground coal mining industry. While the published outcome contains the three separate reports (one from each university) these are summarised in an executive summary report that describes: Laboratory-scale cable bolt testing; |
Keywords | Cable bolting, pretension effects, advanced numerical simulations, shear load transfer mechanisms |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 401902. Geomechanics and resources geotechnical engineering |
Byline Affiliations | Centre for Future Materials |
School of Engineering | |
University of Southern Queensland | |
University of Wollongong | |
University of New South Wales |
https://research.usq.edu.au/item/zx477/acarp-project-c27040-development-of-a-numerical-modelling-approach-to-better-understand-the-effect-of-cable-bolt-performance-on-roof-failure-mechanisms-in-varying-rock-mass-conditions
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