Pretension effect on the performance of cable bolts in underground coal mines

Li, Xu and Si, Guangyao and Oh, Joung and Xiang, Zizhuo and Aziz, Naj and Mirzaghorbanali, Ali (2021) Pretension effect on the performance of cable bolts in underground coal mines. In: 2021 Resource Operators' Conference, 10-12 Feb 2021, Springfield, Australia.


Abstract

Pretension plays a critical role in providing active support to control roof sagging and bedding plane slippage in underground coal mines. However, the optimal amount of pretension for cable bolts to achieve effective ground control remains unknown. Applying excessive pretension on cable bolts may cause cable bolt failure. On the other hand, insufficient pretension is ineffective in preventing large roadway deformation and roof fall incidents. This paper investigates the pretension effect on cable bolts at various geological conditions for underground coal mines. A numerical model based on a coal mine in the Western Coalfield, NSW has been developed by considering the variance of in-situ stress, bedding plane and claystone properties. Model results focused on analysing the pretension effect on the cable bolt force distribution and bond failure along the cable bolts. The overall bond failure along the cable bolts at different geological conditions was also analysed with different pretensions. The neutral point, where relative shear movement between the cable bolt and rock mass is zero, is considered as a key position along the cable bolt to describe its loading behaviour. The results suggest that inappropriate high pretension would promote bond failure. This paper is expected to provide a theoretical guidance for applying optimal pretension in the coal mining industry.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Date Deposited: 08 Jul 2021 01:48
Last Modified: 08 Jul 2021 03:38
Fields of Research (2008): 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
Fields of Research (2020): 40 ENGINEERING > 4019 Resources engineering and extractive metallurgy > 401902 Geomechanics and resources geotechnical engineering
40 ENGINEERING > 4005 Civil engineering > 400502 Civil geotechnical engineering
40 ENGINEERING > 4019 Resources engineering and extractive metallurgy > 401905 Mining engineering
URI: http://eprints.usq.edu.au/id/eprint/42651

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