| Issue |
E3S Web Conf.
Volume 66, 2018
AG 2018 - 4th International Conference on Applied Geophysics
|
|
|---|---|---|
| Article Number | 03003 | |
| Number of page(s) | 10 | |
| Section | Modelling in Geoengineering/Strategic Studies | |
| DOI | https://doi.org/10.1051/e3sconf/20186603003 | |
| Published online | 26 November 2018 | |
The importance of pre-tensioning cable bolts used to reinforce of arch yielding support
1
AGH University of Science and Technology, Cracow, Poland
2
Minova Bohemia s.r.o., Ostrava, Czech Republic
* Corresponding author: zrak@agh.edu.pl
Widespread in Polish hard coal mining, cable bolts are used to reinforce the arch yielding support of roadways. This article attempts to prove that change in approach to long bolting technology can bring significant benefits in terms of improving the stability of roadways, including limiting the development of the fracturing zone in the roof, and ultimately also increasing the frame spacing of arch yielding support. The article contains the results of numerical calculations using the finite element method showing the effect of pre-tensioning on the work of cable bolts installed in a situation when a zone of a fractured rock mass appeared in a roof excavation. As a result of the calculations, the dependence of the final vertical displacements of the roadways roof on different pre-tensioning variants of the cable bolts was presented. The second part of the article presents the practical aspects of the use of cable bolts with pre-tensioning in reinforcing the rock mass and arch yielding support of roadways. In addition, the article identifies the developments in bolting technology which could lead to an increase in work safety and reduce the costs of arch yielding support.
Key words: Reinforcement of support / Arch yielding support / Cable bolts / Pre-tensioning
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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