Strapping of pillars with cables to enhance pillar stability

Show simple item record Alejano, L.R. Arzua, J. Castro-Filgueira, U. Malan, D.F. (Daniel Francois) 2017-09-26T07:18:40Z 2017-09-26T07:18:40Z 2017-06
dc.description.abstract Pillar design for underground mining is typically done using empirical formulae or numerical modelling. Practical experience and recent literature, nevertheless, illustrate the shortcomings of these design approaches. Ongoing monitoring of pillars is therefore recommended to minimize the risk associated with these designs. In a mine where a large number of pillars are cut, different pillar strengths can be expected owing to variations in rock mass strength from area to area. This problem is compounded by the fact that in mining environments the pillars are not always cut according to the prescribed dimensions. Although the original design using either empirical methods or modelling may predict stable pillars, unstable pillars will be encountered in reality. Very conservative designs with large factors of safety may circumvent this problem, but this approach is uneconomical. A possible solution to localized stability problems may be to enhance the strength of a few unstable pillars. It may even be hypothesized that reinforcing a few critical pillars may prevent ‘pillar runs’ on a much larger scale. Rockbolting, strapping of pillars, and pillar shotcreting have occasionally been used in the past as possible solutions. It appears that these have not been successful in all cases and large collapses have occurred in spite of the pillar remedial work. The authors investigated the strapping of pillars by conducting laboratory tests on cabled rock specimens. The results were qualitatively compared to actual attempts of pillar reinforcement available in the literature, as well as additional observations in an old haematite roomand- pillar mine in Spain. Based on these results, the value of steel cabling and mesh wrapped around pillars to improve stability is demonstrated. Some cases where this approach will not be successful are also discussed. en_ZA
dc.description.department Mining Engineering en_ZA
dc.description.librarian am2017 en_ZA
dc.description.sponsorship The Spanish Ministry of the Economy and Competitiveness for partial funding, awarded under Contract Reference No. BIA2014-53368-P, partially financed by ERDF funds from the EU. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Alejano, L.R., Arzua, J., Castro-Filgueira, U. & Malan, F. 2017, 'Strapping of pillars with cables to enhance pillar stability', Journal of the Southern African Institute of Mining and Metallurgy, vol. 117, no. 6, pp. 527-540. en_ZA
dc.identifier.issn 0038-223X (print)
dc.identifier.issn 2225-6253 (online)
dc.identifier.other 10.17159/2411-9717/2017/v117n6a3
dc.language.iso en en_ZA
dc.publisher Southern African Institute of Mining and Metallurgy en_ZA
dc.rights © The Southern African Institute of Mining and Metallurgy, 2017 en_ZA
dc.subject Room and pillar mining en_ZA
dc.subject Pillar stability en_ZA
dc.subject Support en_ZA
dc.subject Strapping en_ZA
dc.subject Cables en_ZA
dc.subject Strength en_ZA
dc.subject Tests en_ZA
dc.subject Granite en_ZA
dc.subject Dilation en_ZA
dc.subject Design en_ZA
dc.subject Mines en_ZA
dc.title Strapping of pillars with cables to enhance pillar stability en_ZA
dc.type Article en_ZA

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