Analysis of the Vertical Movement of Crown Pillar in Cut and Fill Mining Using Finite Element Method

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Authors

  • Hemant Kumar
     Department of Mining Engineering, IIT (ISM) Dhanbad 826 004 ,IN
  • Debasis Deb
     Department of Mining Engineering, IIT, Kharagpur 721 302 ,IN
  • Debashish Chakravarty
     Department of Mining Engineering, IIT, Kharagpur 721 302 ,IN

Keywords:

Geo-Mining Parameters, Crown Pillar, Numerical Modelling, Vertical Displacement, FEM, Orebody Width, Pillar Depth.

Abstract

Crown pillar is a horizontal pillar left to protect the upper level workings when stope advances along the up dip direction and approaches to the upper level in cut and fill method of mining. These horizontal pillars are the main support structures for stopes during excavation. In this study the vertical movement of the pillars at crown level has been analysed by varying the rock mass parameters such as geological strength index (GSI), uniaxial compressive strength (UCS or ċci), modulus of elasticity (E), depth of pillar from surface (D) and thickness of horizontal pillar (T) using finite element method.These analyses have been conducted based on 135 non-linear numerical models considering Drucker-Prager failure criterion in plane strain condition. Results of finite element models are represented in terms of displacements in rock mass of the pillars. Displacement profiles of rock mass along the predefined paths are obtained, presented and analyzed for different models having variation in geo-mining conditions. Finally, the most important parameters affecting the convergence significantly are identified which may be incorporated in the design of the optimum crown pillar thickness.

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Published

2022-10-22

How to Cite

Kumar, H., Deb, D., & Chakravarty, D. (2022). Analysis of the Vertical Movement of Crown Pillar in Cut and Fill Mining Using Finite Element Method. Journal of Mines, Metals and Fuels, 66(8), 465–471. Retrieved from https://informaticsjournals.co.in/index.php/jmmf/article/view/31740

Issue

Volume 66, Issue 8, August 2018

Section

Articles

License

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

References

Kumar, H., Deb, D. and Chakravarty, D. (2016): “Numerical Analysis of Sill and Crown Pillar Stability for Multilevel Cut and Fill Stopes in Different Geomining Conditions.” International Journal of Geotechnical and Geological Engineering, Vol. 34, issue 2, pp 529–549.

Tavakoli, M. (1994): “Underground metal mine crown pillar stability analysis” University of Wollongong, (Research online) Unpublished Thesis collections.

Lu, T. K., Guo, B. H. and Cheng, L. C. (2009): “Review and interpretation of intersection stability in deep underground based on numerical analysis” Taylor & Francis Group, London; ISBN 978-0-415-48475-6.

Edelbro, C. (2003): “Rock Mass Strength – a review.” Technical Report Lulea University of Technology. Department of Civil Engineering Division of Rock Mechanics. ISSN:1402-1536

Gabriel, S. E., Dennis, R. D., John, L. E. and Leonard, J. P. (2011): “Pillar and Roof Span Design Guidelines for Underground Stone Mines.” Department of Health and Human Services (NIOSH) Pittsburgh, Publication No. 2011–171.

Kvapil, R. and Blake, W. (1973): “Geometry and stability determination of large dimension Cut and Fill rooms at Kamoto.” Proceedings of the Jublee Symposium on Mine Filling. pp-147-154.

Moshab (1997): “Geotechnical considerations in underground mines (Guidelines).” Mines Occupational Safety and Health Advisory Board, Department of Industry and Resource, Western Australia; Document No: ZME723QT.

Deb, D. and Das, K. C. (2011): “Enriched finite element procedures for analyzing decoupled bolts installed in rock mass.” International Journal for Numerical and Analytical Methods in Geomechanics. Vol. 35, No. 15, page-1636-1655.

Esterhuizen, G. S. and Iannacchione, A. T. (2011): “Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings.” Department of Health and Human Services (NIOSH) Pittsburgh.

Hoek, E. and Brown, E. T. (1997): “Practical estimates of rock mass strength.” International Journal of Rock Mechanics and Mining Sciences, Vol 34, No 8, pages 1165-1186.

Sinha, R. K., Jawed, M. and Sengupta, S. (2015): “Influence of rock mass rating and in situ stress on stability of roof rock in bord and pillar development panels” International Journal of Mining and Mineral Engineering, Vol. 6, No. 3, pp- 258- 275.