Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (8): 1181-1186.DOI: 10.12068/j.issn.1005-3026.2018.08.023

• Resources & Civil Engineering • Previous Articles     Next Articles

Multi-method Based Optimization of Crown Pillar Thickness from Open Pit to Underground

XU Shuai1, AN Long1, LI Yuan-hui1, LU Dong2   

  1. 1.Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China; 2. Guilaizhuang Gold Mine, Shandong Gold Group Co. Ltd., Linyi 273300, China.
  • Received:2017-03-15 Revised:2017-03-15 Online:2018-08-15 Published:2018-09-12
  • Contact: AN Long
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Abstract: Taking a project from open pit to underground mining in the Guilaizhuang Gold Mine of Shandong Gold Group Co., Ltd. as an example, multiple methods including theoretical calculation, scaled span approach and analogy under similar conditions are employed to analyse the rational scope of crown pillar thickness. The influence of underground mining on the crown pillar and slope stability is analysed with different thickness crowns using the software FLAC3D. The calculation results show that the 10m thick crown pillar can be viewed as a turning point: when the thickness is less than 10m, the roof deformation caused by underground mining is large, and the thinner the crown pillar, the larger the displacement increment; when the thickness is over 10m, the roof deformation from underground mining is relatively small and tends to remain stable.

Key words: open-pit to underground, crown pillar thickness, theoretical analysis, numerical calculation, scaled span approach

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