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Geotechnical and Geological Engineering

, Volume 37, Issue 5, pp 4461–4472 | Cite as

Ground Pressure Damage Evolution Mechanism of Extraction Level Excavations Induced by Poor Undercutting in Block Caving Method

  • Zhiyuan Xia
  • Zhuoying TanEmail author
  • Qingyan Pei
  • Junhu Wang
Original Paper
  • 174 Downloads

Abstract

Under the condition of bad undercutting, ore pillars are easily left in undercut level in block caving method. In order to reveal the evolution mechanism of ground pressure damage induced by bad undercutting, according to the actual engineering and physical parameters of the mine, a numerical simulation model was established by finite difference software FLAC3D. In the simulation process, the extraction level excavations were excavated first according to the post-undercutting method, and the process of the undercutting were divided into three steps. In the first step, a pillar of 15 m × 5 m was formed. The stress state of extraction level excavations and overlying ore body after each step was monitored and analyzed separately, and it was compared with the actual situation of ground pressure disaster on site. The results show that: Under the influence of high horizontal in situ stress, with the development of undercutting, the special stress state in the extraction level excavations are gradually formed, which is that the compressive stress concentrates on the upper part and the tensile stress concentrates on the lower part. With the development of undercutting, the remaining ore pillar form a certain range of tension stress release area above the undercut level, which makes it difficult for overlying ore and rock to cave in, thus causing the phenomenon of “less ore and no ore” in the draw bells.

Keywords

Block caving Undercutting Extraction level excavations Ground pressure damage High horizontal stress 

Notes

Acknowledgements

This study was sponsored by the National Natural Science Foundation of China (Grant No. 51574015).The authors would like to thank reviewers for their valuable comments and suggestions.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Zhiyuan Xia
    • 1
    • 2
  • Zhuoying Tan
    • 1
    • 2
    Email author
  • Qingyan Pei
    • 3
  • Junhu Wang
    • 4
  1. 1.State Key Laboratory of High-Efficient Mining and Safety of Metal MineMinistry of Education, University of Science and Technology BeijingBeijingChina
  2. 2.School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijingChina
  3. 3.Tongkuangyu MineZhongtiaoshan Non-ferrous Metals Group Co., LtdYunchengChina
  4. 4.Zhongtiaoshan Design InstituteZhongtiaoshan Non-ferrous Metals Group Co., LtdYunchengChina

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