Geomechanics and Engineering

  • 제19권2호
  • /
  • Pages.167-178
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  • 2019
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Model test on slope deformation and failure caused by transition from open-pit to underground mining

  • Zhang, Bin (School of Engineering and Technology, China University of Geosciences (Beijing)) ;
  • Wang, Hanxun (School of Engineering and Technology, China University of Geosciences (Beijing)) ;
  • Huang, Jie (Department of Civil and Environmental Engineering, The University of Texas at San Antonio) ;
  • Xu, Nengxiong (School of Engineering and Technology, China University of Geosciences (Beijing))
  • 투고 : 2018.10.04
  • 심사 : 2019.09.30
  • 발행 : 2019.10.10
⟨ 이전 논문 다음 논문 ⟩

초록

Open-pit (OP) and underground (UG) mining are usually used to exploit shallow and deep ore deposits, respectively. When mine deposit starts from shallow subsurface and extends to a great depth, sequential use of OP and UG mining is an efficient and economical way to maintain mining productivity. However, a transition from OP to UG mining could induce significant rock movements that cause the slope instability of the open pit. Based on Yanqianshan Iron Mine, which was in the transition from OP to UG mining, a large-scale two-dimensional (2D) model test was built according to the similar theory. Thereafter, the UG mining was carried out to mimic the process of transition from OP to UG mining to disclose the triggered rock movement as well as to assess the associated slope instability. By jointly using three-dimensional (3D) laser scanning, distributed fiber optics, and digital photogrammetry measurement, the deformations, movements and strains of the rock slope during mining were monitored. The obtained data showed that the transition from OP to UG mining led to significant slope movements and deformations that can trigger catastrophic slope failure. The progressive movement of the slope could be divided into three stages: onset of micro-fracture, propagation of tensile cracks, and the overturning and/or sliding of slopes. The failure mode depended on the orientation of structural joints of the rock mass as well as the formation of tension cracks. This study also proved that these non-contact monitoring technologies were valid methods to acquire the interior strain and external deformation with high precision.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, Central Universities of China

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  2. Hydrochemical analysis and identification of open-pit mine water sources: a case study from the Dagushan iron mine in Northeast China vol.11, pp.1, 2019, https://doi.org/10.1038/s41598-021-02609-0