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Modern Mining ›› 2024, Vol. 40 ›› Issue (06): 54-.

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Research on Optimization of Key Parameters of Open-pit to Underground Mining Based on Numerical Simulation

Based on the special situation that the surrounding rock of the upper and lower plates of the
ore body needs to be protected when an open-pit iron mine is transferred to underground mining，combined
with the occurrence characteristics of deep ore bodies，the key parameters of underground mining are ana⁃
lyzed by numerical simulation using FLAC3D . It is found that the horizontal width of the pillar reserved be⁃
tween the top of the stope and the boundary of the hanging wall in the upper mining unit of the underground
mining orebody has a great influence on the stability of the stope goaf and the surrounding rock of the hang⁃
ing wall.In order to realize the efficient and safe mining of deep resources，it is recommended that the hori⁃
zontal safety width of the pillar reserved at the top of the stope of the hanging wall mining unit is 10 m，and
the sequence of interval mining between plates is adopted. Filling operation should be carried out as soon as
possible to control the roof settlement of the stope.
  

  1. 1. Baotou Steel Group Mining Research Institute; 2. Sinosteel Maanshan General Institute of Mining Research Co.，Ltd.；3.Jiangxi University of Science and Technology College of Emergency Management and Safety Engineering，
  • Online:2024-06-17 Published:2024-08-06

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Abstract:

Based on the special situation that the surrounding rock of the upper and lower plates of the
ore body needs to be protected when an open-pit iron mine is transferred to underground mining，combined
with the occurrence characteristics of deep ore bodies，the key parameters of underground mining are ana⁃
lyzed by numerical simulation using FLAC3D . It is found that the horizontal width of the pillar reserved be⁃
tween the top of the stope and the boundary of the hanging wall in the upper mining unit of the underground
mining orebody has a great influence on the stability of the stope goaf and the surrounding rock of the hang⁃
ing wall.In order to realize the efficient and safe mining of deep resources，it is recommended that the hori⁃
zontal safety width of the pillar reserved at the top of the stope of the hanging wall mining unit is 10 m，and
the sequence of interval mining between plates is adopted. Filling operation should be carried out as soon as
possible to control the roof settlement of the stope.

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