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Ground pressure control practice in deep mining in the Sanxin Gold-Copper Mine

  • English Author:
  • Yao Yifei¹, Li Minzhi¹, Li Junping², Tian Bo¹

  • Unit:
  • (1. Hubei Sanxin Gold Copper Limited Company; 2. School of Resources Engineering, Xi’an University of Architecture and Technology)
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Abstract:

As mining in the Sanxin Gold-Copper Mine extends to deeper levels, the engineering geological condi-tions and orebody occurrence have worsened, with increasing in-situ stress and intensified ground pressure manifesta-tions. This study utilized field investigation data on ground pressure phenomena, in-situ stress measurements, and labo-ratory-derived physical and mechanical rock parameters. Using Flac"software for numerical simulation, the overall distribution pattern of ground  pressure was analyzed.  The  study determined the reasonable safety distance  from  the orebody boundaly to along-the-vein drifts in the hanging wall and footwall. It also optimized stope structural parameters and surrounding rock support methods  during extraction to control issues such as roof caving and collapses, therebypreventing excessive ore dilution and rock  mass displacement in both walls. A threshold for non-contact between the backfill and roof was proposed to avoid overall movement of the stope roof or backfill, which could result in surface cracking or subsidence. The research provides several conclusive recommendations for ground pressure control in deep mining, offering technical support and theoretical basis for the safe and efficient extraction of deep orebodies in the Sanxin Gold-Copper Mine.

Keywords:

deep mining; ground pressure control; stope structural parameter; ground pressure investigation; numerical simulation; ground pressure distribution regularity; control method