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<p>To tackle stress concentration and resource waste in coal mining, this study proposes an innovative non-pillar retained roadway (NPRR) method. It integrates three core components: negative Poisson’s ratio (NPR) anchor cable support, directional pre-splitting technology (DPT), and an adaptive temporary support system. The approach employs staged stress compensation, synchronized with mining phases. It eliminates protective pillars and optimizes the surrounding rock stress environment. Multi-scale validation included laboratory experiments, numerical simulations, and field trials. Results showed: (1) NPR anchor cables provided continuous radial stress compensation, high pre-stress, and large elongation. (2) DPT reduced stress levels and optimized the stress environment in the surrounding rock. (3) Temporary support controlled dynamic convergence during goaf compaction. Compared to conventional pillar-based methods, this strategy reduced excavation volume by 50%. It also achieved final roadway convergences of 215&#xa0;mm (roof to floor) and 193 mm (rib to rib). This establishes a scientifically grounded framework for sustainable mining. The method enhances safety and resource recovery.</p><p><b>Highlights</b><UnorderedList Mark="Bullet"> <ItemContent> <p>Novel synergy of NPR anchor cables, DPT, and temporary support ensures stability across all mining stages.</p> </ItemContent> <ItemContent> <p>Multi-scale validation confirms significant stress reduction and controlled deformation.</p> </ItemContent> <ItemContent> <p>Framework eliminates protective pillars, enabling sustainable mining via optimized stress environment and structural control.</p> </ItemContent> </UnorderedList></p>

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Experimental and Numerical Study of Stress Compensation and Optimization for Non-pillar Retaining Roadway

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Can Ming,
  • Manchao He,
  • Jiong Wang,
  • Jianning Liu,
  • Jingchen Qi,
  • Massimo Coli

摘要

To tackle stress concentration and resource waste in coal mining, this study proposes an innovative non-pillar retained roadway (NPRR) method. It integrates three core components: negative Poisson’s ratio (NPR) anchor cable support, directional pre-splitting technology (DPT), and an adaptive temporary support system. The approach employs staged stress compensation, synchronized with mining phases. It eliminates protective pillars and optimizes the surrounding rock stress environment. Multi-scale validation included laboratory experiments, numerical simulations, and field trials. Results showed: (1) NPR anchor cables provided continuous radial stress compensation, high pre-stress, and large elongation. (2) DPT reduced stress levels and optimized the stress environment in the surrounding rock. (3) Temporary support controlled dynamic convergence during goaf compaction. Compared to conventional pillar-based methods, this strategy reduced excavation volume by 50%. It also achieved final roadway convergences of 215 mm (roof to floor) and 193 mm (rib to rib). This establishes a scientifically grounded framework for sustainable mining. The method enhances safety and resource recovery.

Highlights

Novel synergy of NPR anchor cables, DPT, and temporary support ensures stability across all mining stages.

Multi-scale validation confirms significant stress reduction and controlled deformation.

Framework eliminates protective pillars, enabling sustainable mining via optimized stress environment and structural control.