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<p>Safe excavation of isolated mining faces at great depths is crucial for managing post-mining challenges, yet mining-induced rock bursts remain a significant hazard. This study investigates the evolving stress distribution at the LW25110 longwall face in the Yima coal mine, which is heavily influenced by an adjacent mined-out panel and a nearby thrust fault. The modified double-difference tomography method (TomoDD) demonstrates its effectiveness as a passive approach for stress mapping by inverting velocity variations induced by mining activity. Prior to the first roof weighting activity, the presence of a fault generates two primary fracture clusters and influences their distribution along the maingate and tailgate. Additionally, it creates a high-stress concentration zone in the goaf, which gradually shifts closer to the mining face as extraction progresses. Following the first roof weighting, the abutment stress decreases significantly, reducing the fault's impact and the influence of the adjacent panel. Mining-induced fractures predominantly develop between the two gateroads and extend in the direction of longwall retreat. Before and during the termination of the first roof weighting, these fractures exhibit greater magnitude, a wider and more dispersed distribution, as confirmed by seismic energy, electromagnetic energy, and the standard deviation of extension distance. In contrast, post-weighting fractures are confined to a smaller, more localized region.</p>

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Stress inversion of an isolated longwall face affected by fault and mined-out panels using TomoDD

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月23日

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  • Xin Zhang,
  • Guangyao Si,
  • Gang Wang,
  • Jiawei Qian,
  • Wu Cai,
  • Guozhen Zhao

摘要

Safe excavation of isolated mining faces at great depths is crucial for managing post-mining challenges, yet mining-induced rock bursts remain a significant hazard. This study investigates the evolving stress distribution at the LW25110 longwall face in the Yima coal mine, which is heavily influenced by an adjacent mined-out panel and a nearby thrust fault. The modified double-difference tomography method (TomoDD) demonstrates its effectiveness as a passive approach for stress mapping by inverting velocity variations induced by mining activity. Prior to the first roof weighting activity, the presence of a fault generates two primary fracture clusters and influences their distribution along the maingate and tailgate. Additionally, it creates a high-stress concentration zone in the goaf, which gradually shifts closer to the mining face as extraction progresses. Following the first roof weighting, the abutment stress decreases significantly, reducing the fault's impact and the influence of the adjacent panel. Mining-induced fractures predominantly develop between the two gateroads and extend in the direction of longwall retreat. Before and during the termination of the first roof weighting, these fractures exhibit greater magnitude, a wider and more dispersed distribution, as confirmed by seismic energy, electromagnetic energy, and the standard deviation of extension distance. In contrast, post-weighting fractures are confined to a smaller, more localized region.