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<p>Traditional caving mining causes deformation and failure of the overlying strata within underground goafs, while roadway excavation and coal washing processes generate substantial coal-based solid waste. Consequently, the surface subsidence and the deterioration of the ecological environment can be caused in the mining area. To solve the above problems, coal-based solid wastes such as coal gangue were utilised to prepare as cemented backfill materials, and the sequential roadway cemented backfill mining (SRCBM) method was innovatively proposed in this study. Through orthogonal experiments, the mechanical properties of the backfill body under different mass concentrations, gangue backfilled ratio, Talbot gradation coefficients, and maximum gangue particle size were tested, and the optimal ratio of backfill materials was determined. Taking the working face CT501 of the Bailiang Coal Mine as an engineering case, the deformation and damage characteristics of the overlying strata under the caving/backfill mining were analyzed through numerical simulation, and the prediction of surface deformation and field measurement were carried out. This research provides a reference for the control of surface deformation after coal mining under buildings.</p>

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Deformation Control of Overlying Strata and Surface by a Sequential Roadway Cemented Backfill Mining Method Using Coal-Based Solid Wastes

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Shuo Liu,
  • Jiuhong Wang,
  • Meng Li,
  • Yong Chen,
  • Peng Huang,
  • Linlin Xie

摘要

Traditional caving mining causes deformation and failure of the overlying strata within underground goafs, while roadway excavation and coal washing processes generate substantial coal-based solid waste. Consequently, the surface subsidence and the deterioration of the ecological environment can be caused in the mining area. To solve the above problems, coal-based solid wastes such as coal gangue were utilised to prepare as cemented backfill materials, and the sequential roadway cemented backfill mining (SRCBM) method was innovatively proposed in this study. Through orthogonal experiments, the mechanical properties of the backfill body under different mass concentrations, gangue backfilled ratio, Talbot gradation coefficients, and maximum gangue particle size were tested, and the optimal ratio of backfill materials was determined. Taking the working face CT501 of the Bailiang Coal Mine as an engineering case, the deformation and damage characteristics of the overlying strata under the caving/backfill mining were analyzed through numerical simulation, and the prediction of surface deformation and field measurement were carried out. This research provides a reference for the control of surface deformation after coal mining under buildings.