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<p>The composite load-bearing of the roadside backfill body (RBB) and gangue during gob-side entry retaining by roof cutting (CLGERRC) is an innovative coal mining technology. In this study, taking the Zhuzhuang Coal Mine as a case study, the methods of theoretical analysis, numerical simulation, and field testing are used to analyze the stress evolution theory and deformation characteristics of the surrounding rock under two techniques: traditional gob-side entry retaining (TGER) and the CLGERRC technique. The results showed that the new approach effectively reduced the degree of stress concentration of the roadway compared with the TGER technique. The peak vertical stresses in the solid coal side and RBB were reduced by 28.3% and 44.4%, respectively. The peak stresses in the roof were reduced by 54.4%, demonstrating a significant pressure releasing effect. The deformation of the roof-to-floor and the rib-to-rib was considerably reduced. The CLGERRC technique was more beneficial for RBB stability than the TGER under deep coal mines, reducing the number of penetrating cracks and improving the sealing capacity. The field test results show that the CLGERRC technology can effectively control the deformation of the roadway.</p>

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An Innovative Approach to Composite Load-bearing for Gob-side Entry Retaining in Deep Mines by Roof Cutting: a Case Study

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • Meng Ningkang,
  • Yu Rui,
  • Wang Meng,
  • Shen Wenlong,
  • Yang Zhanbiao,
  • Wang Xiangyu,
  • Li Zhaoxin,
  • Chen Ziqiang

摘要

The composite load-bearing of the roadside backfill body (RBB) and gangue during gob-side entry retaining by roof cutting (CLGERRC) is an innovative coal mining technology. In this study, taking the Zhuzhuang Coal Mine as a case study, the methods of theoretical analysis, numerical simulation, and field testing are used to analyze the stress evolution theory and deformation characteristics of the surrounding rock under two techniques: traditional gob-side entry retaining (TGER) and the CLGERRC technique. The results showed that the new approach effectively reduced the degree of stress concentration of the roadway compared with the TGER technique. The peak vertical stresses in the solid coal side and RBB were reduced by 28.3% and 44.4%, respectively. The peak stresses in the roof were reduced by 54.4%, demonstrating a significant pressure releasing effect. The deformation of the roof-to-floor and the rib-to-rib was considerably reduced. The CLGERRC technique was more beneficial for RBB stability than the TGER under deep coal mines, reducing the number of penetrating cracks and improving the sealing capacity. The field test results show that the CLGERRC technology can effectively control the deformation of the roadway.