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<p>To address the challenges of controlling surrounding rock during gob-side entry retention under hard roof conditions at nearly 1,000 m depth, this study uses the Ji-15-17-12130 working face of the Pingbao Coal Mine as its engineering background. Using theoretical analysis, numerical sim-ulations, and field tests, the study investigates the effect of roof cutting on the structural and stress conditions of the overlying strata in the gob-side entry. The technical features and process flow of roof-cutting pressure relief with filling in gob-side entry retention are summarized, and appropriate process parameters are determined and implemented on-site. Results show that roof cutting changes the basic roof of the gob-side entry from a “cantilever beam” to a “short canti-lever beam,” which effectively reduces excessive additional stress and the dynamic load impact on the filling wall. When the cutting height equals the basic roof thickness and the cutting angle is 5°–10°, the surrounding rock displacement and stress remain low, and the basic roof collapses into a “short cantilever beam.” After a lag distance of 240 m behind the working face, the entry deformation stabilizes, with roof subsidence of 154 mm, floor heave of 488 mm, concrete wall convergence of 32 mm, lower sidewall convergence of 111 mm, maximum anchor cable stress of 395 KN, and roof separation of 48 mm. The entry shows high formation quality and stable sur-rounding rock control. This technology offers theoretical support for gob-side entry retention un-der similar engineering conditions.</p>

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Mechanism and Application of Roof Cutting Pressure Relief Filling Gob-Side Entry Retention in Deep Hard Roof Working Face

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Yong-jia Xu,
  • Kun-peng Ding,
  • Jian-le Zhang,
  • Wen Wang

摘要

To address the challenges of controlling surrounding rock during gob-side entry retention under hard roof conditions at nearly 1,000 m depth, this study uses the Ji-15-17-12130 working face of the Pingbao Coal Mine as its engineering background. Using theoretical analysis, numerical sim-ulations, and field tests, the study investigates the effect of roof cutting on the structural and stress conditions of the overlying strata in the gob-side entry. The technical features and process flow of roof-cutting pressure relief with filling in gob-side entry retention are summarized, and appropriate process parameters are determined and implemented on-site. Results show that roof cutting changes the basic roof of the gob-side entry from a “cantilever beam” to a “short canti-lever beam,” which effectively reduces excessive additional stress and the dynamic load impact on the filling wall. When the cutting height equals the basic roof thickness and the cutting angle is 5°–10°, the surrounding rock displacement and stress remain low, and the basic roof collapses into a “short cantilever beam.” After a lag distance of 240 m behind the working face, the entry deformation stabilizes, with roof subsidence of 154 mm, floor heave of 488 mm, concrete wall convergence of 32 mm, lower sidewall convergence of 111 mm, maximum anchor cable stress of 395 KN, and roof separation of 48 mm. The entry shows high formation quality and stable sur-rounding rock control. This technology offers theoretical support for gob-side entry retention un-der similar engineering conditions.