Scholarlink

<p>The dynamic loading induced by overlying strata fracture during longwall mining frequently disturbs the surrounding rock of entries under dynamic pressure, significantly increasing their susceptibility to deformation, fracture, and instability. Regarding the issue where surrounding rock deformation still exceeds the designed allowable limits after implementing the roof-cutting pressure relief technology in the longwall mining process of Fu-yan Coal Mine’s 3208 working face. This study integrates theoretical analysis, in situ monitoring, and numerical simulation to establish four key stability evaluation indicators: abutment stress, fracture quantity, dynamic deformation, and load exerted on support structures. Building upon these four stability evaluation indicators, a stability classification standard for longwall gob-side entries was established. The five evaluation criteria are determined as Superior Complete Pressure Reduction (SCPR), Good Adequate Pressure Reduction (GAPR), Medium Partial Pressure Reduction (MPPR), Ineffective Weak Pressure Reduction (IWPR), Useless Harmful Pressure Reduction (UHPR). Based on this framework, an analytical assessment method for determining the pressure relief level in longwall gob-side entries was proposed. The underlying mechanisms linking the evaluation indicators were identified. The spatiotemporal evolution patterns of these stability indicators in the gob-side coal entry were measured through in situ monitoring at Fu-yan Coal Mine. Moreover, the influence mechanisms of both support strength and immediate roof strength on the stability evaluation indicators were revealed. These research outcomes were applied to the stability control engineering of the gob-side entry at Panel 3208 of Fu-yan Coal Mine. A graded evaluation of the implementation effectiveness of the in situ pressure relief scheme was conducted, leading to subsequent optimization and refinement of the scheme. This study establishes a comprehensive and practical stability classification system for longwall gob-side entries.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Pressure Reduction Effectiveness Evaluation of Entry Under Longwall Mining Disturbance: A Case Study

  • 期刊论文

  • 发表日期：

    2025年10月28日

查看全文
  • Wenlong Shen,
  • Wangsheng Ren,
  • Ziqiang Chen,
  • Meng Wang,
  • Jianbiao Bai,
  • Ningkang Meng,
  • Zhengyuan Qin,
  • Juntao Liu,
  • Tianfu Yao,
  • Yan Gai

摘要

The dynamic loading induced by overlying strata fracture during longwall mining frequently disturbs the surrounding rock of entries under dynamic pressure, significantly increasing their susceptibility to deformation, fracture, and instability. Regarding the issue where surrounding rock deformation still exceeds the designed allowable limits after implementing the roof-cutting pressure relief technology in the longwall mining process of Fu-yan Coal Mine’s 3208 working face. This study integrates theoretical analysis, in situ monitoring, and numerical simulation to establish four key stability evaluation indicators: abutment stress, fracture quantity, dynamic deformation, and load exerted on support structures. Building upon these four stability evaluation indicators, a stability classification standard for longwall gob-side entries was established. The five evaluation criteria are determined as Superior Complete Pressure Reduction (SCPR), Good Adequate Pressure Reduction (GAPR), Medium Partial Pressure Reduction (MPPR), Ineffective Weak Pressure Reduction (IWPR), Useless Harmful Pressure Reduction (UHPR). Based on this framework, an analytical assessment method for determining the pressure relief level in longwall gob-side entries was proposed. The underlying mechanisms linking the evaluation indicators were identified. The spatiotemporal evolution patterns of these stability indicators in the gob-side coal entry were measured through in situ monitoring at Fu-yan Coal Mine. Moreover, the influence mechanisms of both support strength and immediate roof strength on the stability evaluation indicators were revealed. These research outcomes were applied to the stability control engineering of the gob-side entry at Panel 3208 of Fu-yan Coal Mine. A graded evaluation of the implementation effectiveness of the in situ pressure relief scheme was conducted, leading to subsequent optimization and refinement of the scheme. This study establishes a comprehensive and practical stability classification system for longwall gob-side entries.