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留设合理宽度的区段煤柱是确保特厚煤层综放工作面顺利接续和安全回采的关键。为确保芦子沟煤矿3107特厚煤层综放工作面仰斜开采过程中,双侧采空煤柱能够稳定承载并有效隔水,分析区段煤柱覆岩结构特征,建立区段煤柱应力计算模型,理论计算了双侧采空煤柱应力,结合数值模拟及理论分析手段对煤柱稳定性进行综合评价。通过实施科学合理的深孔爆破切缝卸压方案,降低了3107工作面采动应力对煤柱的影响,优化了煤柱应力环境,提高了煤柱稳定性,保证了3107工作面的安全回采。研究结果对类似开采条件下的区段煤柱宽度确定及坚硬顶板条件下煤柱卸压具有一定意义。
It is the key to ensure that the fully mechanized top coal caving face of coal mine with smooth width and safe recovery of mining coal pillar with reasonable width. In order to ensure that the fully mechanized top coal caving face in 3107 ultra-thick coal seam of Luzigou coal mine is tilted upward during mining, the double-side mined-coal pillar can be stably carried and effectively water-insulated. The structural characteristics of overburden rock of section pillar are analyzed, The model was calculated, the stress of coal pillar on both sides was calculated theoretically, and the coal pillar stability was evaluated comprehensively by numerical simulation and theoretical analysis. By implementing scientific and reasonable deep-hole blasting slitting and pressure relief scheme, the influence of mining stress on coal pillar is reduced, the stress environment of coal pillar is optimized, the stability of coal pillar is improved, and the safe recovery of 3107 face is ensured . The research results have certain significance for the determination of the width of coal pillar under similar mining conditions and the pressure relief of coal pillar under hard roof conditions.