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针对特厚煤层综放开采沿空掘巷留设窄煤柱引起的围岩大变形及煤柱失稳问题，以同忻矿8311综放工作面5311回风巷作为研究对象，采用理论分析、数值模拟与工程实践相结合的方法，系统研究了窄煤柱沿空掘巷围岩破坏机制、变形主控因素及控制技术。基于稳定性分析结果优化了巷道支护设计，并提出针对性支护参数。研究结果表明：巷道围岩变形主要集中于顶板与煤柱帮部区域，其破坏形式表现为楔形岩体从顶板剥落脱离或煤壁滑移片帮；通过锚杆-锚索联合支护可有效防止围岩变形传播，抑制巷道失稳，显著改善围岩整体稳定性。研究结果可为类似地质条件下窄煤柱沿空巷道的支护优化设计提供理论依据与工程参考。
Abstract：In response to the problems including large surrounding rock deformation and coal pillar instability caused by narrow coal pillar retention in gob-side entry driving in fully mechanized top coal caving mining of extra-thick coal seams, a systematical investigation on the failure mechanisms of surrounding rock, dominant deformation factors, and control techniques for gob-side entries with narrow coal pillars was carried out, in which the 5311 return airway of the 8311 fully mechanized caving face in Tongxin Mine was taken as the object and a comprehensive approach involving theoretical analysis, numerical simulation, and engineering practice was employed. The stability analysis results were utilized to optimize roadway design, and improved support parameters were suggested. The results indicate that the deformation of surrounding rock primarily occurs at the roof and the coal pillar side, with failure characterized by wedge-shaped rock masses falling from the roof or sliding out from the coal wall. The application of reasonable bolt-cable support in gob-side entries can effectively prevent the propagation of surrounding rock deformation, suppress unstable roadway deformation, and significantly enhance the stability of the surrounding rock. The findings provide a theoretical basis and engineering reference for the optimization support design of narrow coal pillar gob-side entries under similar geological conditions.
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基本信息:
DOI：
中图分类号:TD322.4;TD353
引用信息:
[1]白志云,赵铁林,张学亮等.特厚煤层综放开采沿空掘巷围岩稳定性分析[J].中国科技论文,2025,20(08):651-663.
基金信息:
国家重点研发计划资助项目(2023YFC2907501)