多煤层开采中的巷道布置与采煤技术适应性研究

Research on Roadway Layout and Coal Mining Technology Adaptability in Multi-coal Seam Mining

  • 摘要: 针对晋牛煤矿多煤层赋存条件下巷道布置不合理、采动扰动剧烈及工艺适配性差等问题,基于围岩控制理论与协同开采机制,采用FLAC3D数值模拟方法对分层布置与联合布置方案进行应力场与塑性区响应分析,明确不同布置结构对围岩稳定性的影响规律。在此基础上结合MG300/730-WD采煤机与ZFY6400/17/38液压支架的工艺参数,构建综采放顶煤工艺的适应性评价模型,并在10112与10113工作面开展工业性试验。结果表明,联合布置可有效降低顶板下沉与煤柱变形,提升推进效率与回采率,吨煤直接成本由178.6元/t降至165.2元/t,节约13.4元/t,为类似地质条件下多煤层协同开采提供系统化的布置优化与工艺选型依据。

     

    Abstract: Aiming at the problems of unreasonable roadway layout, severe mining disturbance, poor process adaptability and others under the occurrence condition of multiple coal seams in Jinniu Coal Mine, based on the surrounding rock control theory and collaborative mining mechanism, FLAC3D numerical simulation method is adopted to conduct response analysis of stress field and plastic zone on layered layout and joint layout schemes, and the influence laws of different layout structures on surrounding rock stability are clarified. On this basis, combined with the process parameters of MG300/730-WD shearer and ZFY6400/17/38 hydraulic support, an adaptability evaluation model for the fully mechanized top coal caving process is constructed, and industrial tests are carried out on the 10112 working face and the 10113 working face. The results indicate that the joint layout can effectively reduce roof subsidence and coal pillar deformation, improve propulsion efficiency and stoping rate, and the direct cost per ton of coal is reduced from 178.6 yuan/ton to 165.2 yuan/ton, saving 13.4 yuan/ton, which provides a systematic layout optimization and process type selection basis for multi-coal seam collaborative mining under similar geological conditions.

     

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