特厚煤层坚硬顶板初次破断特征的力学分析
Mechanical Analysis of the First Fracture Characteristics of Hard Roof of Extra-thick Coal Seam
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摘要: 为了揭示特厚煤层综放工作面坚硬顶板破断与矿压显现的力学机制,基于材料力学与岩石力学等理论,建立了特厚煤层综放开采坚硬顶板初次破断力学分析模型,分析了特厚煤层综放开采坚硬顶板中弯矩的分布情况,推导了坚硬顶板超前破断位置与初次破断距的解析公式,系统研究了煤层厚度、顶板厚度、顶板弹性模量、顶板强度等关键因素对顶板初次破断特征的影响规律。结果表明:特厚煤层综放工作面坚硬顶板的初次破断距与煤层厚度呈负相关的关系,而与顶板厚度、顶板弹性模量、顶板强度呈正相关的关系。在此基础上,开展了山西韩家洼煤矿特厚煤层22203综放工作面矿压规律的现场监测,并将理论分析结果与现场监测数据进行对比分析,两者基本吻合。Abstract: In order to investigate the failure mechanisms of the hard roof in the fully mechanized caving face in the extra-thick coal seam, the mechanical analysis model of the first breaking of the hard top roof in the fully mechanized caving mining of the extra-thick coal seam was developed based on the theory of material mechanics and rock mechanics, and the distribution of the bending moment in the hard roof was analyzed. Moreover, the analytical formulas of the position and distance of the first breaking of the hard roof were derived, and the influence of the key factors such as the thickness of the coal seam, the thickness of the roof, the elasticity modulus of the roof and the strength of the roof on the characteristics of the first breaking of the roof were studied systematically. The results show that the first rupture distance of the hard roof is negatively correlated with the thickness of coal seam, but positively correlated with the thickness, elastic modulus and strength of the hard roof. On this basis, the on-line monitoring of the ground pressure law in the 22203 super-thick coal seam fully mechanized top coal caving face of Hanjiawa Coal Mine in Shanxi Province was carried out. The theoretical analysis results were compared with the on-site monitoring data, and the two were basically consistent.
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Keywords:
- extra-thick coal seam /
- hard roof /
- first break distance /
- mechanical model /
- material mechanics /
- rock mechanics
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