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A Study on the roof fracture mechanism of large cutting height workface in shallow thick coal seam

机译：浅埋煤层大切削高度工作面屋顶断裂机理研究

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摘要

Based on the high mining height of large cutting height workface in shallow thick coal seam and the few falling waste rock in goaf, the key roof can not be supported effectively, the facture mechanical model of key roof was established. The theoretical calculation formula of key stratum fracture step and working resistance of support were obtained by using fracture mechanics. The results show that the fracture step of key roof relate to not only the mechanical character of key roof and the load of overlaying rock seam, but also the working resistance of support and horizontal pressure in key roof. The reasonable working resistance of support and the step of roof fracture were analyzed in 1-2coalmine 51104 face of a mine in Dongsheng area. The theoretical results are well agreeable with the field measured results.
机译：基于大型切割高度工作面的高采矿高度在浅厚煤层和少数落叶岩石中，钥匙屋顶无法有效地支持，建立了钥匙屋顶的机械模型。通过使用裂缝力学获得键角裂缝步骤和载体的工用抗性的理论计算公式。结果表明，关键屋顶的断裂步骤不仅涉及钥匙屋顶的机械特性和覆盖岩缝的负荷，还涉及钥匙屋顶的支撑和水平压力的工程阻力。在东升地区的一个矿井面对1-2Coalmine 51104面上分析了载体的合理锻炼性能和屋顶骨折的步骤。理论结果与现场测量结果很好。

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