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Research on pressure-relief effort of mining upper-protective seam on protected seam

机译：采矿上保护接缝对保护接缝的压力浮雕努力研究

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Based on the mining and geological conditions in No.12 Mining District of Jining No.3 Coal Mine, the variation laws of stress and deformation of the lower-protected seam along with the mining operation of upper-protective seam are studied by numerical simulation and field test in this paper. The results show that the distribution of in situ stress in protected seam is changed correspondingly during the protective seam mining. While mining the protected seam, the vertical stresses around the protected seam experienced three stages: stress increasing before mining, decreasing after mining and stepwise steady stage. In addition, the protective seam mining can also cause expansive deformation in protected seam and its surrounding rock, destroy the strata structure and release the elastic energy in advance, thus reducing the rock burst risk in protected seam. The results of numerical analysis and the field monitoring results are basically in agreement. The study in this paper will provide theoretical basis and practical value for reasonable design and safety mining of coal seams with rock burst propensity.
机译：基于济宁3号煤矿12号矿区采矿和地质条件，通过数值模拟研究了低保护缝的应力和低置接缝变形的变形定律以及上保护接缝的开采操作本文的现场测试。结果表明，在保护煤层采矿过程中，相应地改变了保护接缝中原位应力的分布。在挖掘保护的接缝时，保护缝周围的垂直应力经历了三个阶段：在采矿前的应力增加，挖掘后逐步减少。此外，保护接缝挖掘也可能导致保护缝和周围岩石中的膨胀变形，破坏地层结构并提前释放弹性能量，从而降低了受保护接缝中的岩石突发风险。数值分析的结果和现场监测结果基本上是一致的。本文的研究将为具有岩石突发倾向的合理设计和安全挖掘提供理论基础和实用价值。

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