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Profile of groundfall incidents in underground coal mines

机译：地下煤矿的地面事故概况

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Between 1995 and 2001, groundfall incidents resulted in 69 fatalities and were responsible for 47 percent of all deaths in U.S. underground bituminous coal mines. To better understand where and why these incidents occur a comprehensive analysis of groundfall injuries and reportable non injury roof falls was conducted. Using U.S. Mine Safety and Health Administration (MSHA) data from 1995 through 2001, the study examined (he effects of mining method, mine size, seam thickness and season on roof- and rib-fall injury rates and reportable non injury roof-fall rates. In addition, for the first time, groundfall rates were calculated for individual coal beds. The study found that room-and-pillar mines had significantly higher groundfall rates than longwall mines. Small room-and-pillar mines with less than 50 workers were found to have high groundfall fatality rates. Another significant conclusion was that high groundfall rates occurred in regions where there were numerous problematic coal beds, such as in the Illinois Basin. This appears to correlate to other studies that have shown that the compressive strengths of typical roof rocks in the Illinois Basin are much lower than those of their counterparts in the central Appalachian coalfields. Finally, roof-fall rates nationwide were found to be 50 percent higher between July and September possibly because of changes in humidity levels that may be causing shale mine roofs to deteriorate.
机译：在1995年至2001年之间，地面事故导致69人死亡，是美国地下烟煤死亡人数的47％。为了更好地了解这些事件发生的地点和原因，并对地面坠落事故和可报告的无伤害屋顶坠落进行了综合分析。该研究使用1995年至2001年的美国矿山安全与健康管理局（MSHA）数据，研究了（采矿方法，矿山尺寸，煤层厚度和季节对顶板和肋骨坠落伤害率以及可报告的无伤害顶板坠落率的影响。此外，这是首次计算了单个煤层的落下率，研究发现，房柱式矿井的落地率明显高于长壁矿井，而工人数少于50人的小型房柱式矿井的落地率要比长壁矿井高。另一个重要的结论是，在有大量有问题煤层的地区（例如伊利诺伊斯盆地），发生了很高的地面降落率，这似乎与其他研究表明了典型的抗压强度有关。伊利诺伊州盆地的顶板岩石远低于阿巴拉契亚中部煤田的顶板岩石，最后发现全国范围的顶板下降率为50％h。在7月到9月之间可能是因为湿度水平的变化可能导致页岩矿顶的恶化。

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