Exploration of petrographic, elemental, and material properties of dynamic failure-prone coals
Exploration of petrographic, elemental, and material properties of dynamic failure-prone coals
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DOI：
10.1016/j.ijmst.2019.12.015
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发表时间：
2020-01
影响因子：
11.8
通讯作者：
Heather E. Lawson
中科院分区：
文献类型：
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作者：
Heather E. Lawson
本研究的目的是探索煤炭的地球化学和岩相成分如何影响其物理性质，以及这些如何与煤矿中可报告的动态破坏历史相关。动态破坏事件，也称为碰撞、反弹或爆裂，是采矿环境中岩石的爆炸性破坏。这些事件突然发生，通常没有任何警告，导致工人受伤，并通过矿山安全和健康管理局（MSHA）超过60%的可报告案例中包括死亡。使用公开的数据集，其中包括成分的地理，强度，和哈德格罗夫可磨性指数（HGI）数据的变量数据库进行编译。结果表明，与未发生碰撞的煤相比，碰撞煤的成熟度较低，碳含量较低，氧含量较高，较软，且不太清楚。高脂质体含量被发现与较高的平均单轴抗压强度（UCS）值。然而，未观察到UCS与动态失效状态之间存在明显且直接的相关性。这项研究的结果表明，煤与没有经历过可报告的动态故障事故之间存在差异。这些差异是煤炭本身固有的，与采矿引起的风险因素无关。结果进一步阐明了煤的成分属性如何影响物理性质，并开始阐明地球化学与动态破坏状态之间的潜在联系。只有通过更好地了解风险，才能制定更有效的缓解战略。
The purpose of this study is to explore how the geochemical and petrographic components of coal may impact its physical properties and how these correlate with a history of reportable dynamic failure in coal mines. Dynamic failure events, also termed bumps, bounces, or bursts, are the explosive failures of rock in a mining environment. These events occur suddenly and often with no warning, resulting in worker injury up to and including fatality in greater than 60% of reportable cases through the Mine Safety and Health Administration (MSHA). A database of variables was compiled using publicly available datasets, which includes compositional geographic, strength, and Hardgrove grindability index (HGI) data. Results indicated that bumping coals were less mature, lower in carbon, higher in oxygen, softer, and less well cleated than coals that did not bump. High liptinite content was found to correlate with higher average uniaxial compressive strength (UCS) values. However, no clear and direct correlation between UCS and dynamic failure status was observed. The findings of this study established that differences existed between coals that had versus had not experienced reportable dynamic failure accidents. These differences were inherent to the coal itself and were independent of mining-induced risk factors. Results further illuminated how compositional attribute of coal influenced physical properties and began to clarify potential links between geochemistry and dynamic failure status. Only through the better understanding of risk can more effective mitigating strategies be enacted.