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首页> 外文期刊>Rock Mechanics and Rock Engineering >Risk Analysis and Prediction of Floor Failure Mechanisms at Longwall Face in Parvadeh-I Coal Mine using Rock Engineering System (RES)
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Risk Analysis and Prediction of Floor Failure Mechanisms at Longwall Face in Parvadeh-I Coal Mine using Rock Engineering System (RES)

机译：基于岩石工程系统（RES）的Parvadeh-I煤矿长壁工作面底板破坏机理的风险分析和预测

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摘要

The floor failure at longwall face decreases productivity and safety, increases operation costs, and causes other serious problems. In Parvadeh-I coal mine, the timber is used to prevent the puncture of powered support base into the floor. In this paper, a rock engineering system (RES)-based model is presented to evaluate the risk of floor failure mechanisms at the longwall face of E (2) and W (1) panels. The presented model is used to determine the most probable floor failure mechanism, effective factors, damaged regions and remedial actions. From the analyzed results, it is found that soft floor failure is dominant in the floor failure mechanism at Parvadeh-I coal mine. The average of vulnerability index (VI) for soft, buckling and compressive floor failure mechanisms was estimated equal to 52, 43 and 30 for both panels, respectively. By determining the critical VI for soft floor failure mechanism equal to 54, the percentage of regions with VIs beyond the critical VI in E (2) and W (1) panels is equal to 65.5 and 30, respectively. The percentage of damaged regions showed that the excess amount of used timber to prevent the puncture of weak floor below the powered support base is equal to 4,180,739 kg. RES outputs and analyzed results showed that setting and yielding load of powered supports, length of face, existent water at face, geometry of powered supports, changing the cutting pattern at longwall face and limiting the panels to damaged regions with supercritical VIs could be considered to control the soft floor failure in this mine. The results of this research could be used as a useful tool to identify the damaged regions prior to mining operation at longwall panel for the same conditions.
机译：长壁工作面的地板故障会降低生产率和安全性，增加运营成本，并引起其他严重问题。在Parvadeh-I煤矿，木材被用来防止动力支撑底座刺穿地板。在本文中，提出了一种基于岩石工程系统（RES）的模型来评估E（2）和W（1）面板的长壁面上的地板破坏机制的风险。提出的模型用于确定最可能的地板破坏机理，有效因素，损坏区域和补救措施。从分析结果可以看出，软底板破坏是帕尔瓦迪一号煤矿底板破坏机理的主导。估计软地板，屈曲地板和压缩地板破坏机制的脆弱性指数（VI）的平均值分别等于两个面板的52、43和30。通过确定软底板破坏机制的临界VI等于54，在E（2）和W（1）面板中具有超出临界VI的VI的区域百分比分别等于65.5和30。受损区域的百分比表明，为防止动力支撑底座下方的弱地板刺穿而使用的过量木材等于4,180,739千克。 RES输出和分析结果表明，动力支撑的设置和屈服载荷，工作面长度，工作面存在的水，动力支撑的几何形状，改变长壁面的切割方式以及将面板限制在具有超临界VI的损坏区域都可以考虑：控制该矿井的软底板故障。这项研究的结果可以用作在相同条件下在长壁面板上进行采矿作业之前识别受损区域的有用工具。

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