Distributive Characteristics of Hazards outside Mine Pithead in Gas Explosion
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摘要: 瓦斯爆炸事故对井口外部区域存在破坏作用，增加了矿井配套基础设施及相关人员的事故风险。结合典型井下瓦斯爆炸事故案例，借助计算流体力学技术对煤矿立井内瓦斯爆炸及其灾害演化过程进行了系统研究，着重考查了井口外部区域冲击波超压和温度场的时空分布特征。研究表明，瓦斯爆炸对井口外部区域的主要危险源于沿水平方向传播的爆炸冲击波，其峰值超压及波及范围随瓦斯量的增加而逐渐增大，而井口外水平方向的高温灾害不明显。研究结论能够为煤炭工业场地平面布置、煤矿安全规程、风险评估及事故调查提供必要的参考依据。Abstract: The damaging effects of gas explosions on the area outside the mine pithead incur more accident risks on the auxiliary facilities and related personnel.Combined with typical gas explosion cases and based on computational fluid dynamics technology, this paper studied the gas explosion and its evolution process in coal mines, and investigated the distributive characteristics of the shock wave overpressure and temperature field outside the pithead.The study shows that the main hazard of gas explosion incurs on the area outside the pithead originates from the explosion shock wave along the horizontal direction, and its peak overpressure and spread range increase with the gas quantity while, however, its high temperature hazard on the horizontal direction is not obvious.The conclusions provide an essential referential basis for the site surface layout for coal mining and its related risk assessment and accident investigation.
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Key words:
- gas explosion /
- shock wave /
- high temperature /
- initial premixed area /
- coal mine safety
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图 4 立井井口正上方5 m处的超压和温度分布
Figure 4. Overpressure and temperature distributions at top 5 m from the vertical shaft pithead
图 5 距立井井口水平距离10 m处的超压和温度分布
Figure 5. Overpressure and temperature distributions at horizontal distance of 10 m from the vertical shaft pithead
图 6 距井口不同水平位置处的超压-时间分布
Figure 6. Overpressure versus time distribution at different horizontal distances from the vertical shaft pithead
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