摘要
为探究平煤十矿己15-24080机巷掘进工作面煤层合并分叉线附近突出瓦斯流在交叉巷道中的传播规律与运移特征,结合现场实际构建了仿真模型,分析了突出瓦斯的逆流特性与爆炸危险区的分布情况。研究表明:突出瓦斯流在风流、浓度扩散和惯性力的作用下运移,随着瓦斯气流逼近巷道交叉区域,其影响范围先增大后减小,瓦斯峰值浓度也随之降低;当突出瓦斯最大初始速度为40m/s,持续时间为5s时,产生了瓦斯逆流扩散现象,最大影响范围为25m;突出瓦斯在交叉巷道中流经气流方向紊乱和压力较低的涡旋区域时,浓度曲线表现出转折分布特征,部分瓦斯呈现逆流-回流规律。
To explore the law of diffusion and migration characteristics of gas flow in the in- tersection roadway with the gas outburst occurrence in the near of coal seam merger and split line in the advancing face of 61s-24080 machine roadway of No. 10 Coal Mine of Pingdingshan coal in- dustry company, the simulation model was constructed combing with the actual situation, the characteristics of adverse outburst gas flow and the distribution of explosive hazardous area were analyzed. The studies show that the outburst gas flow migrates under the effect of air flow and concentration diffusion and the action of inertia force, as the gas airflow approaches the intersec- tion area of roadway, the its influence scope first increases then decreases, the gas peak concen- tration also decreases; the adverse gas flow phenomenon happens and the maximum adverse gas flow scope is 25 m when the maximum initial velocity of gas flow is 40 m/s and duration time is 5 s the outburst gas flows airflow direction disorder and low pressure vortex area and the break in the concentration curve, the partial gas appears adverse flow-return flow characteristics.
出处
《中国煤炭》
北大核心
2015年第10期97-102,共6页
China Coal
基金
国家自然科学基金资助项目(51274206)
国家自然科学青年基金资助项目(51404277)
中央高校基本科研业务费资助项目(3142015004)
关键词
瓦斯突出
扩散运移
交叉巷道
逆流
爆炸危险区
gas outburst, diffusion and migration, intersection roadway, adverse gas flow,explosive hazardous area
