掘进工作面瓦斯流动规律数值模拟分析

研究煤层巷道掘进过程瓦斯流动规律对认识掘进巷道瓦斯涌出规律和瓦斯治理具有重要的理论意义和现实意义。本文通过建立流固耦合模型,考虑煤与瓦斯流固耦合作用,进行了不同掘进长度,掘进工作面瓦斯压力分布规律,瓦斯压力梯度改变以及瓦斯流动规律的数值模拟研究。研究表明,掘进巷道周边煤层瓦斯压力随煤壁暴露时间的增长逐渐降低,采掘活动对工作面前方煤体的影响范围达30m。并且越靠近煤壁瓦斯压力梯度越大,在距离巷帮5m范围内,瓦斯压力变化幅度最大。煤壁瓦斯流速随巷道掘进长度的增加先增加后减小,最后瓦斯流速趋于稳定。掘进工作面瓦斯流动规律的研究为矿井瓦斯治理提供安全可靠的依据,保证矿井安全生产。

Numerical simulation of flowing gas on heading face during coal mining

Discuss the gas flow law in coal seam around a developing roadway has important theoretical and realistic significance.Establish fluid-solid coupling model,considering the fluid structure interaction effect,simulate the gas pressure distribution、gas pressure gradient change and gas flow law on coal face under the different excavation length.Simulation results reveal,the gas emission rate from the roadway surface decreases with the elapse of the exposure time,mining activities have effect on the front of the coal mining face up to 30m,and the closer the coal wall gas pressure gradient,gas velocity is larger.At the range of 5m,the gas pressure has the biggest change.Gas velocity l with the length of the roadway drivage first increased and then reduced,finally become stability.Study the flowing gas on heading face provide safe and reliable basis for gas control in deep level to make sure that the mining is safe.