【摘要】 为研究煤层群联合开采条件下复合采空区氧化带分布规律,建立了包含开采工作面以及下保护层开采形成的采空区的物理模型,确定了含氧气组分的流体域控制方程,在控制采场瓦斯抽采量、煤层间漏风量前提下,设置不同配风量,利用数值模拟软件FLUENT进行采空区流场模拟,根据极限风速法,得出复合采空区氧化带具体分布.模拟结果显示,复合采空区氧化带受流场"源"、"汇"影响形成特定形态,形成偏向回风巷侧、围绕采空区留管抽采口一定区域的氧化带分布,随着配风量的增加,氧化带基本形态不变,氧化带面积经历了由增加到减小的变化过程.更多还原

【Abstract】 In order to study the distribution law of oxidation zone in composite gobs,the gob’s physical model is built,including the mining face and the formed gob below it because of protection layer mining,and governing equations are determined to control compositons transfering and fluid flow,especially O2.FLUENT known as numerical simulation software is applied to study gob flow fields with the constants of gas drainage and complicated air leakage.In addition,a series of air quantity was settled during simulation in order to study the influence of air quantity to oxidation zone distribution by limit velocity method.Through the study of simulations,it shows that the oxidation zone of composite gob under complex fluid flow has its characteristics,what is different to the law exited already,simply,the oxidation zone exited near the side of tailgate gateroads and gas drainage boreholes,the range expands and declines then when the air quantity increases sustainably,while the basic appearance keeps.更多还原