摘要
为分析回采采空区漏风强度与氧浓度分布特征,用非均质漏风渗流方程和氧浓度耗散方程建立了冒落采空区漏风流态和氧浓度变化的有限元数值模型,结合观测数据进行了求解;工作面附近流场按冒落介质和冒落空隙间的双流层问题处理。得到采空区内部进、回风侧两端的氧浓度分布是不均衡的,而导致这一现象的原因是采空区漏风流的沿程耗氧和瓦斯的涌出;指出采空区内进、回风两侧端的漏风强度分布基本是均衡的,当考虑瓦斯涌出的影响时,漏回风侧的漏风强度甚至要高于进风侧。从流体力学原理上对现场观测采空区内部进回风两侧氧浓度分布的不均衡给予更合理地解释。此结论将有助于澄清当前学术界对此问题的模糊认识。
In order to analyze air leakage strength and oxygen concentration distribution characteristics of stoping goal, finite element model of caving goal air leakage flow pattern and oxygen concentration variation is established with heterogeneous .air leakage seepage equation and oxygen concentration dissipation equation and resolved against observed data, and the flow field near working face is treated as two- flow layer flow between caving medium and caving slack. The resuilt indicates that the oxygen concentration distribution between the inlet and return sides in the goal is unbalanced, which is because of the road oxygen consumption and methane effusion of goal air leakage flow. It is indicated that air leakage strength distribution between the inlet and return sides is basically balanced, and when the methane effusion is considered, the air leakage strength of the return side is even higher than the inlet side. The disproportion of the oxygen concentration between the inlet and return sides inside the goal observed in the field is rationally explained from fluid mechanics principle. This conclusion conduces to clarify the fuzzy cognition against this issue in the current academic circle.
出处
《中国矿业》
北大核心
2006年第9期91-94,共4页
China Mining Magazine
关键词
采空区场流
自燃氧化
氧浓度分布
漏风流态
数值模拟
Goal flow field Spontaneous combustion oxidization Oxygen concentration distribution Air leakage flow pattern Numerical simulation
