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首页> 外文会议>International symposium on progress in safety science and technology;2010 ISSST >Simulation on Influencing Factors of 'Three Zone' Distribution in Goaf of Top Coal Caving Face
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Simulation on Influencing Factors of 'Three Zone' Distribution in Goaf of Top Coal Caving Face

机译：放顶煤采空区“三带”分布影响因素模拟。

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摘要

In order to learn about the trait of "three zone" distribution in goaf of top coal caving face, a new mathematical models of filtration flow fields in goaf were established by taking advantage of ventilation network theory. Numerical simulation on influencing factors of "three zone" was made and analyzed in adoption with the index of extreme wind velocity. The result indicates the form and sphere of "three zone" is concerned with air flow volume of working face, wind resistance of working face, mining movement velocity of working face, property of inbreak rock, air leakage volume and gas drainage lancway. With the increase of air flow volume of working face, air leakage volume into goaf, mining movement velocity of working face and wind resistance of working face, width of oxidation zone gets broadened. While lithology coefficient of adjoining rock increases, width of oxidation zone diminishes. Gas drainage laneway exerts vital influence on the form and distribution of "three zone". The oxidation zone will broaden after gas drainage laneway is excavated. The shorter is the distance between gas drainage laneway and air return laneway, the larger is the sphere of its influence, and the wider is the oxidation zone. The findings can provide significant instructions for the prevention of coal spontaneous combustion.
机译：为了解顶煤工作面采空区“三带”分布的特点，利用通风网理论建立了采空区过滤流场的数学模型。对“三带”影响因素进行了数值模拟，并采用极限风速指标进行了分析。结果表明，“三带”的形式和球形与工作面的风量，工作面的风阻，工作面的采动速度，侵入岩的性质，漏风量和瓦斯抽放巷道有关。随着工作面风量的增加，采空区漏风量的增加，工作面的采掘运动速度和工作面的抗风性，氧化区的宽度逐渐扩大。随着毗邻岩石的岩性系数的增加，氧化带的宽度减小。瓦斯抽放巷道对“三带”的形式和分布产生重要影响。开挖瓦斯抽放巷道后，氧化带将变宽。瓦斯抽放巷道与回风巷道之间的距离越短，其影响范围越大，氧化区越宽。这些发现可以为预防煤自燃提供重要指导。

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