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科技导报  2015 

瓦斯抽采钻孔受限空间内钻屑运移特征

DOI: 10.3981/j.issn.1000-7857.2015.01.008, PP. 47-51

Keywords: 瓦斯抽采,钻屑,最小启动风速,钻孔倾角

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Abstract:

应用气力输送理论,建立钻屑颗粒群孔内悬浮模型,推导钻屑颗粒群启动最小气流速度求解方程,结合案例分析钻屑颗粒直径、摩擦系数及钻孔倾角对钻屑颗粒群启动速度的影响规律.结果表明,施工俯孔时,最小启动风速存在极值θD,θDθU时,钻屑在自重作用下自行滑落;摩擦系数对最小启动风速的影响规律与钻孔倾角类似,当俯孔倾角θ=-π/2时,不同摩擦系数曲线交于同一点,表明当θ=-π/2时,最小启动风速与摩擦系数无关.

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