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为确定合理的煤层瓦斯含量测定取样深度,建立考虑剪胀及软化特性的巷道周围煤体弹塑性模型,得到了煤层瓦斯含量测定取样最小深度的表达式,并进行实际验证,分析了取样深度的主要影响因素。结果表明:控制最小取样深度的主要因素为初始地应力、支护应力、煤体强度和巷道尺寸;埋藏深度越大,取样深度应越长;煤质越软,取样深度应越长;取样深度随支护应力的减小而增大;在大断面巷道,应增加取样深度。
In order to determine the sampling depth of reasonable coal seam gas content and establish the elastic-plastic model of coal surrounding the roadway considering the dilatancy and softening characteristics, the minimum sampling depth of gas content in coal seam was obtained and verified. The sampling depth the main factor of influence. The results show that the main factors controlling the minimum sampling depth are initial stress, supporting stress, coal strength and roadway size. The larger the depth of burial, the longer the sampling depth. The softer the coal, the longer the sampling depth. The depth of sampling With the support stress decreases and increase; large section of roadway, should increase the sampling depth.