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为比较煤层瓦斯含量与瓦斯压力预测区域突出危险的敏感程度,合理选择区域突出危险预测指标,引入瓦斯含量相对变化率的概念,推导出瓦斯含量相对变化率的表达式。采用单因素敏感性分析法,找出瓦斯含量相对变化率的关键影响因素。绘制瓦斯含量相对变化率与瓦斯压力的关系曲线。得出煤层瓦斯含量指标区域预测比瓦斯压力敏感的条件是,瓦斯含量相对变化率W’大于1。谢一矿望峰岗井C15煤层区域突出危险预测应用表明,试验区域代表性地点W’均大于1,变化范围3.427~5.449,说明采用瓦斯含量预测区域突出危险比瓦斯压力更敏感。
In order to compare the sensitivity between the coal seam gas content and the prominent danger in the gas pressure prediction area, the reasonably selecting the prediction index of the danger prominent in the area and introducing the concept of the relative rate of change of gas content is deduced to derive the expression of the relative rate of change of gas content. Single factor sensitivity analysis was used to find out the key influencing factors of the relative rate of change of gas content. Draw the curve of the relative rate of change of gas content and gas pressure. It is concluded that the prediction of gas index in coal seam is more sensitive than gas pressure. The relative change rate of gas content W ’is greater than 1. The predicted application of the prominent danger in C15 coal seam area of Wangfeng Mine in Xiefeng Mine shows that W ’is greater than 1 and the variation range is 3.427-5.449, indicating that the prominent hazard in the prediction area of gas content is more sensitive than the gas pressure.