高突煤层突出预测敏感指标临界值及可靠性分析

Critical Values and Reliability of Sensitive Indexes for Coal and Gas Outburst Prediction

摘要: 以山西某矿4^#煤层为背景，通过实验室测定瓦斯解吸量和钻屑瓦斯解吸指标K₁和△h₂，并进行了实测验证。结果表明，在初始时刻瓦斯解吸速度较快，并且衰减较快，且吸附平衡压力越大，瓦斯解吸速度越快，瓦斯解吸总量越大。随着瓦斯吸附平衡压力的增大，钻屑瓦斯解吸指标K₁和△h₂也逐渐增大，且K₁和△h₂的变化趋势具有较好的一致性，确定K₁和△h₂的临界值分别为0.22 mL/(g·min^0.5)、170 Pa。实验室和现场实测数据均认为△h₂比K₁更敏感可靠。

Abstract: Taking 4^#coal seam of a mine in Shanxi as background, the gas desorption amount and cutting gas desorption index and were measured in laboratory，and verified by data obtained from production field. Results show that the gas desorbs rapidly with fast weakening speed and the larger balanced absorption pressure at the initial moment; the faster of gas desorption speed and the larger of gas desorption amount. With the increasing of gas adsorption equilibrium pressure,and also enlarge with change trends.The critical values of k₁ and △h₂are 0.22 ml/(g·min^0.5) and 170 Pa and △h₂ is more reliable than K₁.