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25041工作面有些抽放孔瓦斯浓度达90%,而临近孔抽放浓度却非常低,仅10～20%。在此次煤与瓦斯压出之前也曾出现过瓦斯异常,工作面回风巷瓦斯浓度瞬时值出现过超限现象,达1.21%～2.5%,但利用钻孔瓦斯涌出初速度法检验,q值最大3.5L/min,均小于临界值5.0L/min,虽然从2009年4月20号开始工作面瓦斯涌出量开始增大,由原来的平均3.0m~3/min增加到了4.8m~3/min左右,但未超过5.0m~3/min。此次低指标煤与瓦斯压出证明该工作面煤层瓦斯赋存的不均匀性和瓦斯抽放的不均衡性。25041工作面地质条件复杂,构造煤厚变化大,瓦斯含量高而且瓦斯分布不均衡,属典型的煤与瓦斯突出带。低指标煤与瓦斯压出现象是今后瓦斯地质基础研究的新任务,要求务必搞好煤与瓦斯的突出预测预防工作。
Some pumping holes at 25041 face have a 90% porosity and the concentration of nearby holes is very low, only 10-20%. In the coal and gas out before there have been gas anomalies, gas return airways near the face of the instantaneous value of over-limit phenomenon has occurred, up to 1.21% ~ 2.5%, but the use of drilling gas emission initial velocity test, q The maximum value of 3.5L / min, are less than the critical value of 5.0L / min, although from April 20, 2009 began to increase the gas emission from the face, from the original average of 3.0m ~ 3 / min increased to 4.8m ~ 3 / min or so, but not more than 5.0m ~ 3 / min. The low index of coal and gas out to prove that the face coal seam gas reservoir heterogeneity and gas drainage is not balanced. 25041 is a typical coal and gas outburst with complicated geological conditions, large changes in coal thickness, high gas content and uneven gas distribution. The low index of coal and gas outburst is the new task of gas geological basic research in the future, which calls for doing a good job in predicting and preventing coal and gas.