陈鲜展. 突出口径对煤与瓦斯突出强度影响研究[J]. 中国矿业, 2017, 26(10): 156-159.
    引用本文: 陈鲜展. 突出口径对煤与瓦斯突出强度影响研究[J]. 中国矿业, 2017, 26(10): 156-159.
    CHEN Xianzhan. Research on the intensity of coal and gas outburst influenced by outburst caliber[J]. CHINA MINING MAGAZINE, 2017, 26(10): 156-159.
    Citation: CHEN Xianzhan. Research on the intensity of coal and gas outburst influenced by outburst caliber[J]. CHINA MINING MAGAZINE, 2017, 26(10): 156-159.

    突出口径对煤与瓦斯突出强度影响研究

    Research on the intensity of coal and gas outburst influenced by outburst caliber

    • 摘要: 改进大型煤与瓦斯突出模拟试验装置,增加两个气体压力传感器和两个温度传感器,进行突出口径分别为10 mm,30 mm,50 mm的煤与瓦斯突出模拟试验。试验结果表明:在0.75 MPa瓦斯压力条件下,突出口径为10 mm时没有发生煤与瓦斯突出,突出口径为50 mm和30 mm时发生煤与瓦斯突出,突出煤体质量分别为25.40 kg和15.05 kg。随着突出口径的减小煤与瓦斯突出的煤量减少,突出强度降低。突出口径的大小影响煤体突出的状态,突出口径越大,煤体突出的距离越远,破坏性也越高。突出后煤样中粒径在1.6~5.0 mm范围内的煤颗粒比例减小,而粒径小于0.75 mm的煤颗粒比例增加,体现了突出过程中的破碎功,具有较强的粉碎性。突出口径越大,煤体越易于破裂失稳并发生煤与瓦斯突出,煤体中瓦斯的放散受突出口径的影响,使煤体中瓦斯压力梯度变化趋势不同。突出口径越大,瓦斯压力降低越快,瓦斯对煤体的粉碎性越明显,突出强度也越大,突出过程中煤体温度也发生变化,说明突出口径影响含瓦斯煤的破断失稳和突出特性。

       

      Abstract: The large-scale experimental apparatus for simulating coal and gas outburst was improved by inserting two gas sensors and two temperature sensors.Then, the coal and gas outburst test was conducted by altering the outburst orifices which are 10 mm, 30 mm, 50 mm separately in diameter.The result show that when the gas pressure was 0.75 MPa, the coal and gas outburst did not occur as the outburst caliber was 10 mm; However, it took place as outburst caliber were 50 mm and 30 mm under same gas pressure and the weight of outburst coal were 25.40 kg and 15.05 kg respectively.It is obvious that the amount of coal goes down with decrease of outburst caliber, so does outburst intensity.Besides, the size of outburst caliber affects outburst condition, namely the outburst distance and destructiveness increases as caliber size adds.Additionally, the proportion of coal particle whose size ranges from 1.6 mm to 5.0 mm declines after outburst, while the one whose size is smaller than 0.75 mm increases, which indicates that strong crushing energy appears during outburst.Moreover, as the outburst caliber increases, coal body tends to failure, leading to coal and gas outburst, and the release of gas in coal is influenced by caliber, which further affects the variation tendency of gas pressure.With the increase of outburst caliber, the decline of gas pressure quickens and crushing effect that gas exerts on coal gets more apparent.In addition, the temperature of coal changes as well during outburst, which can be accounted by the theory that outburst caliber influences failure and outburst characteristics of gassy coal.

       

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