煤样粒径对初始释放瓦斯膨胀能影响的试验研究  

Experimental Study on Influence of Particle Diameter on Initial Expansion Energy of Released Gas

作　　者：徐乐华[1] 蒋承林[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤矿安全》2015年第4期20-22,26,共4页Safety in Coal Mines

摘　　要：为研究煤样粒径对初始释放瓦斯膨胀能的影响,对薛湖煤矿二2煤层不同粒径（0.5〈-1、1〈-2、2〈-5、5〈-10、10〈-15 mm）的煤样在同一温度条件下测定它们的初始释放瓦斯膨胀能。结果表明,任一粒径的煤样均随瓦斯压力的增大,具有的初始释放瓦斯膨胀能增大;在相同的瓦斯压力条件下,煤样的初始释放瓦斯膨胀能与平均粒径大致成负指数下降的关系,煤样粒径越大,初始释放瓦斯膨胀能越小,反之亦然。所以,煤体在地应力作用下破坏后平均粒径越小,发生突出的危险性越大。研究结果证实了降低煤层瓦斯压力和通过煤体固化提高煤体强度均可降低煤层突出危险性。In order to study the influence of the particle diameter on the initial expansion energy of released gas ,the initial expansion energy of released gas of coal sample with different particle diameters（0.5 〈 - 1, 1 〈 - 2,2 〈 - 5,5 〈 - 10,10 〈 - 15 mm） in Ⅱ 2 coal seam of Xuehu Coal Mine was determined under the same temperature condition. The results show that the relationship between the initial expansion energy of released gas and the gas pressure is adequately described by the linear equation for every sample. There is negative exponential function between the initial expansion energy of released gas and the average particle diameter under the same gas pressure condition. The greater the average particle diameter is, the smaller the initial expansion energy of released gas is, and vice versa. Thus, after the destruction of ground stress for coal, the smaller the average particle diameter is, the higher the outburst risk is. The conclusions above prove that the outburst risk can be reduced by coal seam gas pressure relief and increasing the coal strength after solidifying.

关 键 词：煤与瓦斯突出 粒径 初始释放瓦斯膨胀能 地应力 瓦斯压力 

分 类 号：TD713.2[矿业工程—矿井通风与安全]