不同煤粒粒级配比下的煤与瓦斯突出实验研究

Experimental study on the influence of coal particle size on coal and gas outburst

根据煤与瓦斯突出"综合假说"理论,煤的物理力学性质在突出过程中扮演着重要的角色。利用大型煤与瓦斯突出模拟试验台为工具,选用粒径为5-10目、10-40目、40-80目,以及5-10目和10-40目不同粒级配比下的煤粒,在相同实验参数条件下制作成突出煤样,并分别进行煤与瓦斯突出模拟实验。结果表明:煤层吸附瓦斯是放热过程,煤体温度会不断增加,突出过程则正好相反。煤体的破碎程度越大(粒径越小),突出危险性程度就越高、发生突出的强度就越大;但突出强度大并不一定表现为粉碎率高,原因在于煤的破碎程度越高,进一步破碎的难度就越大,要达到相同破碎率所需的能量就越大。

According to the ＂combined effects hypothesis＂ theory of coal and gas outburst,the physical and mechanical properties of coal play an important role in this process.Using the ＂large-scale coal and gas outburst simulation test bed＂ as tool,choosing the particle size 5-10 mesh,10-40 mesh,40-80 mesh,and two different proportions of 5-10 mesh mixed with 10-40 mesh to make the outburst coal sample in the same experimental parameters,the coal and gas outburst simulation experiments were conducted respectively.These results showed that： ①coal bed adsorption gas is an exothermic process,the coal temperature will continue to increase,outburst process is the opposite,②the smaller the coal particle size is,the greater the intensity of its outburst is,and the more weakly the crushing capacity of outburst operates on the coal.