瓦斯含量在突出过程中的作用分析

Analysis of the gas content in the coal and gas outburst

为了研究瓦斯含量在煤与瓦斯突出过程中的作用,采用能量法分析煤与瓦斯突出过程中的能量关系、掘进进尺为L时煤体的应力条件与弹性变形潜能和煤层瓦斯积聚内能的释放功,研究了煤与瓦斯突出时的抛出功、破碎功和瓦斯突出的动能,得到了煤与瓦斯突出的能量条件。并以贵州化处煤矿二采区突出为例,对煤与瓦斯突出的能量条件进行分析。研究结果表明:煤与瓦斯突出的能量来源为瓦斯内能,瓦斯内能做功比弹性潜能做功大。煤层的地应力越大,坚固性系数越小,发生突出时所需煤层的瓦斯含量越小;在地应力一定的情况下,进尺越大突出时临界瓦斯含量越小;煤层的厚度对突出时的临界瓦斯含量的影响不明显。

The energy changes in the processes of coal and gas outbursts were studied using the principle of energy conservation.The stress conditions,potential energy of elastic deformation were analyzed when digging distance was L.The released work from the accumulated internal energy of coal gas was specially studied.Also the energy used to throw the fragments of the coal,fracturing energy and kinetic energy of the gas were investigated,and the energy condition for coal and gas outburst was obtained.Took the 2nd mining area in Huachu Coal Mine of Guizhou Province as an example,studied the energy conditions of outburst.The results show that gas internal energy which is the main energy source for the outburst is bigger than potential energy of elastic deformation.An outburst with less critical gas content is more likely to happen in the following conditions：The higher stress in coal seam is,The smaller Protodyakonov coefficient is.Under the stress level in certain circumstances,outburst will happen with little critical gas content after the long digging distance.The influence of coal seam thickness for the critical gas content in outburst is not obvious.