煤与瓦斯延期突出模拟试验及机理

利用自行研发的"大型煤与瓦斯突出模拟试验台",进行了非均衡荷载的无扰动和钢球捶击扰动情况下的煤与瓦斯延期突出试验.结果表明:延期突出过程可划分为准备、发生、发展和结束4个阶段,突出煤粒表现出很好的分选性,突出后的煤岩体可分为突出孔洞、松动区和未动区3个部分;在外力诱导作用下,延期突出门槛值降低,发生突出的可能性增大;发生延期突出的临界瓦斯压力和水平应力呈线性关系,临界瓦斯压力和突出强度呈非线性关系.重新定义了煤与瓦斯延期突出概念:在主要破煤岩作业结束形成新的采掘空间一段时间后或人员在从事辅助作业时,发生的煤与瓦斯突出;并根据试验结果初步分析了延期突出机理.

Simulation and analysis of mechanics of coal and gas delay outburst

By using the large-scale test device for coal and gas outburst simulation, the experiments of coal and gas delay outburst are conducted under the conditions of no disturbance and ball stricked disturbance of unbalanced load. The results show that delay outburst has four stages: preparation, occurrence, development and dissolution. The coal particle of outburst has size classification. The outburst coal can be divided into three parts: outburst holes, disturbed and no disturbed zone. The threshold value of delay outburst decreases and outburst possibility increases under the disturbance. The critical gas pressure has linear relation with the horizontal stress of delay outburst. The relationship between the intensity of outburst and the critical gas pressure is nonlinear. The conception of coal and gas delay outburst is redefined as the coal and gas outburst that is occurred when the main breaking coal or rocks works completed and the new mining spaces formed or when the auxiliary operation finished. The preliminary analysis of mechanics of coal and gas delay outburst is also presented.