Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the form of the outburst, proximity to source, the structure and form of the transmitting roadways and the influence of obstacles. The following characterizes the propagation of coal and gas outbursts as two-phase gas–solid flows proximal to source where the coupled effects of pulverized coal and gas flows dominate behavior. The characteristics of shock wave propagation and attenuation were systematically examined for varied roadway geometries using experiments and numerical models. The results demonstrate that the geometry of roadway obstructions is significant and may result in partial compression and sometimes secondary overpressurization in blocked and small corner roadways leading to significant attenuation of outburst shock waves. The shock waves attenuate slowly in both straight and abruptly expanding roadways and more significantly in T-shaped roadways. The most significant attenuation appears in small angle corners and bifurcations in roadways with the largest attenuation occurring in blocked roadways. These results provide basic parameters for simplifying transport in complex roadway networks in the far-field, and guidance for the design of coal and gas outburst prevention facilities and emergency rescue.

煤与瓦斯突出物会破坏两相气固混合物，因为它们以冲击波的形式传播并从其源头流出。传播受到爆发形式，与源的接近程度，传输巷道的结构和形式以及障碍物的影响的影响。以下是煤与瓦斯突出传播的特征，因为两相气固两相流靠近煤源，煤粉与瓦斯流的耦合效应占主导地位。使用实验和数值模型，系统地检查了冲击波传播和衰减的特征，以适应各种巷道几何形状。结果表明，巷道阻塞物的几何形状很明显，可能会导致部分压缩，有时会在阻塞的小拐角巷道中产生二次过高的压力，从而导致突出冲击波的明显衰减。冲击波在笔直和突然扩展的巷道中衰减缓慢，而在T形巷道中衰减更为明显。最显着的衰减出现在巷道的小角度拐角和分叉处，最大的衰减出现在阻塞的巷道中。这些结果为简化远距离复杂道路网络中的运输提供了基本参数，并为煤和瓦斯突出预防设施的设计和紧急救援提供了指导。冲击波在笔直和突然扩展的巷道中衰减缓慢，而在T形巷道中衰减更为明显。最显着的衰减出现在巷道的小角度拐角和分叉处，最大的衰减出现在阻塞的巷道中。这些结果为简化远距离复杂道路网络中的运输提供了基本参数，并为煤和瓦斯突出预防设施的设计和紧急救援提供了指导。冲击波在笔直和突然扩展的巷道中衰减缓慢，而在T形巷道中衰减更为明显。最显着的衰减出现在巷道的小角度拐角和分叉处，最大的衰减出现在阻塞的巷道中。这些结果为简化远距离复杂道路网络中的运输提供了基本参数，并为煤和瓦斯突出预防设施的设计和紧急救援提供了指导。