煤与瓦斯突出是矿井灾害中一种破坏性巨大的瓦斯动力现象，严重威胁煤矿安全生产。煤层渗透性是综合反映煤层特性的重要参数，利用自主研发的多功能煤与瓦斯突出模拟试验系统，开展了不同渗透率条件下(1.38×10⁻¹⁵、6.69×10⁻¹⁵、7.34×10⁻¹⁵和9.10×10⁻¹⁵ m²)煤与瓦斯突出物理模拟试验。结果表明：随着煤层渗透率的增加，突出两相流运移形态逐渐由栓流演变为分层流和沙丘流，且煤粉运移速度及其峰值逐渐降低，由1.38×10⁻¹⁵ m²条件下31.98 m/s减小为9.10×10⁻¹⁵ m²条件下20.10 m/s；伴随突出两相流运移产生的冲击波呈现阶段式演化特征，对应负相压区间冲击波超压谷值的最大绝对值大于正相压区间冲击波超压峰值，且在巷道前端随煤层渗透率的增加而下降；4次试验对应相对突出强度分别为75.63%、44.65%、38.01%、10.97%，拟合得到相对突出强度随煤层渗透率增大呈指数下降关系。理论分析认为，瓦斯压力梯度是以渗透力的形式作用于煤体，而煤层渗透性主要是通过影响瓦斯渗透力动态变化，进而影响煤与瓦斯突出强度以及突出两相流运移状态；随着煤层渗透率的增加，瓦斯流动受到的阻力减小，瓦斯压力下降较快，难以形成高瓦斯压力梯度，同时暴露面附近的瓦斯渗透力较低，并快速向远处转移，无法进一步破坏暴露面煤体，导致突出强度下降，甚至不发生突出。最后，从瓦斯压力梯度和瓦斯渗透力的角度系统探讨了煤与瓦斯突出全过程演化特征，得出煤层渗透率在突出各个阶段均占据重要作用，结合我国煤与瓦斯突出预测现状及难题，认为煤层渗透率有望成为突出预测新指标，关键在于如何结合煤矿现场实际条件确定其临界值，分别从试验研究、理论分析和工程实践等方面提出了未来展望。

Coal and gas outburst is a destructive gas dynamic disaster in coal mines, which seriously threatens the safety of coal mine production. Coal permeability is an important parameter that comprehensively reflects the characteristics of coal seams. The coal and gas outburst experiments under different permeability conditions (1.38×10⁻¹⁵、6.69×10⁻¹⁵、7.34×10⁻¹⁵和9.10×10⁻¹⁵ m²) were carried out using the self-developed multi-functional test system for coal and gas outburst simulation. The results show that with the increase of permeability of coal seam, the migration form of outburst two-phase flow gradually changes from bolting flow to stratified flow and dune flow, and the migration velocity and peak value of pulverized coal decrease gradually, from 31.98 m/s under 1.38×10⁻¹⁵ m² condition to 20.10 m/s under 9.10×10⁻¹⁵ m² condition. The shock wave generated by the outburst two-phase flow migration exhibits a phased evolution characteristic. The maximum absolute value of the valley value of shock wave overpressure in the negative phase pressure range is greater than the peak value of shock wave overpressure in the positive phase pressure range, and decreases at the front end of the roadway with the increase of coal seam permeability. The relative outburst strengths of four experiments are 75.63%, 44.65%, 38.01%, and 10.97%, respectively, and the fitting results show that the relative outburst strength decreases exponentially with the increase of coal seam permeability. According to the theoretical analysis, the gas pressure gradient acts on the coal in the form of seepage force, and the permeability of coal seam mainly affects the dynamic change of seepage force, and then affects the outburst strength of coal and gas outburst and the migration state of outburst two-phase flow. With the increase of coal seam permeability, the resistance to gas flow decreases, and the gas pressure decreases rapidly, making it difficult to form a high gas pressure gradient. At the same time, the seepage force near the exposed surface is low and quickly transfers to the distant location, unable to further damage the exposed coal seam, resulting in the decrease of outburst strength or even no outburst. Finally, from the perspectives of gas pressure gradient and gas seepage force, the evolution characteristics of the entire process of coal and gas outburst are systematically explored. It is found that coal seam permeability plays an important role in each stage of outburst. Combined with the current situation and difficulties in predicting outbursts in China, it is believed that coal seam permeability is expected to become a new indicator for predicting coal and gas outbursts. The key lies in determining the critical value based on the actual conditions of the coal mines, and the future prospects from experimental research, theoretical analysis, and engineering practice are proposed.