The haulage roadway of the F₁₅-22080 working face, No.8 mine is situated within a special non-uniform stress zone. In this area, the extraction-boreholes drilling process frequently triggers coal and gas outburst. Against this background, this study systematically conducted high-pressure gas adsorption experiments and high-pressure gas desorption experiments on coal samples collected from different stress zones and obtained their adsorption/desorption characteristics. Subsequently, coal pore structure characteristics at various scales were investigated by employing scanning electron microscopy, low-pressure N₂ adsorption and low-pressure CO₂ adsorption techniques and fractal analysis to assess the impact of varying stress levels. On this basis, a comprehensive analysis was carried out to explore the connections between stress, pore structure, adsorption/desorption traits, and the risk of outburst. The results indicate that, with increasing stress, the Protodyakonov coefficient f and the Langmuir pressure P_L decrease, while the index of diffusion initial velocity of coal gas Δp and the Langmuir volume V_L increase. The desorption amount and rate of gas also increase significantly. The total pore volume and specific surface area of micropores increase, while those of mesopores and macropores show an overall decreasing trend. The surface fractal dimension D_F1 increases by 9%, the spatial fractal dimension D_F2 decreases by 5.2%, and the volume fractal dimension D_SIE increases by 1%. The induced stress leads to a decrease in the abundance of macropores and mesopores, with concurrent increase in micropores. The V_L exhibits a linear increase with the D_SIE, whereas the P_L demonstrates a linear decrease with it. The initial desorption rate rises with the reduction of the D_F2 and the increase of the D_SIE. The influence of superimposed-stress on outburst stems from alterations in pore structure and adsorption–desorption capabilities. Simultaneously, it collectively heightened the outburst risk by increasing the gas pressure gradient and weakening the strength of the coal.

_{8矿F 15} -22080工作面运输巷道处于特殊的非均匀应力区。在该地区，抽采钻孔钻探过程经常引发煤与瓦斯突出。在此背景下，本研究对不同应力区采集的煤样系统地进行了高压气体吸附实验和高压气体解吸实验，获得了其吸附/解吸特性。随后，通过采用扫描电子显微镜、低压N ₂吸附和低压CO ₂吸附技术以及分形分析来研究不同尺度的煤孔隙结构特征，以评估不同应力水平的影响。在此基础上，综合分析探讨应力、孔隙结构、吸附/解吸特征与突出风险之间的联系。结果表明，随着应力的增加，Protodyakonov系数f和Langmuir压力P _L减小，而煤瓦斯扩散初速度Δ p和Langmuir体积V _L增大。气体的解吸量和解吸率也显着增加。微孔的总孔容和比表面积增加，介孔和大孔的总孔容和比表面积总体呈下降趋势。表面分形维数D _F1增加9%，空间分形维数D _F2减少5.2%，体积分形维数D _SIE增加1%。诱导应力导致大孔和中孔丰度减少，同时微孔增加。 V _L随D _SIE线性增加，而P _L随D SIE 线性减少。初始解吸速率随着D _F2的减少和D _SIE的增加而增加。叠加应力对突出的影响源于孔隙结构和吸附-解吸能力的改变。同时，瓦斯压力梯度增大、煤体强度减弱，共同加大了突出风险。