矿井火灾通风系统紊乱及其灾情演变特征是当前矿井火灾研究的热点问题。 通过实验得 到不同通风能力时上行风流火灾主干风路和旁侧支路温度与风量变化规律。 运用矿井物理通风仿 真 TF1M3D 软件，结合算例矿井，详细描述全域矿井的上行通风火灾变化及通风系统紊乱过程。 研 究表明，在矿井系统中，火灾燃烧作为非控制性能量释放热动力源，其火风压与矿井通风动力相互 作用，导致矿井风流紊乱。 随着火势不断增强，上行风流火灾可以导致旁侧支路风量的降低、停滞 和逆转变化，在复杂风网中引发烟流沿某一回路形成大流循环，扩大灾害，影响救灾。 提高通风机 能力，可以降低旁侧支路的通风热阻力增量，避免旁侧支路发生风流逆转，TF1M3D 仿真结果表明，当算例矿井风机转数从 540 r / min 提高到 740 r / min 时，克服了上行风流火灾引起旁侧支路 402 工 作面的烟流逆转。 从变化规律上，理论结果与实验结果相印证。

That disordered characteristics and its disaster evolution characteristics of mine ventilation system caused by as⁃censional airflow fire is a focus of mine fire research. Through repeated experiments，the variation laws of tem⁃ perature and air volume in main and side branches of ventilation system with different ventilation capacity due to as⁃ censional airflow fire are obtained. Using the TF1M(3D)，a catastrophic ventilation simulation software，to solve the problems of mine physical ventilation，combined with the analysis on the example，the variation of ascensional airflow fire and the process of disordered ventilation system in the whole mine are described in detail. It is shown that in the mine ventilation system，the combustion plays a role of the power source of non⁃controlled energy release，and its fire pressure interacts with the thermal resistance of mine ventilation，which directly causes the airflow disorder of the mine ventilation system. As the fire intensifies， the ascensional airflow fire can cause the airflow in side branch to decrease，stagnate or even reverse，which may lead to the expansion of the disaster and seriously affect the speed of disaster relief. Improving the fan supply capacity can not only reduce the ventilation thermal resistance in⁃ crement of the side branch，but also avoid the airflow reversal of the side branch at the same time. The simulation re⁃ sultsusing the software TF1M3D demonstrate that when the speed of mine fan increases from 540 r/min to 740 r / min，the reversal of smoke flow in the side branch ( the 402 working face) caused by ascensional airflow fire is overcome. In terms of variation law，the theoretical results and the experimental results are mutually verified.