Dynamic research methods were used to assess the stability of non-Darcian seepage and verify that parameter changes are an important cause of mine water inrush due to a karst collapse pillar (KCP). A KCP is an infiltration system that contains a large amount of partially cemented crushed coal and rocks, and can be very dangerous. We analysed the influence of parameter changes on the stability, the initial permeability, the equilibrium flow velocity, and the deviation factor β to study the non-Darcian seepage characteristics of this crushed coal media system. The permeability parameters of the internal structure of a KCP were used to characterize the evolution of a KCP water inrush accident. In the physical tests, the porosity of the framework was the factor that determined the seepage state of the porous medium and the initial permeability of the framework. For mines with a risk of KCP water inrush, the permeability parameters also have a safe range. Numerical calculations verified that the system’s equilibrium state was stable, and that it has two equilibrium flow rates v_s2 (3.5 × 10⁻⁴ m/s) and v_s3 (5.5 × 10⁻⁴ m/s); this interval will not cause a change in flow regime. Thus, the limiting value of the non-Darcian deviation factor β was defined given the experiment’s initial conditions: when it is less than − 1.5 × 10¹¹ kg/m⁴, the system is not in equilibrium, and the seepage system will lose stability.

使用动态研究方法评估非达西渗流的稳定性，并验证参数变化是岩溶坍塌柱（KCP）引起矿井突水的重要原因。KCP 是一种渗透系统，其中包含大量部分胶结的碎煤和岩石，可能非常危险。分析了参数变化对稳定性、初始渗透率、平衡流速和偏差因子β的影响研究这种碎煤介质系统的非达西渗流特性。KCP内部结构的渗透性参数被用来表征KCP突水事故的演变过程。在物理试验中，骨架孔隙率是决定多孔介质渗流状态和骨架初始渗透率的因素。对于存在KCP突水风险的矿山，渗透率参数也有一个安全范围。数值计算验证了系统的平衡状态是稳定的，并且它有两个平衡流速v _s2 (3.5 × 10 ^-4  m/s) 和v _s3 (5.5 × 10 ^-4 小姐）; 这个间隔不会引起流动状态的变化。因此，在给定实验初始条件的情况下，定义了非达西偏差因子β的极限值：当它小于 − 1.5 × 10 ¹¹  kg/m ^{4 时}，系统不处于平衡状态，渗流系统将失去稳定性.