Cave mining has inherent risks, which include rock bursts, collapses, subsidence, and inrushes. Among the inrush events that can occur are the inflows of water, mud, and dry-fine material. The latter type of inflow is one about which we have the least amount of information and little research, despite the fatal consequences that have occurred associated with this phenomenon. In this work, the inrush of fine events was simulated at a laboratory scale to study the main variables that influence these events. An experimental setup consisting of a drawbell filled with different layers of coarse and medium granular material was used as a base. A hang-up was induced in the setup and then fine material was added on top to observe the consequences. Three experimental stages were developed applying three distinct fine materials: glass microspheres, fragmented concrete, and finally clay. It was observed that the magnitude of the inrush event was directly related to lower friction and higher sphericity of the fine material. Finally, the inrush of fine events did not apparently occur due to shear failures in the experimental setup; rather in the simulated scenarios with the presence of coarse material, the removal of a hang-up was always required as a trigger mechanism to generate an inrush of fines event.

洞穴采矿具有固有的风险，包括岩爆、坍塌、下沉和涌流。可能发生的涌流事件包括水、泥浆和干粉材料的流入。后一种流入是我们掌握的信息最少且研究很少的一种，尽管与这种现象相关的致命后果已经发生。在这项工作中，在实验室规模上模拟了精细事件的涌入，以研究影响这些事件的主要变量。一个实验装置，由一个装有不同层粗粒和中粒的拉铃组成颗粒材料被用作基础。在设置中引起挂起，然后在顶部添加精细材料以观察结果。使用三种不同的精细材料开发了三个实验阶段：玻璃微球、碎混凝土，最后是粘土。据观察，涌流事件的大小与精细材料的较低摩擦和较高球形度直接相关。最后，由于实验装置中的剪切破坏，精细事件的涌入并没有明显发生；相反，在存在粗糙材料的模拟场景中，始终需要消除挂起作为触发机制来生成大量细粉事件。