Abstract Groundwater inrush induced by collapse columns in crushed rock mass is a significant problem in deep mining operations. A change of fluid flow behavior is an important key to understanding inrush processes, especially regarding particle migration and mass loss. We conducted fluid-flow experiments on crushed mudstone to investigate the effects of mass loss on flow behavior in crushed rock. We consider initial porosity and Talbot power exponent as the two main influencing factors. The results indicate that particle migration leading to mass loss is the main reason for the flow change from non-Darcy seepage to turbulence, which then induces groundwater inrush. Upon an abrupt reduction of pore pressure, the inrushing water flow rapidly increases and the fluid flow change occurs with violent flushing. We apply the experimental results and statistics to discuss and assess groundwater inrush hazards using a proposed criterion related to the rate of mass loss (mp′). The groundwater inrush hazard of the studied samples is classified as low if mp′

中文翻译：

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破碎岩体中地下水突入的危害评估：质量损失引起的流体流动行为变化的实验研究

摘要 破碎岩体倒塌柱引起的地下水突涌是深部采矿作业中的一个重大问题。流体流动行为的变化是理解涌流过程的重要关键，尤其是在颗粒迁移和质量损失方面。我们对碎泥岩进行了流体流动实验，以研究质量损失对碎石流动行为的影响。我们认为初始孔隙度和 Talbot 幂指数是两个主要影响因素。结果表明，颗粒迁移导致质量损失是非达西渗流向湍流转变，进而诱发地下水突涌的主要原因。当孔隙压力突然降低时，突涌水流量迅速增加，流体流量发生变化，并伴随着猛烈的冲刷。我们使用与质量损失率 (mp') 相关的建议标准，应用实验结果和统计数据来讨论和评估地下水突入危害。如果 mp'，则研究样本的地下水突涌危险被归类为低