A large number of statistics indicate that broken rock mass always transforms into a flowing channel and leads to water inrush disasters in mining engineering, such as fault, karst, and strongly weathered rock mass. During the process of water inrush, the structure of the broken rock mass is constantly changing due to seepage erosion under high-velocity flow. Therefore, it is of vital importance to quantitatively evaluate the flow behavior of the water inrush related to the seepage erosion in order to prevent or reduce the risks. This study described a coupled nonlinear flow model, which couples the high-velocity seepage, the small particle migration, and the evolution of the broken rock mass structure. The model was verified firstly for simulation of nonlinear flow behavior by comparing with the traditional one. Then, the proposed model was used to simulate the evolution of particle migration and seepage properties of the water inrush through broken rock mass by a numerical case. The simulation results generally agree well with the existing experimental results. The simulations indicate that small particle migration causes the unstable characteristics of the seepage and the heterogeneity properties of the broken rock mass, which lead to the nonlinear flow behavior of the water inrush in both time and space. From a different perspective, it also indicates that the proposed model is capable of simulating the interaction of high-velocity seepage, small particle migration, and evolution of broken rock mass structure in the process of water inrush.

中文翻译：

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破碎岩体突水颗粒迁移渗流耦合非线性流动模型

大量统计表明，破碎的岩体总是转变成流动的通道，导致采矿工程中的突水灾害，如断层、岩溶、强风化岩体等。在突水过程中，破碎岩体的结构在高速流动下由于渗流侵蚀而不断发生变化。因此，定量评价与渗流侵蚀相关的突水的流动行为对于预防或降低风险至关重要。本研究描述了耦合非线性流动模型，该模型将高速渗流、小颗粒迁移和破碎岩体结构的演化耦合起来。该模型首先通过与传统模型的对比验证，用于非线性流动行为的模拟。然后，提出的模型用于通过数值案例模拟颗粒迁移和突水通过破碎岩体的渗流特性的演变。模拟结果与已有的实验结果基本吻合。模拟结果表明，小颗粒运移导致破碎岩体的渗流特性不稳定，具有非均质性，从而导致突水在时间和空间上的非线性流动行为。从不同的角度也表明，该模型能够模拟突水过程中高速渗流、小颗粒运移和破碎岩体结构演化的相互作用。