The seepage effect of rock and soil in the process of encountering water follows a nonlinear coupling law between water and rock. According to the permeability of rock and soil during softening with water, changes in particles in rock and soil are related to permeability mechanisms. Based on the assumption of connection between particles in rock and soil, changes in particles before and after water infiltration, the mechanism of water–rock interaction, and the damage to rock and soil are analyzed herein. Combined with fractal theory and percolation theory, the random failure characteristics and nonlinear behavior of water in rock and soil are studied. At the same time, with the help of Fluent 17.0 software, the seepage process of rock samples in water is numerically simulated and analyzed. Taking the permeability coefficient of rock samples, the mass flow rate of water, and the internal pore water pressure of rock samples as tracking objects, it is found that there are obvious nonlinear characteristics in the process of water–rock interaction. The seepage–stress coupling between water and rock forms negative resistance to water seepage. The water infiltration is a slow and then accelerated process and tends to be stable. Research has shown that the coupling effect of seepage between water and rock increases the damage inside the rock and soil, and its permeability fluctuates randomly at different time steps. This feature is a common manifestation of fractal properties and percolation within rock and soil particles. At the same time, there is a non-equilibrium variation law of pore water pressure inside the rock and soil. This leads to a continuous strengthening of the seepage effect, reaching a stable state. The results of this study are crucial. It not only reveals the mechanism of interaction between water and rock but also correlates the degree of internal damage in rock and soil based on the seepage characteristics between water and rock. The conclusions can provide some reference value for relevant construction methods in the analysis of the formation of water flow characteristics, the prevention of rock slope seepage disasters, and the control of water inrush in tunnel excavation.

中文翻译：

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岩土与水相互作用的渗透效应及非线性耦合特征

岩土体遇水过程中的渗流作用遵循水岩非线性耦合规律。根据岩土在水软化过程中的渗透性，岩土中颗粒的变化与渗透机制有关。基于岩土颗粒之间存在联系的假设，分析了水入渗前后颗粒的变化、水岩相互作用的机理以及对岩土的破坏。结合分形理论和渗流理论，研究岩土中水的随机破坏特征和非线性行为。同时，借助Fluent 17.0软件，对岩石样品在水中的渗流过程进行数值模拟和分析。以岩样渗透系数、水的质量流量、岩样内部孔隙水压力为跟踪对象，发现水岩相互作用过程中存在明显的非线性特征。水与岩石之间的渗流-应力耦合对渗流形成负阻力。水的入渗是一个缓慢而后加速的过程，并趋于稳定。研究表明，水与岩石渗流的耦合作用增加了岩土内部的损伤，其渗透率在不同时间步长随机波动。这一特征是岩石和土壤颗粒内分形特性和渗透的常见表现。同时，岩土内部孔隙水压力存在非平衡变化规律。这导致渗流效应不断加强，达到稳定状态。这项研究的结果至关重要。它不仅揭示了水与岩石之间的相互作用机制，而且根据水与岩石之间的渗流特性，关联了岩土内部损伤程度。研究结论可为相关施工方法在隧道开挖水流形成特征分析、岩质边坡渗流灾害防治、突水控制等方面提供一定的参考价值。