The seepage of the fractured rock mass in dam foundations involves complex fluid-structure coupling behavior, due to practical hydrogeological conditions. In this work, the seepage characteristics of the fractured rock mass and their correlations with the structural permeable mediums are experimentally explored to reveal the cracking effect on the hydromechanical properties firstly. Subsequently, the tangential and the compression creep damage constitutive models are, respectively, established by introducing a nonlinear viscoplastic body to improve the Nishihara model. Afterwards, an innovative evolution equation of the permeability coefficient considering the creep damage is proposed. It can indicate the time effect of the porosity, the permeability, and damage variables of the fractured rock mass under the long-term infiltration action of the hydraulic pressures. Ultimately, the proposed methods are applied to the seepage simulation on the dam foundation of the Longyangxia hydropower station and the significantly increased leakage is in good agreement with the measured values during the storage period. It was further confirmed that the crack expansion and penetration in the rock masses can be constantly intensified by the seepage pressures. The research results can provide a reference for engineering repair and supervision through controlling the permeability performance for long-term operations.

中文翻译：

---

坝基高渗压力下裂隙岩体的渗流演化模型

由于实际的水文地质条件，坝基中裂隙岩体的渗流涉及复杂的流固耦合行为。在这项工作中，对裂隙岩体的渗透特性及其与结构渗透介质的关系进行了实验研究，以首先揭示裂缝对流体力学特性的影响。随后，通过引入非线性粘塑性体来改进Nishihara模型，分别建立了切向和压缩蠕变损伤本构模型。然后，提出了考虑蠕变损伤的渗透系数的创新演化方程。它可以指示孔隙率，渗透率，水力长期渗透作用下裂隙岩体的破坏及损伤变量 最终，所提出的方法被应用于龙羊峡水电站坝基的渗流模拟，并且泄漏量的显着增加与存储期间的测量值非常吻合。进一步证实，渗透压力可以不断加剧岩体中的裂纹扩展和渗透。该研究结果可通过控制长期运行的渗透性能为工程修复和监督提供参考。所提方法在龙羊峡水电站坝基渗流模拟中得到了应用，其显着增加的渗漏量与储水期的实测值吻合良好。进一步证实，渗透压力可以不断加剧岩体中的裂纹扩展和渗透。该研究结果可通过控制长期运行的渗透性能为工程修复和监督提供参考。所提方法在龙羊峡水电站坝基渗流模拟中得到了应用，其显着增加的渗漏量与储水期的实测值吻合良好。进一步证实，渗透压力可以不断加剧岩体中的裂纹扩展和渗透。该研究结果可通过控制长期运行的渗透性能为工程修复和监督提供参考。