Cracks have a major influence on the service life of brittle porous materials like concrete. Especially, the hydraulic properties within the cracked area are significantly changed compared to the uncracked material.

Former research often focused exclusively on the prediction of the initiation and growth of cracks or on the moisture transport, while the coupling between the moisture transport and the structural deterioration is rather an emerging topic. Usually, pore pressure in the crack is treated either acting within the whole cracked element or only at the element interface, while simultaneously the heterogeneity of the crack is neglected. To improve the hydraulic modelling of the a crack, a novel coupling approach is investigated in this work. The description is based on a multi-continuum moisture transport model, which is combined with a classical continuum mechanics solver using a smeared tensile crack mechanism. The model incorporates the changes in the pore and crack structure during crack development and is able to consider capillary and surface forces within the crack. The results of this model are in good agreement with measured saturation profiles during moisture ingress into cracked concrete from literature. Furthermore, the modelling of the Koyna dam demonstrates the applicability on large structures and is expected to improve the numerical description of aging processes.

裂纹对脆性多孔材料（如混凝土）的使用寿命有重大影响。尤其是，与未开裂的材料相比，开裂区域内的水力特性发生了显着变化。

以前的研究通常只专注于裂纹的萌生和扩展或湿气传输的预测，而湿气传输与结构恶化之间的耦合却是一个新兴话题。通常，对裂纹中的孔隙压力的处理要么作用于整个裂纹元素，要么仅作用于元素界面，而同时忽略了裂纹的异质性。为了改善裂缝的水力模型，在这项工作中研究了一种新颖的耦合方法。该说明基于多连续体水分传输模型，该模型与经典的连续体力学求解器结合使用了涂抹的拉伸裂纹机制。该模型结合了裂缝发展过程中孔隙和裂缝结构的变化，并能够考虑裂缝内的毛细作用和表面作用力。该模型的结果与文献中水分进入裂缝混凝土时测得的饱和度曲线非常吻合。此外，Koyna大坝的建模证明了其在大型结构上的适用性，并有望改善老化过程的数值描述。