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混凝土结构在服役过程中受到力学荷载和环境因素的影响会产生裂纹,裂纹的产生、扩展和连通会显著影响混凝土的渗透性。该文将混凝土看作由基体和裂纹夹杂二相组成的复合材料,采用单元嵌入技术,有效地解决了基于连续网格的实体裂纹模型存在的网格协调问题。考虑到弹性问题与渗流问题在数学上的相似性,通过对含裂纹混凝土位移场和应力场的弹性比拟,得到相应的渗流场。在计算过程中,分别研究了渗透系数、网格尺寸及裂纹张开度对渗流场的影响,以及该文方法对多裂纹体的适用性。计算结果表明:该文的方法与实体裂纹模型的渗流场计算结果吻合,保证了结果的正确性。同时也降低了三维裂纹建模的难度,提高了计算的效率。
Concrete structures subjected to mechanical loads and environmental factors during service will produce cracks. The generation, propagation and connection of concrete cracks will significantly affect the permeability of concrete. In this paper, concrete is regarded as a composite material composed of matrix and cracked inclusions. The cell embedding technique is adopted to effectively solve the mesh coordination problem of the solid crack model based on continuous meshes. Considering the mathematical similarity between the elastic problem and seepage problem, the corresponding seepage field is obtained by comparing the elastic and displacement of the cracked concrete with the displacement and stress fields. In the process of calculation, the effects of permeability coefficient, grid size and crack opening on the seepage field are studied respectively, and the applicability of the method to multi-crack bodies is studied. The calculation results show that the method in this paper is in good agreement with the calculated result of seepage field in solid crack model, which ensures the correctness of the result. It also reduces the difficulty of 3D crack modeling and improves the calculation efficiency.