Crack analysis of the foundation gallery within an asphalt concrete core dam based on 3D SBFEM-PFM

作者：Yue Zhuo, Kai Chen, Degao Zou, Shanlin Tian, Shiyong Wu, Shi Zhang · 发表于：Engineering Analysis with Boundary Elements · 年份：2026 · DOI：10.1016/j.enganabound.2026.106641 · 被引用次数：11 · 研究领域：Numerical methods in engineering、Fluid Dynamics Simulations and Interactions、Dam Engineering and Safety

Fracture analysis of anti-seepage systems in earth-rock dams involves pronounced material nonlinearity, frictional contact behavior, and convergence difficulties, which remain long-standing challenges in geotechnical engineering. In this study, A nonlinear 3D SBFEM–PFM formulation was created by embedding the phase-field model (PFM) into the scaled boundary finite element method (SBFEM) and implementing an intra-element phase-field interpolation scheme. Base on independently developed GEODYNA, a unified and parallelized framework was established through various coupling schemes, including FEM-SBFEM, phase-field, and nonlinear contact algorithm. The method is validated against a classical benchmark and subsequently applied to the world’s highest asphalt concrete core rockfill dam (ACCRD) on the overburden to simulate full-process cracking of gallery. Cracks were identified along the inner surface of the gallery and on the outer surfaces of both banks, with reservoir impoundment exhibiting opposing effects on crack width. Additionally, the severity of structural damage was significantly influenced by the interface characteristics between the gallery and surrounding geomaterial. This study signifies the inaugural implementation of PFM to achieve a full-process simulation of stress accumulation, crack initiation, and progressive propagation within dam anti-seepage systems. High risk zones were precisely identified, and the practical optimization measure was suggested, providing a...