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A boundary adaptive optimization-based meshfree large deformation method for asphalt concrete/earth core wall rockfill dams on deep overburdens
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PRE
AI
J
邹
B
张
J
DOI：10.1016/j.compgeo.2026.108486.png)
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Abstract
En 中文
A core wall rockfill dam is an important dam type on the deep overburden foundation, and its upper core wall is directly connected to the cutoff wall, which may cause the local large deformation due to the significant difference of stiffness. Thus, capturing the deformation mode of soil and the stress distribution of the anti-seepage structure at the joint area between the core wall and the cutoff wall is highly important. In this paper, a boundary adaptive optimization-based meshfree large deformation method (MFLDM) is developed, which implements adaptive truncation optimization of background meshes near model boundaries and enables more reasonable numerical integration. A typical numerical example is presented to verify the precision improvement achieved by the proposed method. Then the proposed method is applied to a typical asphalt concrete core wall rockfill dam and an earth core wall rockfill dam on deep overburden, and a global finite element method (FEM)-local meshfree method (MFM) model is established. The results indicate that local large deformation phenomena occur at the joint area between the core wall and the cutoff wall during the construction stages of both dams, and gradually develop into obvious shear bands with lengths of up to 13.2 m and 8.1 m, respectively. Finally, this study quantifies the relative deviations of the vertical stresses for the cutoff wall after the dam construction process between the small deformation analysis and the local large deformation analysis.
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