Li Hao, He Jianxin, Liu Liang
Geotechnical Engineering, College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, China.
Xinjiang hydraulic engineering Geotechnical and structural engineering technology Research center, Urumqi, 830052, China.
Sci Rep. 2025 Jul 2;15(1):22890. doi: 10.1038/s41598-025-98761-y.
The stress distribution and deformation characteristics of asphalt concrete cores (ACC) under seismic loading exhibit regional variations, rendering uniform HAC mix proportions unsuitable for construction applications. Consequently, systematic optimization of core mix proportions during design stages is crucial to enhance deformation compatibility in asphalt concrete core dam (ACCD) structures. Mix proportion design should be performance-driven, with customized formulations developed in response to distinct deformation mechanisms observed across core wall zoning sections. In this paper, Niya Dam is taken as a case study, we adopt the engineering analogy method to summarize the stress-strain characteristics of core wall by comparing two similar projects. Subsequently, on the basis of analogy analysis, the core wall of Niya Dam is divided into three zones: large shear deformation zone, main active deformation zone, and strong seismic risk zone. In addition, the ability of core walls to adapt to large deformation is improved by optimizing mix proportions for different areas. Finally, three-dimensional finite element method is utilized to structural safety analysis. The results show that the settlement of the core wall is relatively small after the design earthquake, and the stress level is within the safe range, which demonstrate the feasibility and potentials of the proposed method.
地震作用下沥青混凝土心墙（ACC）的应力分布和变形特性呈现出区域差异，这使得统一的HAC混合料配合比不适用于工程应用。因此，在设计阶段对心墙混合料配合比进行系统优化，对于提高沥青混凝土心墙坝（ACCD）结构的变形协调性至关重要。混合料配合比设计应以性能为导向，针对心墙分区段观察到的不同变形机制制定定制配方。本文以尼雅大坝为例，通过比较两个相似工程，采用工程类比法总结心墙的应力应变特性。随后，在类比分析的基础上，将尼雅大坝的心墙分为三个区：大剪切变形区、主要活动变形区和强地震风险区。此外，通过优化不同区域的混合料配合比，提高心墙适应大变形的能力。最后，利用三维有限元法进行结构安全分析。结果表明，设计地震后心墙沉降较小，应力水平在安全范围内，验证了所提方法的可行性和潜力。
