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不同界面过渡区（ITZ）和集料特性的堆石混凝土单轴压缩行为的三维细观数值研究

3D mesoscopic numerical investigation on the uniaxial compressive behavior of rock-filled concrete with different ITZ and aggregate properties.

作者信息

Chen Peng, Li Youbin, Tang Xiaoling, Liu Ning

机构信息

College of Civil Engineering, Guizhou University, GuiYang, 550025, China.

出版信息

Sci Rep. 2025 Aug 5;15(1):28588. doi: 10.1038/s41598-025-13668-y.

DOI:10.1038/s41598-025-13668-y
PMID:40764641
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12325926/
Abstract

Rockfill concrete (RFC) is constructed by initially placing large rocks and then filling the inter-rock voids with high-flow Self-Compacting Concrete (SCC) to ultimately form a complete concrete structure. The use of large-size rocks makes the structure of the interface transition zones and rocks interactions within RFC different from those of conventional concrete. The effect of the new internal structure on the overall mechanical performance of RFC is unclear. Moreover, the size of specimens for physical testing of RFC is much larger than that of conventional concrete, which hinders the test. This paper mainly utilizes numerical methods to carry out the related research. A three-dimensional mesoscopic finite element model (FEM) containing the rock, SCC, ITZ, and aggregate contact unit(ACU) between the rocks is established and validated combined with the experiments. After that, numerical modeling was used to investigate the effects of single changes in ITZ properties, aggregate properties and internal defects of aggregates on the uniaxial compressive properties of RFC. The results demonstrate that RFC's uniaxial compressive performance increases with enhanced ITZ mechanical properties, although the role of ITZ in RFC differs from that in conventional concrete. RFC's uniaxial compressive performance also improves with increasing aggregate mechanical properties, showing a strong linear correlation. The influence of aggregate properties on RFC is more significant than that of ITZ, highlighting RFC's greater dependence on aggregate characteristics. Internal defects within the aggregate weaken its performance, thereby reducing RFC's uniaxial compressive strength. As porosity increases, the degradation in RFC performance becomes more pronounced.

摘要

堆石混凝土（RFC）是通过先放置大石块，然后用高流动性自密实混凝土（SCC）填充石块间的空隙，最终形成完整的混凝土结构来建造的。大尺寸石块的使用使得堆石混凝土中界面过渡区的结构以及石块之间的相互作用与传统混凝土不同。这种新的内部结构对堆石混凝土整体力学性能的影响尚不清楚。此外，用于堆石混凝土物理测试的试件尺寸比传统混凝土大得多，这给测试带来了阻碍。本文主要利用数值方法进行相关研究。建立了一个包含岩石、自密实混凝土、界面过渡区（ITZ）以及岩石之间的骨料接触单元（ACU）的三维细观有限元模型（FEM），并结合实验进行了验证。在此之后，利用数值模拟研究了界面过渡区性能、骨料性能以及骨料内部缺陷的单一变化对堆石混凝土单轴压缩性能的影响。结果表明，尽管界面过渡区在堆石混凝土中的作用与在传统混凝土中不同，但随着界面过渡区力学性能的增强，堆石混凝土的单轴压缩性能会提高。堆石混凝土的单轴压缩性能也随着骨料力学性能的提高而改善，呈现出很强的线性相关性。骨料性能对堆石混凝土的影响比界面过渡区更显著，突出了堆石混凝土对骨料特性的更大依赖性。骨料内部的缺陷会削弱其性能，从而降低堆石混凝土的单轴抗压强度。随着孔隙率的增加，堆石混凝土性能的退化变得更加明显。

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