Discrete element numerical analysis for bearing characteristics of coral sand foundation considering particle breakage
Discrete element numerical analysis for bearing characteristics of coral sand foundation considering particle breakage
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DOI：
10.1080/1064119x.2023.2233505
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发表时间：
2023-07
影响因子：
2.2
通讯作者：
Fenghui Hu;X. Fang;Chun-miao Shen;Z. Yao;Ganggang Zhou;Zhiqiang Wang
中科院分区：
文献类型：
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作者：
Fenghui Hu;X. Fang;Chun-miao Shen;Z. Yao;Ganggang Zhou;Zhiqiang Wang
由于岛礁工程建设的需要，研究珊瑚砂地基的承载变形特性具有重要意义。本文在珊瑚砂地基实际试验的基础上，采用离散单元法模拟珊瑚砂地基的平板载荷试验。采用块体置换法考虑了珊瑚砂的颗粒破碎，分析了相对密实度对珊瑚砂地基颗粒破碎特性和压缩变形特性的影响。结果表明，珊瑚砂地基的压缩过程经历了压实、剪切变形和破坏三个阶段。珊瑚砂地基的承载力、变形模量和颗粒破碎率均随相对密实度的增大而增大，但在不同相对密实度下，其增长趋势存在显著差异。数值分析表明，随着地基相对密实度的增大，接触力和配位数增大，相对位移减小，颗粒破碎程度增大。这一微观现象解释了地基承载力和变形模量随相对密实度的增大而减小的原因。
Abstract Owing to the construction demands of island and reef engineering, studying the bearing and deformation characteristics of coral sand foundations is significant. This study used the discrete element method to simulate the plate loading test of coral sand foundations based on the actual experiments of coral sand foundations. The particle breakage of coral sand was considered by the fragment replacement method, and the influence of relative compactness on the particle breakage behaviour and compression deformation characteristics of coral sand foundations was analysed. The results show that the compression process of the coral sand foundation undergoes three stages: compaction, shear deformation, and failure. The bearing capacity, deformation modulus, and particle breakage rate of the coral sand foundation increase with the increasing relative compactness, but the growth trends are different significantly at different relative compactness. The numerical analysis indicates when the relative compactness of the foundation increases, the contact force and coordination number would increase, the relative displacement would decrease, causing more particle breakage. This microscopic phenomenon explains why the increasing trend of bearing capacity and deformation modulus of the foundation decreases with the increasing relative compactness.