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<p>The soil-structure interfacial mechanical properties are crucial for the design and bearing capacity evaluation of offshore foundations. The major objective of this study was to investigate the long-term evolution of soil-structure interfacial shearing behavior by employing a well-designed interfacial frictional apparatus. Additionally, the underlying mechanism was revealed from the perspective of microstructure by the SEM microscopic method. The results indicate that the strength recovery of soil due to consolidation over time can significantly promote the soil-structure interfacial strength. With the increase in the structure roughness, the shear failure plane gradually transforms from the soil-structure interface to the soil layer. The ratio of interfacial strength and soil strength increases with the increase in the relative roughness, and the critical relative roughness value could change over time. The microstructural evolution of soil over time is characterized by the transformation from a dispersed structure with individual particles to a well flocculated structure, which could enhance the soil strength and interfacial strength. The frequency of small particles or aggregates/flocculations finer than 1&#xa0;μm decreased notably, while the frequencies of larger particles or aggregates (5–10 and &gt; 10&#xa0;μm) increased with curing time. The position of shear failure plane for structure with higher roughness gradually moving outwards the structure surface over time might be attributed to the increase in the number of soil aggregates or flocculations. The research results are significant which could provide essential guidance for practical foundation design, as well as bring a deeper insight into understanding the mechanism of soil-structure interfacial shearing behavior.</p>

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Long-Term Soil-Structure Interface Behavior and Microstructural Insights from SEM Analysis

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Zheng Zheng,
  • Yu Zhang,
  • Junqing Wang,
  • Xinqi Lou,
  • Xianwei Zhang,
  • Yubin Ren

摘要

The soil-structure interfacial mechanical properties are crucial for the design and bearing capacity evaluation of offshore foundations. The major objective of this study was to investigate the long-term evolution of soil-structure interfacial shearing behavior by employing a well-designed interfacial frictional apparatus. Additionally, the underlying mechanism was revealed from the perspective of microstructure by the SEM microscopic method. The results indicate that the strength recovery of soil due to consolidation over time can significantly promote the soil-structure interfacial strength. With the increase in the structure roughness, the shear failure plane gradually transforms from the soil-structure interface to the soil layer. The ratio of interfacial strength and soil strength increases with the increase in the relative roughness, and the critical relative roughness value could change over time. The microstructural evolution of soil over time is characterized by the transformation from a dispersed structure with individual particles to a well flocculated structure, which could enhance the soil strength and interfacial strength. The frequency of small particles or aggregates/flocculations finer than 1 μm decreased notably, while the frequencies of larger particles or aggregates (5–10 and > 10 μm) increased with curing time. The position of shear failure plane for structure with higher roughness gradually moving outwards the structure surface over time might be attributed to the increase in the number of soil aggregates or flocculations. The research results are significant which could provide essential guidance for practical foundation design, as well as bring a deeper insight into understanding the mechanism of soil-structure interfacial shearing behavior.