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<p>Dense silty sediments exhibit complex rheological behaviors due to their composition, which consists of sand, silt and clay. However, few studies have been conducted on the variation in the rheological properties of this material, especially for that with different particle size compositions. This paper investigated the rheological properties of ten silty samples with various kaolin contents. A set of experiments was conducted with a MCR302 rheometer by measuring the flow curves, deformation curves, and temporal responses of shear stress. The results indicate that dense silty sediments undergo a solid–liquid transition as the shear rate continuously increases. Due to the large bonding forces between fine particles, the samples with a smaller median particle diameter (<i>D</i><sub>50</sub>) have a higher critical shear stress during this transition. Smaller-diameter samples also commonly exhibit thixotropic behavior. The rheological behaviors are fit by both the Power-Law model and the Herschel–Bulkley model. The Herschel–Bulkley model was more suitable for samples with higher densities and smaller <i>D</i><sub>50</sub> values, while the Power-Law model is more suitable for describing samples with densities between 1229.70 and 1596.39&#xa0;kg/m<sup>3</sup> and <i>D</i><sub>50</sub> sizes between 72.90 and 26.90&#xa0;μm. The results of this paper are highly important for determining a rheological model for simulating sediment movement in silty estuaries and turbidity current in deep-sea areas.</p>

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Rheological experiments on dense silty sediments under steady shear loadings

  • 期刊论文

  • 发表日期：

    2025年1月21日

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  • Zhichao Wen,
  • Zhe Huang,
  • Haijue Xu,
  • Yuchuan Bai,
  • Jun Lu,
  • Junzheng Liu

摘要

Dense silty sediments exhibit complex rheological behaviors due to their composition, which consists of sand, silt and clay. However, few studies have been conducted on the variation in the rheological properties of this material, especially for that with different particle size compositions. This paper investigated the rheological properties of ten silty samples with various kaolin contents. A set of experiments was conducted with a MCR302 rheometer by measuring the flow curves, deformation curves, and temporal responses of shear stress. The results indicate that dense silty sediments undergo a solid–liquid transition as the shear rate continuously increases. Due to the large bonding forces between fine particles, the samples with a smaller median particle diameter (D50) have a higher critical shear stress during this transition. Smaller-diameter samples also commonly exhibit thixotropic behavior. The rheological behaviors are fit by both the Power-Law model and the Herschel–Bulkley model. The Herschel–Bulkley model was more suitable for samples with higher densities and smaller D50 values, while the Power-Law model is more suitable for describing samples with densities between 1229.70 and 1596.39 kg/m3 and D50 sizes between 72.90 and 26.90 μm. The results of this paper are highly important for determining a rheological model for simulating sediment movement in silty estuaries and turbidity current in deep-sea areas.