In order to investigate the influence of granulometric and material composition on rheology, in this study an improved direct shear creep apparatus is used to conduct shear rheological tests on sandy soil samples of different granulometric compositions and water contents. Creep curves for different shear load levels, as are the average viscosity coefficients of soils based on the experimental data and curves relating the creep stress threshold/ average viscosity coefficient and organic matter content. Analysis of the experimental data reveals that the rheology of sandy soil was most strongly influenced by particle size, water content, and the level of shear stress; organic matter content was the primary material factor affecting the rheological properties of soft soil; with increase in organic matter content, the deformation of soft soil was obviously increased, while the creep stress threshold significantly decreased. This experimental study offers insights into the microscopic mechanisms behind soil rheology and has significance for the calculation and engineering design of the time-dependent deformation of the foundation.

为了研究粒度和材料组成对流变学的影响，本研究中使用了一种改进的直接剪切蠕变仪对不同粒度和含水量的砂土样品进行剪切流变学测试。基于实验数据的土壤平均黏度系数以及不同蠕变应力阈值/平均黏度系数和有机质含量的曲线，适用于不同剪切载荷水平的蠕变曲线。对实验数据的分析表明，沙质土壤的流变性受粒径，含水量和剪切应力水平的影响最大。有机质含量是影响软土流变性的主要物质因素。随着有机物含量的增加，软土变形明显增加，蠕变应力阈值明显降低。这项实验研究提供了对土壤流变学背后的微观机制的深刻见解，对于地基随时间变化的变形的计算和工程设计具有重要意义。