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Predicting resilient modulus of fine-grained subgrade soils considering relative compaction and matric suction

机译：考虑相对压实和测距的细粒细化土壤的弹性模量

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The resilient modulus has been used to characterise the stress-strain non-linear behaviour of subgrade soils and is an important parameter for pavement design and analysis. This study aims at developing an accurate and efficient methodology to estimate the resilient modulus of subgrade soils. Therefore, repeated load triaxial tests were carried out in this study. The soil matric suction was measured by the pressure plate test and the soil-water characteristic curve (SWCC) was described using the Fredlund & Xing model. Then, the influence of stress state, matric suction and relative compaction on the resilient modulus were analysed. Subsequently, a new resilient modulus model was proposed to incorporate the relative compaction and matric suction in addition to the stress state. The new model matched 7 sets of experimental data well and the coefficients of determination were high, which indicates that this new model is reasonable and widely applicable. Finally, the correlations between the basic properties variables of soil samples and the regression coefficients of the new model were established.
机译：弹性模量已经用于表征路基土壤的应力 - 应变非线性行为，是路面设计和分析的重要参数。本研究旨在制定准确和有效的方法，以估算落后土壤的弹性模量。因此，在本研究中进行了重复的载荷三轴试验。通过压力板试验测量土壤原料抽吸，并使用Fredlund＆xing模型描述了土壤 - 水特性曲线（SWCC）。然后，分析了应力状态，测力和相对压实对弹性模量的影响。随后，提出了一种新的弹性模量模型，除了应力状态之外还包含相对压实和测距。新型型号匹配7套实验数据良好，测定系数很高，这表明这一新模型是合理和广泛适用的。最后，建立了土壤样本的基本特性变量与新模型的回归系数之间的相关性。

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