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Unsaturated shear strength of soil with bimodal soil-water characteristic curve

机译：具有双峰土壤 - 水特征曲线土壤的不饱和剪切强度

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摘要

Many research works have been carried out to develop equations for shear strength of unsaturated soil. However, most of the equations are limited to soils with unimodal soil-water characteristic curves (SWCC). The objective of this study is to propose an equation for estimating the unsaturated shear strength of soils with bimodal SWCCs. Several series of unsaturated consolidated drained triaxial tests were carried out on statically compacted sand-kaolin specimens to evaluate the proposed equation. The experimental results indicated that the phi(b) angle of the soil with bimodal SWCC at suctions between the first air-entry value (AEV1) and the second air-entry value (AEV2) was less than the phi(b) angle at suctions below AEV1. However, the relationships between shear strength and suction at suctions between AEV1 and AEV2 were still linear. At suctions beyond AEV2, the phi(b) angle of the soil with bimodal SWCC started to decrease non-linearly. The evaluation results showed that the estimated bimodal shear strength using the proposed equation in this study had good agreement with the shear strength data from the experimental works.
机译：已经进行了许多研究工作，以开发不饱和土的剪切强度方程。然而，大多数等式限于具有单峰土壤 - 水特征曲线（SWCC）的土壤。本研究的目的是提出一种估算具有双峰SWCC的未饱和剪切强度的等式。在静态压实的砂高岭土试样上进行了几系列不饱和固结排出的三轴试验，以评估所提出的方程。实验结果表明，在第一空气入口值（AEV1）和第二空气入口值（AEV2）之间的混合中具有双模SWCC的土壤的PHI（B）角度小于Sunction的PHI（B）角度在AEV1下面。然而，AEV1和AEV2之间的剪切强度和吸入之间的关系仍然是线性的。在超出AEV2之外的吸附中，用双模SWCC的土壤的PHI（B）角度开始非线性地降低。评估结果表明，使用本研究中所提出的方程的估计双峰剪切强度与实验工程的剪切强度数据吻合良好。

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