Suction Stress of Clay Over a Wide Range of Saturation
Suction Stress of Clay Over a Wide Range of Saturation
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DOI：
10.1007/s10706-019-01016-7
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发表时间：
2020-01-01
影响因子：
1.7
通讯作者：
Likos, William J.
中科院分区：
文献类型：
--
作者：
Akin, Idil Deniz;Likos, William J.
量化非饱和土的保水性和内应力状态之间的关系长期以来一直是一个挑战。目前的有效应力公式可以有效地捕捉粗粒土的关系，其中毛细管机制在较宽的饱和度范围内主导内应力状态，但对于细粒土则失败，特别是在低至中等饱和度下，其中表面吸附机制主导保水和相应的应力状态。通过巴西拉伸强度试验测量了饱和度 (S) 从 0 到 0.73 的压实高岭石样品的内应力状态。分析观察到的强度、应变和刚度的变化，以计算内应力随饱和度的演变。提出了一个模型来量化全范围饱和度下细粒和粗粒土壤的保水性和内应力之间的关系（0
Quantifying the relationship between water retention and internal stress state of unsaturated soils has long been a challenge. Current effective stress formulations can effectively capture the relationship for coarse-grained soils, where capillary mechanisms dominate internal stress state over a wide range of saturation, but fail for fine-grained soils, particularly at low to intermediate saturation, where surface adsorption mechanisms dominate water retention and corresponding stress state. Internal stress state of compacted kaolinite specimens spanning saturation (S) from 0 to 0.73 is measured through Brazilian tensile strength tests. Changes observed in strength, strain, and stiffness are analyzed to calculate evolution of internal stress with saturation. A model is proposed to quantify the relationship between water retention and internal stress for fine-grained and coarse-grained soils at saturations over the full range (0