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首页> 外文期刊>International journal of geotechnical engineering >Undrained and drained shearing behavior of kaolinite with different microfabrics
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Undrained and drained shearing behavior of kaolinite with different microfabrics

机译：不同微结构的高岭土的不排水和排水剪切行为

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摘要

Clay deposits often exhibit inherent anisotropy due to different microfabrics, resulting from both environmental conditions during deposition and stress conditions subsequently. Many anisotropic elastic-plastic models are developed for modeling the behavior of clays subjected to anisotropic stress conditions. In this study, the drained and undrained shearing behavior of kaolinite clay samples with different microfabrics are modeled using anisotropic S-CLAY1 model with a rotational hardening rule and the isotropic modified cam clay (MCC) model. The inherent anisotropy resulting from the difference in the microfabric of the clay samples, reflected as the initial value of the rotational hardening parameter of the S-CLAY1 model, is determined based on the shape of the undrained stress paths of the samples subjected to consolidated undrained triaxial tests. The simulated results are compared with the results of consolidated undrained and drained triaxial tests carried out on kaolinite samples with different microfabrics. Clay samples with different microfabrics are prepared artificially, in the laboratory, by remolding with different pore fluids. It is observed that while S-CLAY1 model predicts the undrained behavior of kaolinite samples better, the drained behavior is better predicted by the MCC model.
机译：粘土沉积物经常由于不同的微织物而表现出固有的各向异性，这是由沉积过程中的环境条件和随后的应力条件共同导致的。开发了许多各向异性的弹塑性模型来模拟粘土在各向异性应力条件下的行为。在这项研究中，使用具有旋转硬化规则的各向异性S-CLAY1模型和各向同性改性凸轮粘土（MCC）模型对具有不同微结构的高岭石粘土样品的排水和不排水剪切行为进行建模。由粘土样品的微结构差异引起的固有各向异性反映为S-CLAY1模型的旋转硬化参数的初始值，它是根据经受固结不排水的样品的不排水应力路径的形状确定的三轴测试。将模拟结果与对具有不同微织物的高岭土样品进行的不排水和排水三轴固结试验的结果进行了比较。在实验室中，通过用不同的孔隙流体重塑，可以人工制备具有不同微织物的粘土样品。可以观察到，尽管S-CLAY1模型可以更好地预测高岭石样品的不排水行为，但MCC模型可以更好地预测排水行为。

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