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Strength and stiffness characterization of clays using Atterberg limits
Transportation Geotechnics ( IF 4.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.trgeo.2020.100420
Sayed M. Ahmed , Shehab S. Agaiby

Atterberg limits are index parameters that can be determined using simple, inexpensive, and rapid laboratory tests. These limits are commonly used for the classifications of fine-grained soils. They may be also utilized in the preliminary assessment of strength and stiffness parameters of these soils, particularly at the initial phases of geotechnical investigation programs, ahead of conducting more advanced tests on undisturbed samples. Numerous studies in the geotechnical literature have been directed towards enhancing the relationships between Atterberg limits and the different mechanical parameters of fine-grained soils. However, there is still a necessity to improve the accuracy and applicability of such correlations. In this study, the undrained rigidity index is correlated with the plasticity indices using a comprehensive worldwide clay database. Subsequently, the effective friction angle is determined using an expression of the rigidity index derived from the Critical State Soil Mechanics. New formulations are developed for the undrained shear strength under compression, extension, and simple direct shear modes, as well as expressions for the constrained, shear, and Young’s elastic moduli. The deduced formulations are validated using the results of the geotechnical investigations for well-reported sites. A close agreement is demonstrated between the measured and the estimated parameters, implying that the proposed approach is broadly valid and applicable.



中文翻译:

使用Atterberg极限表征粘土的强度和刚度

Atterberg极限是可以使用简单,廉价和快速的实验室测试确定的指标参数。这些限制通常用于细粒土壤的分类。它们还可以用于这些土壤的强度和刚度参数的初步评估,尤其是在岩土工程研究计划的初始阶段,然后再对未受干扰的样品进行更高级的测试。在岩土工程文献中,许多研究都致力于增强阿特贝格极限与细粒土的不同力学参数之间的关系。但是,仍然有必要提高这种相关性的准确性和适用性。在这个研究中,使用全面的全球粘土数据库,将不排水的刚度指数与可塑性指数相关联。随后,使用从临界状态土壤力学得出的刚度指数的表达式确定有效摩擦角。针对压缩,拉伸和简单直接剪切模式下的不排水剪切强度,以及约束,剪切和杨氏弹性模量的表达式,开发了新的公式。推论得出的公式使用报告良好的站点的岩土工程调查结果进行了验证。实测值和估计参数之间显示出密切的一致性,这表明所提出的方法是广泛有效和适用的。有效摩擦角使用从“临界状态土壤力学”得出的刚度指数表达式确定。针对压缩,拉伸和简单直接剪切模式下的不排水剪切强度,以及约束,剪切和杨氏弹性模量的表达式,开发了新的公式。推论得出的公式使用报告良好的地点的岩土工程调查结果进行了验证。实测值和估计参数之间显示出紧密的一致性,这表明所提出的方法是广泛有效和适用的。有效摩擦角使用从“临界状态土壤力学”得出的刚度指数表达式确定。针对压缩,延伸和简单直接剪切模式下的不排水剪切强度,以及受约束,剪切和杨氏弹性模量的表达式,开发了新的公式。推论得出的公式使用报告良好的站点的岩土工程调查结果进行了验证。实测值和估计参数之间显示出密切的一致性,这表明所提出的方法是广泛有效和适用的。推论得出的公式使用报告良好的站点的岩土工程调查结果进行了验证。实测值和估计参数之间显示出密切的一致性,这表明所提出的方法是广泛有效和适用的。推论得出的公式使用报告良好的地点的岩土工程调查结果进行了验证。结果表明,所测得的参数与估算的参数之间存在密切的一致性,这表明所提方法具有广泛的有效性和适用性。

更新日期:2020-09-01
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