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Soil behavior under low- and high-cycle loading—Element tests vs. constitutive models
Geomechanics for Energy and the Environment ( IF 3.3 ) Pub Date : 2020-04-18 , DOI: 10.1016/j.gete.2020.100188
T. Wichtmann

The first part of the paper deals with high-cycle loading and presents a parametric study with numerous drained cyclic tests with a large number of cycles (N104). The dependence of the strain accumulation rate on initial relative density, amplitude, average stress and cyclic preloading is addressed. These test series form the basis of the calibration of a high-cycle accumulation (HCA) model, which is briefly explained. Furthermore, the influences of the grain size distribution curve, particle shape and the sample preparation method on the cumulative strains are discussed. In further test series the effects of multiple changes of the direction of the cycles, of frequently changing amplitudes, and of changes of the average stress between bundles of cycles were investigated. The second part of the paper is dedicated to low-cycle loading. A data base with a large number of undrained cyclic triaxial tests performed on a fine sand is presented. The test conditions comprise stress or strain-controlled cycles, performed from isotropic or anisotropic initial stresses and involving different densities and amplitudes. The predictions of three sophisticated constitutive models for sand, namely hypoplasticity with intergranular strain, ISA and Sanisand, are tested against the experimental data. Finally, a second data base concerning a large number of cyclic tests on kaolin is briefly introduced.



中文翻译:

低周和高周荷载下的土壤行为-单元试验与本构模型

本文的第一部分讨论了高循环负荷,并提出了参数研究,其中包括大量循环的大量排水循环试验(ñ1个04)。解决了应变累积速率对初始相对密度,振幅,平均应力和循环预载的依赖性。这些测试系列构成了高循环累积(HCA)模型校准的基础,对此进行了简要说明。此外,讨论了粒度分布曲线,颗粒形状和样品制备方法对累积应变的影响。在进一步的测试系列中,研究了循环方向多次变化,振幅频繁变化以及循环束之间平均应力变化的影响。本文的第二部分专门针对低周期加载。提出了在细砂上进行大量不排水循环三轴试验的数据库。测试条件包括应力或应变控制的循环,由各向同性或各向异性的初始应力执行,并涉及不同的密度和幅度。相对于实验数据,测试了三种复杂的砂土本构模型的预测,即具有晶间应变的低塑性,ISA和Sanisand。最后,简要介绍了有关大量高岭土循环测试的第二个数据库。

更新日期:2020-04-18
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