An experimental database for the development, calibration and verification of constitutive models for sand with focus to cyclic loading: part I—tests with monotonic loading and stress cycles
An experimental database for the development, calibration and verification of constitutive models for sand with focus to cyclic loading: part I—tests with monotonic loading and stress cycles
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DOI：
10.1007/s11440-015-0402-z
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发表时间：
2016-08
期刊：
影响因子：
5.7
通讯作者：
T. Wichtmann;T. Triantafyllidis
中科院分区：
文献类型：
--
作者：
T. Wichtmann;T. Triantafyllidis
对于地震荷载作用下的岩土结构的数值研究，旨在检查可能的破坏，由于液化，使用一个复杂的本构模型的土壤是必不可少的。这种模型必须充分描述材料在恒定体积（不排水）条件下对循环荷载的响应，其中包括有效应力的松弛（孔隙压力累积）或有效应力环在足够多的循环次数（循环流动性、应力吸引子）后重复通过。不排水循环荷载下的土壤特性是多种多样的，取决于初始条件（例如密度、组构、有效平均压力、应力比）和荷载特性（例如循环幅度、应力或应变循环的应用）。为了开发、校准和验证本构模型，重点是不排水循环荷载，高质量的实验室试验数据，包括各种初始条件和荷载特性是必要的。这两篇配套论文的目的就是为这类数据库收集提供一个细沙。该数据库包括许多不排水循环三轴试验与应力或应变循环施加到各向同性或各向异性固结的样品。还进行了排水或不排水条件下的单调三轴试验。此外，排水三轴，oedometric或各向同性压缩试验与几个卸载和再加载循环。第一部分集中在单调加载或应力循环三轴试验。本文提供的所有测试数据可从第一作者的主页获得。作为一个例子，现有的本构模型的检查，实验数据进行比较，使用亚塑性与晶间应变的元素测试模拟。
For numerical studies of geotechnical structures under earthquake loading, aiming to examine a possible failure due to liquefaction, using a sophisticated constitutive model for the soil is indispensable. Such a model must adequately describe the material response to a cyclic loading under constant volume (undrained) conditions, amongst others the relaxation of effective stress (pore pressure accumulation) or the effective stress loops repeatedly passed through after a sufficiently large number of cycles (cyclic mobility, stress attractors). The soil behaviour under undrained cyclic loading is manifold, depending on the initial conditions (e.g. density, fabric, effective mean pressure, stress ratio) and the load characteristics (e.g. amplitude of the cycles, application of stress or strain cycles). In order to develop, calibrate and verify a constitutive model with focus to undrained cyclic loading, the data from high-quality laboratory tests comprising a variety of initial conditions and load characteristics are necessary. The purpose of these two companion papers was to provide such database collected for a fine sand. The database consists of numerous undrained cyclic triaxial tests with stress or strain cycles applied to samples consolidated isotropically or anisotropically. Monotonic triaxial tests with drained or undrained conditions have also been performed. Furthermore, drained triaxial, oedometric or isotropic compression tests with several un- and reloading cycles are presented. Part I concentrates on the triaxial tests with monotonic loading or stress cycles. All test data presented herein will be available from the homepage of the first author. As an example of the examination of an existing constitutive model, the experimental data are compared to element test simulations using hypoplasticity with intergranular strain.