Improvement to the intergranular strain model for larger numbers of repetitive cycles
Improvement to the intergranular strain model for larger numbers of repetitive cycles
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DOI：
10.1007/s11440-020-01073-w
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发表时间：
2020-09-25
期刊：
影响因子：
5.7
通讯作者：
Fuentes, W.
中科院分区：
文献类型：
--
作者：
Duque, J.;Masin, D.;Fuentes, W.
循环荷载作用下饱和土岩土工程问题的分析需要使用先进的本构模型。这些模型需要描述材料在循环加载和不排水条件下的主要特征，如孔隙水压力积累速率和应力吸引子。当正确地这样做时，预计模型在边值问题中的使用是可靠的。在这项工作中，提出了Niemunis和Herle （Mech Cohes frictic Mater 2(4):279-299, 1997）广泛实施的晶间应变模型的扩展。修改的目的是提高模型在模拟许多重复循环时的能力，其中期望适当减少应变积累。为了验证，将参考模型和提出的改进方法与一些单调和循环三轴试验进行了比较。结果表明，晶间应变改进模型在不破坏原模型的优点的情况下，能更真实地预测循环加载下的累积速率。
The analysis of geotechnical problems involving saturated soils under cyclic loading requires the use of advanced constitutive models. These models need to describe the main characteristics of the material under cyclic loading and undrained conditions, such as the rate of the pore water pressure accumulation and the stress attractors. When properly doing so, the models are expected to be reliable for their use in boundary value problems. In this work, an extension of the widely implemented intergranular strain model by Niemunis and Herle (Mech Cohes Frict Mater 2(4):279-299, 1997) is proposed. The modification is aimed to improve the capabilities of the model when simulating a number of repetitive cycles, where a proper reduction of the strain accumulation is expected. For validation purposes, the reference model and proposed improvement are compared against some monotonic and cyclic triaxial tests. The results indicate that the intergranular strain improvement model provides a more realistic prediction of the accumulation rates under cyclic loading, without spoiling the advantages of the original formulation.