单调和循环加载下粘土构成模型的预测能力:元素测试和离心机实验

Merita Tafili, Patrick Staubach, Jan Machaček, Hauke Zachert, Torsten Wichtmann
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引用次数: 0

摘要

通过分析复杂的实验室测试程序和对承受(循环)横向荷载的粘土单桩进行的离心试验,对粘土的三种构造模型进行了批判性研究。本文考虑了不同复杂程度的构成模型,即基本的修正卡姆粘土模型、具有晶间应变的低塑性模型(称为粘土低塑性模型)以及最近提出的各向异性粘-ISA 模型。通过对单调加载离心机试验的模拟,可以得出结论:如果能确保对构成模型参数进行适当的校准,并对状态变量进行适当的初始化,那么这三种构成模型都能给出令人满意的结果。在循环加载的情况下,AVISA 模型的性能优于具有晶间应变的低塑性模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Predictive abilities of constitutive models for clay under monotonic and cyclic loading: element tests and centrifuge experiments
A critical investigation of three constitutive models for clay by means of analyses of a sophisticated laboratory testing program and of centrifuge tests on monopiles in clay subjected to (cyclic) lateral loading is presented. Constitutive models of varying complexity, namely the basic Modified Cam Clay model, the hypoplastic model with Intergranular Strain (known as Clay hypoplasticity model) and the more recently proposed anisotropic visco-ISA model, are considered. From the simulations of the centrifuge tests with monotonic loading it is concluded that all three constitutive models give satisfactory results if a proper calibration of constitutive model parameters and proper initialisation of state variables is ensured. In the case of cyclic loading, the AVISA model is found to perform superior to the hypoplastic model with Intergranular Strain.
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