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A Capped Constitutive Model for Frozen-Thawed soil
Transportation Geotechnics ( IF 5.3 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.trgeo.2020.100449
Mohammad Vahdani , Mahmoud Ghazavi , Mahya Roustaei

Roadbeds usually experience various freezing and thawing regimes. Thus, in the present study, an experiment was performed comprising 46 successive triaxial tests conducted under different confining pressures and freezing regimes to develop a constitutive model capable of predicting the behavior of soil under different freezing regimes. Then, some novelties were introduced to improve the performance of the constitutive model. The novelties were providing a generalized strain and stress tensor including temperature as an extra-variable, introducing a capped yield surface responsible for thermal and mechanical strains, separately and finally, generating a linearized integration technique to provide the simultaneous thermal and mechanical loadings. A comparison between the numerically predicted results and existing experimental data demonstrated a reasonable performance under the accepted conditions. However, some further studies are needed to cover the relatively biased predictions in large deformations.



中文翻译:

冻融土的上限本构模型

路基通常会经历各种冻结和解冻状态。因此,在本研究中,进行了一项包含46个连续三轴试验的实验,该试验在不同的围压和冻结条件下进行,以开发能够预测不同冻结条件下土壤行为的本构模型。然后,引入了一些新颖性来改善本构模型的性能。这些新颖性提供了广义的应变和应力张量,包括温度作为额外变量,分别引入了负责热应变和机械应变的封闭屈服面,最终产生了线性化积分技术,以同时提供热负荷和机械负荷。数值预测结果与现有实验数据之间的比较证明了在可接受条件下的合理性能。但是,需要进行一些进一步的研究来涵盖大变形中相对偏向的预测。

更新日期:2020-10-02
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