Elasto-plastic behaviour of frozen soil subjected to long-term low-level repeated loading, Part II: Constitutive modelling
Elasto-plastic behaviour of frozen soil subjected to long-term low-level repeated loading, Part II: Constitutive modelling
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DOI：
10.1016/j.coldregions.2015.11.009
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发表时间：
2016-02
影响因子：
4.1
通讯作者：
Qionglin Li;X. Ling;D. Sheng
中科院分区：
文献类型：
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作者：
Qionglin Li;X. Ling;D. Sheng
在第一部分试验研究结论的基础上，推导了冻土累积剪切应变、累积方向比和弹性模量的经验方程。在试验结果中观察到的基本问题也可以在这些经验方程中观察到。在此基础上，结合经验方程和经典弹塑性理论，建立了冻土长期低强度重复加载本构模型。该模型考虑了累积行为对初始应力状态、重复应力幅值和冻土强度的依赖性。此外，还考虑了弹性模量随累积应变的演化规律。利用第一部分的三轴试验结果对模型进行了验证。本研究首次尝试建立冻土在长期低水平重复荷载作用下的弹塑性特性模型。
Based on the conclusions from the experimental investigation in Part I, empirical equations for the accumulated shear strain, accumulated direction ratio and elastic modulus of frozen soil are derived. The basic issues observed in the test results can also be observed in these empirical equations. Subsequently, an elaborate constitutive model for frozen soil subjected to long-term low-level repeated loading is produced by combining the empirical equations and classical elasto-plastic theory. This model accounts for the dependency of the accumulated behaviour on the initial stress state, repeated stress amplitude and frozen soil strength. In addition, the evolution behaviour of the elastic modulus with accumulated strain is also considered. The model is verified for frozen soil with the aid of the triaxial test results represented in Part I. This study is the first attempt to model the elasto-plastic behaviour under long-term low-level repeated loading for frozen soil.