Application of UH model considering temperature to finite element method
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摘要: 由姚仰平等提出的考虑温度UH模型能够描述温度效应对正常固结土以及超固结土应力应变特性的影响规律,并且参数简单,易于工程应用。首先基于考虑温度UH模型,将模型的非对称弹塑性矩阵改进为对称的弹塑性矩阵,并重新推导了该模型的热应变增量表达式;然后应用半隐式回映的应力更新算法,编制了模型的有限元程序,实现了模型在有限元中的应用;并应用所编制的考虑温度UH模型的有限元程序对三轴试验进行了有限元模拟,分析了不同温度条件下的土的应力应变规律,通过有限元计算结果和单元预测结果的比较,说明了有限元程序的正确性,为进一步对温度影响下岩土工程问题的分析打下基础。Abstract: The UH model considering temperature proposed by Yao Yangping et al. can describe the influence law of temperature on the stress and strain characteristics of normal consolidated soil and over-consolidated soil. The parameters of this model are simple, which make the model be applied to the engineering easily. Firstly, based on the UH model considering temperature, the asymmetric elastic-plastic matrix of this model is transformed into a symmetric matrix, and the expression for the thermal strain increment of this model is deduced again. Then the semi-implicit return mapping method is adopted to update the stress, and the finite element program of this model is compiled. Thus the application of UH model considering temperature to finite element method is realized. The finite element simulation of the triaxial tests is carried out using the finite element program of the UH model considering temperature. The stress-strain laws of soil under different temperatures are analyzed. The comparison between finite element and unit predicted results indicates that the finite element program of the UH model considering temperature is correct. It lays a foundation for the further analysis of geotechnique engineering problems under the influence of temperature.
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Keywords:
- UH model /
- temperature /
- finite element /
- triaxial test /
- stress-strain
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