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了解人工冻土的蠕变性质对安全建井是非常必要的。目前常用分数阶导数伯格斯蠕变模型来模拟人工冻土的稳定蠕变阶段。如果从内能角度分析发生蠕变的机制,基于应变能理论,采用Perzyna黏塑性理论与分数阶导数伯格斯模型相结合,可以建立一种能描述衰减蠕变、稳定蠕变和加速蠕变3个阶段全过程的蠕变统一本构模型。通过建立模型比较发现,数值模拟结果与试验数据基本吻合,研究成果为人工冻土蠕变过程研究提供了一种新的思路。
Knowing the creep property of artificial permafrost is very necessary for safety well construction. At present, the Burgess creep model of fractional derivative is commonly used to simulate the steady creep stage of artificial frozen soil. Based on the theory of strain energy and the combination of Perzyna’s viscoplasticity theory and fractional-order derivative Burgers model, if one can analyze the mechanism of creep from the perspective of internal energy, we can establish a method that can describe the decay creep, stable creep and accelerated creep Creep Unified Constitutive Model for Three Stages. The comparison between the model and the experimental data shows that the numerical simulation results are in good agreement with the experimental data. The research results provide a new idea for the study of the creep process of artificial permafrost.