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针对冻土冻融过程中存在移动相变界面及材料分区不断变化的特点,基于已建立的能全面地描述冻土的水、热、力与变形实际状态的准饱和冻土耦合模型,推导土颗粒、水和冰颗粒的温度场、变形场及水分场的扩展有限元解析格式,构建水热力相互作用在程序中实现的具体方法,开发一款能够为实际冻土工程服务的耦合分析平台3GEXFEM,利用程序对Fukuda系列试验进行数值模拟,分析得到的温度场、水分场与变形场与试验结果较一致,验证了程序的合理性和先进性。此外,基于程序系统地研究不同环境条件:上覆压力、温度梯度、变温模式、温变速率对冻土冻结过程中水热力耦合的影响,为模型及程序的工程应用奠定了基础。
In view of the characteristics of the moving phase change interface and the material subdivision during the freeze-thaw process of frozen soil, based on the established coupled model of quasi-saturated frozen soil that can fully describe the actual state of frozen soil water, heat, force and deformation, Expanded Finite Element Analytical Format for Temperature Field, Deformation Field and Moisture Field for Particles, Water and Ice Particles to Construct Specific Methods of Hydrothermal Interaction in Procedures to Develop a Coupling Analysis Platform to Serve Actual Frozen Soil Engineering 3GEXFEM , The Fukuda series of experiments were simulated by using the program. The analysis of the temperature field, the water field and the deformation field are in good agreement with the experimental results, which proves the rationality and advancement of the program. In addition, systematic study of different environmental conditions: overburden pressure, temperature gradient, temperature change mode, temperature change rate of frozen soil during the freezing process of hydrothermal coupling, which laid the foundation for the model and program engineering application.