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随着地下工程的发展,人工冻结法已成为地下工程建设中常用的技术。关于人工冻土在冻结过程中温度场的发展规律以及冻结过程中因为冻胀产生的对周边环境的影响有待于进一步深入的研究。通过室内试验得出了热物理参数随温度场的变化规律,结合天津地铁某联络通道的人工冻土工程,提出并建立了人工冻结过程中考虑热物理参数随温度变化的热–力耦合的数值计算方法,利用该方法计算分析了人工冻结过程中土体的温度场和位移场的发展规律,通过与实测数据对比,证明了该方法的可行性,成果可以指导人工冻土工程的设计与施工。
With the development of underground engineering, artificial freezing has become a commonly used technique in underground engineering construction. The development of the temperature field during the freezing process of the artificial frozen soil and the impact on the surrounding environment caused by frost heaving during the freezing process need to be further studied. The variation of thermophysical parameters with temperature field was obtained through laboratory tests. Combined with the artificial frozen soil engineering of a certain communication channel in the Tianjin Subway, the numerical values of the thermo-mechanical coupling considering the change of thermophysical parameters with temperature during the artificial freezing process were proposed and established. The calculation method uses this method to calculate and analyze the development law of the temperature field and displacement field of the soil in the process of artificial freezing. Through comparison with the measured data, the feasibility of the method is proved, and the results can guide the design and construction of the artificial frozen soil engineering. .