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МОДЕЛИРОВАНИЕ СВЯЗАННЫХ ПРОЦЕССОВ ТЕПЛОВЛАГОПЕРЕНОСА И ДЕФОРМИРОВАНИЯ МЕРЗЛОГО ГРУНТА Modeling of coupled heat-moisture-deformation of frozen soil

Min He, Xiaopeng Feng, Ning Li

Аннотация


Усовершенствованы уравнения равновесия, неразрывности и сохранения энергии для построения связанной модели деформирования и тепло-влагопереноса для мерзлого грунта с учетом миграции влаги под действием градиента температуры в зоне промерзания. Разработана конечно-элементная программа для плоской задачи, учитывающая инженерную специфику в регионах с холодным климатом. Представлены результаты анализа лабораторного теста Пеннера на пучение для проверки
рациональности и надежности предлагаемой модели. Полученные значения деформаций пучения, распределение температуры и влажности хорошо согласуются с экспериментальными данными. Разработанный подход применим для изучения связанного тепло-влаго-деформационного поведения промерзающего грунта с учетом фазовых переходов.

 In this paper, the momentum equilibrium equation, the continuity equation and the energy equation of the coupled heat-moisture transfer-deformation model are improved for frozen soil through the introduction of Clapeyron equation to describe the temperature gradient on the moisture migration in freezing zone and considering of the actual characteristics of cold regions engineering. Moreover, the program of the FEM resolution for the coupled model of thermal-moisture -deformation behavior for civil engineering in cold zone is established under the plane strain. The simulating results for analyzing the Penner’s lab heaving test are introduced to validate the rationality and the reliability of the proposed model. The predicted values of frost heave, temperature and moisture distribution are consistent with the experimental data, and it is demonstrated that the presented approach is valid for studying heat transfer coupled problem with phase change in freezing soil.

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Литература


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