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首页> 外文期刊>Computers and Geotechnics >Study on water and salt migration and deformation properties of unsaturated saline soil under a temperature gradient considering salt adsorption: Numerical simulation and experimental verification
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Study on water and salt migration and deformation properties of unsaturated saline soil under a temperature gradient considering salt adsorption: Numerical simulation and experimental verification

机译：考虑盐吸附温度梯度下不饱和盐水土水和盐迁移和变形性能研究：数值模拟与实验验证

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摘要

Based on porous media theory and the principle of continuum mechanics, a mathematical model is established to describe a fully coupled process in a thermo-hydro-solute-gas-mechanical multi-field under a temperature gradient. The model considers the influence of factors, such as porosity evolution, water seepage and its evaporation?condensation, gas transport, salt adsorption/precipitation-dissolution dynamic conversion process, solid particles and pore fluid compressibility. Comsol Multiphysics is used to numerically simulate the previously mentioned multi-field coupling process. In the simulation process, some important physical parameters (such as porosity and medium density) depend on state variables (such as temperature, pore water pressure and salt content). The mathematical model and simulation results are verified through the actual measurement results of the indoor test. Thus, salt adsorption influences the heat and mass transfer process and deformation characteristics of unsaturated saline soil. The results show that the model can better reveal the water and salt transfer mechanism and deformation mechanism of unsaturated saline soil under the action of a temperature gradient, adsorption effects on the heat and mass transfer process and its deformation characteristics by affecting the porosity of the soil. Although in the process of establishing the theoretical model, the elastic constitutive model (including the effective stress principle) is used to describe the momentum conservation of the soil. Additionally, the study of salt adsorption provides theoretical preparation for further research on salt expansion in saline soil.
机译：基于多孔介质理论和连续力学的原理，建立了一种数学模型，在温度梯度下描述热水溶质气机械多场的完全耦合过程。该模型考虑了因素的影响，例如孔隙率进化，水渗透及其蒸发α缩合，气体输送，盐吸附/沉淀 - 溶出动态转化过程，固体颗粒和孔隙流体可压缩性。 COMSOL Multiphysics用于数值上模拟先前提到的多场耦合过程。在模拟过程中，一些重要的物理参数（例如孔隙率和介质密度）取决于状态变量（例如温度，孔隙水压和盐含量）。通过室内测试的实际测量结果来验证数学模型和仿真结果。因此，盐吸附影响不饱和盐渍土的热量和传质过程和变形特征。结果表明，该模型在温度梯度的作用下，可以更好地揭示不饱和盐水土壤的水和盐传递机理和变形机制，通过影响土壤的孔隙率，对热和传质工艺及其变形特性进行吸附作用及其变形特征。虽然在建立理论模型的过程中，弹性本构模型（包括有效应力原理）用于描述土壤的动量守恒。此外，盐吸附的研究为进一步研究盐渍土壤中的盐膨胀研究提供了理论准备。

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