温度梯度作用下非饱和盐渍土水盐迁移及变形特性研究

doi:10.13722/j.cnki.jrme.2020.0447

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摘要基于多孔介质理论以及连续介质力学原理，建立了温度梯度作用下非饱和盐渍土水–热–盐–力多场全耦合数学模型。该模型从固、液、气三相系统的质量、能量和动量三大守恒定律出发，考虑孔隙率演化、水体渗流、气体传输、盐分解吸–吸附效应、固体颗粒和孔隙流体可压缩性等因素的影响，更为准确地描述了非饱和盐渍土热质传输过程及其变形特性。此外，通过选取孔隙率、孔隙水压力、孔隙气压力、温度、含盐量和位移等基本未知量，并利用Comsol Multiphysics多物理场仿真软件对上述多场耦合过程进行了数值模拟。通过室内试验的实测结果对数学模型及模拟结果加以验证。结果表明，该模型可以较好地揭示非饱和盐渍土在温度梯度作用下的水、盐迁移机制和变形机制。同时，数值分析过程也进一步深化了对盐渍土水盐迁移及其变形特性的认识。对盐分吸附作用的研究也为进一步研究盐渍土的盐胀作用提供了理论准备。

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	周凤玺1
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	周立增1
	王立业1
	李双洋2

关键词 ：土力学, 非饱和盐渍土, 水盐迁移, 变形特性, 解吸&ndash, 吸附效应, 数值模拟, 试验验证

Abstract：Based on the porous media theory and the continuum mechanics，a fully coupled water-heat-salt-force multi-field model for unsaturated saline soil under temperature gradient is established. The model obeys the conservation laws of mass，energy and momentum of the three-phase system of solid，liquid and gas，takes into account the influences of porosity evolution，water seepage，gas transport，salt desorption-adsorption effect and compressibility of solid particles and pore fluids，and hence，can more accurately describe and explain the heat and mass migration processes and deformation characteristics in unsaturated saline soil. In addition，by selecting the basic unknowns such as porosity，pore water pressure，pore gas pressure，temperature，salt content and displacement，the above multi-field coupling process is simulated by using Comsol Multiphysics software. The mathematical model and simulation results are verified by the experimental results. The results show that the model can well reveal the water and salt migration mechanism and deformation mechanism of unsaturated saline soil under temperature gradient. At the same time，the process of numerical analysis has further deepened the understanding of water and salt migration and deformation processes of saline soil. The study of salt adsorption also provides theoretical preparation for further study of salt expansion of saline soil.

Key words： soil mechanics unsaturated saline soil water-salt migration deformation properties desorption- adsorption effect numerical simulation experimental verification

引用本文:

周凤玺1，2，周立增1，王立业1，李双洋2. 温度梯度作用下非饱和盐渍土水盐迁移及变形特性研究[J]. 岩石力学与工程学报, 2020, 39(10): 2115-2130.
ZHOU Fengxi1，2，ZHOU Lizeng1，WANG Liye1，LI Shuangyang2. Study on water and salt migration and deformation properties of unsaturated saline soil under temperature gradient. , 2020, 39(10): 2115-2130.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0447 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I10/2115

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