Steady-state analysis of the heat-moisture-salt coupling for unsaturated soil

ZHOU Feng-xi; GAO Guo-yao

doi:10.16285/j.rsm.2018.0306

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Steady-state analysis of the heat-moisture-salt coupling for unsaturated soil

更新时间：2026-06-25

- Steady-state analysis of the heat-moisture-salt coupling for unsaturated soil
- Vol. 40, Issue 6, Pages: 2050-2058(2019)
- 作者机构：
  
  1. 兰州理工大学土木工程学院,甘肃,兰州,730050
  2. 兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃,兰州,730050
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.0306
  CLC： TU431
- Online First：20 June 2019，
  
  Published：2019
- 稿件说明：
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ZHOU Feng-xi, GAO Guo-yao. Steady-state analysis of the heat-moisture-salt coupling for unsaturated soil[J]. 2019, 40(6): 2050-2058.
DOI：

ZHOU Feng-xi, GAO Guo-yao. Steady-state analysis of the heat-moisture-salt coupling for unsaturated soil[J]. 2019, 40(6): 2050-2058. DOI： 10.16285/j.rsm.2018.0306.

摘要

以多孔介质理论为基础，研究了稳态条件下非饱和土中温度?水分?盐分多场耦合问题。考虑非饱和土的孔隙被液态水、溶解的盐分、水蒸气和干燥气体等填充，在质量和能量守恒的基础上获得了非饱和土中水分、气体、盐分的质量守恒方程以及能量守恒方程。考虑一维稳态问题，选取温度、孔隙气压、孔隙水压和盐溶液浓度以及它们的导数作为状态变量，得到了问题的状态方程组。在给定的边界条件下，采用打靶法求解了该强耦合的非线性变系数微分方程组，通过与已有的试验结果相比较，验证了模型的有效性。基于数值算例，参数分析了含水率、温度边界、孔隙率等条件对非饱和土中温度场、水分场和盐分场分布的影响规律。

Abstract

The multi-field coupled heat-moisture-salt behavior of unsaturated soils under steady state is investigated using porous media theory. It considers that the pores are filled with liquid water

dissolved salts

water vapor

and dry gas. The mass conservation equations of moisture

gas

and salinity in unsaturated soils and the energy conservation equations are presented. Considering one-dimensional steady-state problems

the state equations are obtained by using the temperature

pore pressure

pore water pressure and salt solution concentration and their first-order derivatives as the state variables. Under given boundary conditions

the coupled nonlinear differential equations for the varying coefficients are solved by shooting method. The validity of the model is verified by comparing with the existing experimental results. Based on numerical examples

the influence of moisture content

temperature boundary and porosity on the distribution of temperature field

water field and salt field in unsaturated soils was discussed in detail.

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Related Institution

Department of Engineering Mechanics, Dalian University of Technology

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Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology

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