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<p>Soil salinization is an important factor affecting the durability deterioration of infrastructure structures in northwest China. The salt migration and crystallization caused by soil salinization have a significant impact on the thermo-electrophysical properties of soil. In this paper, the resistivity test and thermal conductivity test of soil with different moisture content and different Na<sub>2</sub>SO<sub>4</sub> content were carried out to explore the response law of different moisture and salt content to the thermoelectric physical properties of soil. The test results show that the resistivity decreases with the increase of Na<sub>2</sub>SO<sub>4</sub> content under the premise of moisture in the soil, and the change is the most obvious from 0 to 2%, and the effect of sodium sulfate on the resistivity of the soil is dominant. On the whole, the thermal conductivity decreases with the increase of Na<sub>2</sub>SO<sub>4</sub> content ( 0% → 6%), but the moisture content is the main influencing factor of the change of soil thermal conductivity. The synergistic change of soil thermal and electrical properties is based on the change of heat transfer path and conduction path caused by the three-phase mutual conversion and the dynamic compression of the electric double layer. This study can provide a theoretical basis for early warning of engineering diseases in saline soil areas.</p>

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Study on the Threshold of Sodium Sulfate Saline Soil Based on the Synergistic Response of Resistivity and Thermal Conductivity

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Hui Liu,
  • Qiang Sun,
  • Kai Cui,
  • Qiang Li,
  • Jingjing Nan,
  • Shibo Li,
  • YuXin Zhang

摘要

Soil salinization is an important factor affecting the durability deterioration of infrastructure structures in northwest China. The salt migration and crystallization caused by soil salinization have a significant impact on the thermo-electrophysical properties of soil. In this paper, the resistivity test and thermal conductivity test of soil with different moisture content and different Na2SO4 content were carried out to explore the response law of different moisture and salt content to the thermoelectric physical properties of soil. The test results show that the resistivity decreases with the increase of Na2SO4 content under the premise of moisture in the soil, and the change is the most obvious from 0 to 2%, and the effect of sodium sulfate on the resistivity of the soil is dominant. On the whole, the thermal conductivity decreases with the increase of Na2SO4 content ( 0% → 6%), but the moisture content is the main influencing factor of the change of soil thermal conductivity. The synergistic change of soil thermal and electrical properties is based on the change of heat transfer path and conduction path caused by the three-phase mutual conversion and the dynamic compression of the electric double layer. This study can provide a theoretical basis for early warning of engineering diseases in saline soil areas.