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<p>Unsaturated seepage is one of the fundamental scientific problems in soil mechanics and a key focus of research in the field of geotechnical engineering. This study investigates the application of the wicking geotextiles as subgrade drainage materials in unsaturated soil moisture control through single parameter soil–water characteristic curves and permeability coefficient functions. Starting from the perspective of obtaining a secondary boundary with time variables based on mathematical construction, the control equation for unsaturated soil moisture migration under the action of the wicking geotextiles was equivalently decomposed, and analytical calculations were carried out using the separation of variables method. The analytical expressions for dimensionless permeability coefficient, seepage velocity rate, and volumetric moisture content were obtained. This study conducted drainage tests on silty clay columns with the application of the wicking geotextiles, obtaining the initial basic parameters and boundary conditions for analytical calculation of volumetric moisture content. The effectiveness of the analytical calculation was verified by monitoring the time history change curve of soil column moisture content through the test. The analysis expression can obtain the spatiotemporal distribution law of the moisture content in the soil column. The analysis results showed that the moisture content at the bottom of the soil column decreased from 20.75% to 8.25% in the first 10 h, with a significant change. Then, the wicking geotextile played a role in regulating the moisture content, and the moisture content at the bottom of the soil column decreased from 8.25% to 5.83%. The acquisition of analytical expressions provides a new method for solving the problem of unsaturated soil moisture leakage.</p>

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Analytical Calculation Study on the Water Migration Process of Unsaturated Soil Under the Action of Wicking Geotextiles

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Dongpeng Zhu,
  • Weimin Yang,
  • Kun Yuan,
  • Yifan Bai,
  • Guanlin Sun,
  • Meixia Wang,
  • Lang liu

摘要

Unsaturated seepage is one of the fundamental scientific problems in soil mechanics and a key focus of research in the field of geotechnical engineering. This study investigates the application of the wicking geotextiles as subgrade drainage materials in unsaturated soil moisture control through single parameter soil–water characteristic curves and permeability coefficient functions. Starting from the perspective of obtaining a secondary boundary with time variables based on mathematical construction, the control equation for unsaturated soil moisture migration under the action of the wicking geotextiles was equivalently decomposed, and analytical calculations were carried out using the separation of variables method. The analytical expressions for dimensionless permeability coefficient, seepage velocity rate, and volumetric moisture content were obtained. This study conducted drainage tests on silty clay columns with the application of the wicking geotextiles, obtaining the initial basic parameters and boundary conditions for analytical calculation of volumetric moisture content. The effectiveness of the analytical calculation was verified by monitoring the time history change curve of soil column moisture content through the test. The analysis expression can obtain the spatiotemporal distribution law of the moisture content in the soil column. The analysis results showed that the moisture content at the bottom of the soil column decreased from 20.75% to 8.25% in the first 10 h, with a significant change. Then, the wicking geotextile played a role in regulating the moisture content, and the moisture content at the bottom of the soil column decreased from 8.25% to 5.83%. The acquisition of analytical expressions provides a new method for solving the problem of unsaturated soil moisture leakage.