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<p>Widely distributed in nature, expansive soils are highly susceptible to landslides following rainfall. These soils undergo drying–wetting cycles due to seasonal climate changes, which alter pore structure, causing volumetric expansion, shrinkage cracks, and changes in permeability and strength. However, studies on soil–water characteristic curve (SWCC) under varying stress conditions are still scarce. Examining the SWCC of expansive soils during wetting–drying cycles is essential for gaining insights into their pore structure and hydraulic behavior. This research performed stress-dependent soil–water characteristic curve (SD-SWCC) tests on expansive soil to investigate how drying–wetting cycles and stress conditions influence the evolution of pore structure. Results show that increasing drying–wetting cycles and applied stress reduce the hysteresis loop size, indicating pore size homogenization and reduction. The observed difference in one-dimensional settlement between loading and unloading phases highlights the significant influence of stress history on SWCC. Furthermore, variations in water content reveal insights into pore structure changes. The findings suggest that soil structure evolution during drying–wetting cycles is governed by both stress history and cycling history. Finally, an elastoplastic constitutive model is adopted to quantitatively describe the stress-dependent wetting–drying process, with key parameters derived from experimental data.</p>

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The role of stress states on soil–water characteristics of expansive soil under multiple drying–wetting cycles

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Xiaoyue Li,
  • Xue Li,
  • Xiaoping Ye

摘要

Widely distributed in nature, expansive soils are highly susceptible to landslides following rainfall. These soils undergo drying–wetting cycles due to seasonal climate changes, which alter pore structure, causing volumetric expansion, shrinkage cracks, and changes in permeability and strength. However, studies on soil–water characteristic curve (SWCC) under varying stress conditions are still scarce. Examining the SWCC of expansive soils during wetting–drying cycles is essential for gaining insights into their pore structure and hydraulic behavior. This research performed stress-dependent soil–water characteristic curve (SD-SWCC) tests on expansive soil to investigate how drying–wetting cycles and stress conditions influence the evolution of pore structure. Results show that increasing drying–wetting cycles and applied stress reduce the hysteresis loop size, indicating pore size homogenization and reduction. The observed difference in one-dimensional settlement between loading and unloading phases highlights the significant influence of stress history on SWCC. Furthermore, variations in water content reveal insights into pore structure changes. The findings suggest that soil structure evolution during drying–wetting cycles is governed by both stress history and cycling history. Finally, an elastoplastic constitutive model is adopted to quantitatively describe the stress-dependent wetting–drying process, with key parameters derived from experimental data.