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<p>To explore the influences of osmotic suction on the hydromechanical behaviors and micro-structures of compacted red clay in contaminated sites, a series of triaxial shear strength tests and micro-structure tests were conducted under different osmotic suction and confining pressures. The test results demonstrated that the shear strength of the compacted red clay decreased with an increase in the osmotic suction, showing a chemical softening phenomenon. Under a high confining pressure, the shear strength of the compacted red clay was less affected by the osmotic suction. The failure stress decreased linearly with an increase in the osmotic suction. In addition, the permeability coefficient of the compacted red clay decreased with an increase in the osmotic suction. The micro-structure test results showed that with an increase in the pore water concentration, the soil particles condensed into aggregates from the dispersed structure, reducing the shear strength. The void ratio of the macro-pores decreased with an increase in the pore water concentration, and the soil structure changed from a uniformly dispersed structure to a flocculated structure. Therefore, the permeability coefficient was accordingly reduced.</p>

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Influence of osmotic suction on the hydro-mechanical behavior and micro-structure of compacted red clay in contaminated sites

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月25日

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  • Chuang Zhang,
  • Yong He,
  • Jianzhong Li

摘要

To explore the influences of osmotic suction on the hydromechanical behaviors and micro-structures of compacted red clay in contaminated sites, a series of triaxial shear strength tests and micro-structure tests were conducted under different osmotic suction and confining pressures. The test results demonstrated that the shear strength of the compacted red clay decreased with an increase in the osmotic suction, showing a chemical softening phenomenon. Under a high confining pressure, the shear strength of the compacted red clay was less affected by the osmotic suction. The failure stress decreased linearly with an increase in the osmotic suction. In addition, the permeability coefficient of the compacted red clay decreased with an increase in the osmotic suction. The micro-structure test results showed that with an increase in the pore water concentration, the soil particles condensed into aggregates from the dispersed structure, reducing the shear strength. The void ratio of the macro-pores decreased with an increase in the pore water concentration, and the soil structure changed from a uniformly dispersed structure to a flocculated structure. Therefore, the permeability coefficient was accordingly reduced.