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<p>The long-term moisture-density evolution of compacted soil was investigated through field investigations and laboratory experiments. Field investigations were conducted on multiple highway subgrades with service lives up to 20 years. Comparison with construction-stage data revealed a progressive increase in moisture content accompanied by a reduction in compaction degree, indicating long-term degradation of the compacted soil structure. Representative soil from a strong monsoonal region with pronounced capillary rise was selected for laboratory testing. Unsaturated triaxial tests were conducted to examine the hydromechanical response of the soil under controlled wetting-drying cycles involving variations in matric suction. The results demonstrated a linear relationship between moisture content and degree of compaction. Repeated wetting-drying cycles weakened the soil-water retention behavior, induced cumulative volumetric expansion, and reduced the moisture-holding capacity of the soil. To characterize the stabilized state of soil subjected to long-term wetting-drying cycles, the concepts of equilibrium moisture content (15.0%-19.6%) and equilibrium degree of compaction (95.3%-92.1%) were proposed. A critical compression-expansion line was established to distinguish between cumulative swelling and shrinkage behavior.</p>

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Long-term Hydro-mechanical Behavior and Equilibrium Characteristics of Compacted Soils in Highway Subgrades Under Wetting-drying Cycles

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Yiyi Liu,
  • Hongguang Jiang,
  • Donge Zhao,
  • Lei Yu,
  • Xiang Wang,
  • Shiguang Huang,
  • Xia Liu,
  • Mengyuan Ma,
  • Yixin Li,
  • Xueyu Geng,
  • Zhanyong Yao

摘要

The long-term moisture-density evolution of compacted soil was investigated through field investigations and laboratory experiments. Field investigations were conducted on multiple highway subgrades with service lives up to 20 years. Comparison with construction-stage data revealed a progressive increase in moisture content accompanied by a reduction in compaction degree, indicating long-term degradation of the compacted soil structure. Representative soil from a strong monsoonal region with pronounced capillary rise was selected for laboratory testing. Unsaturated triaxial tests were conducted to examine the hydromechanical response of the soil under controlled wetting-drying cycles involving variations in matric suction. The results demonstrated a linear relationship between moisture content and degree of compaction. Repeated wetting-drying cycles weakened the soil-water retention behavior, induced cumulative volumetric expansion, and reduced the moisture-holding capacity of the soil. To characterize the stabilized state of soil subjected to long-term wetting-drying cycles, the concepts of equilibrium moisture content (15.0%-19.6%) and equilibrium degree of compaction (95.3%-92.1%) were proposed. A critical compression-expansion line was established to distinguish between cumulative swelling and shrinkage behavior.