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<p>Earth dams using Jiangxi lateritic soil have been widely constructed in China. The water retention behavior of lateritic soil varied when subjected to reservoir fluctuations, influencing the safety and stability of earth dam. For this reason, the water retention behavior of Jiangxi lateritic soil and its microscopic mechanism under drying–wetting (D–W) cycles were investigated. The numbers of D–W cycles <i>N</i> = 1, 3 and 5 were considered. At the macro-scale, the filter paper method was adopted for the soil–water retention curve (SWRC) measurements. At the micro-scale, the mercury intrusion porosimetry and scanning electron microscope tests were conducted for microstructural observation. The results showed that under a given <i>N</i> value, the double S-shaped SWRC of lateritic soil was exhibited, with two air entry values (AEV<sub>1</sub> and AEV<sub>2</sub>) identified. This was accompanied by the double peak hysteresis of SWRC at these two AEV<sub>S</sub>. The bi-modal pore size distribution (PSD) curve was observed, which was separated into four ranges. It was found that the double S-shaped SWRC was divided into four zones, which were dependent on the corresponding four ranges of PSD curve, respectively. Meanwhile, the <i>d</i><sub>1</sub> (the dominant macro-pores size), <i>d</i><sub>inf</sub> (pore diameter at the inflection point) and <i>d</i><sub>2</sub> (the dominant micro-pores size) in PSD curve were consistent with AEV<sub>1</sub>, <i>ψ</i><sub>inf</sub> (the suction at the inflection point) and AEV<sub>2</sub> in SWRC by Young–Laplace equation, respectively. With increasing <i>N</i>, the decrease in water retention capacity of four zones of SWRC was explained by the corresponding increase in pore size of four ranges.</p>

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Soil water retention behavior and microstructure evolution of Jiangxi lateritic soil subjected to drying-wetting cycles

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Yu Su,
  • Yue Zhang,
  • Jianglin Gao,
  • Chuangbing Zhou,
  • Junyi Duan,
  • Bo Han,
  • Wenzhe Zhu,
  • Da Liu,
  • Hao Wang,
  • Jingjing Meng

摘要

Earth dams using Jiangxi lateritic soil have been widely constructed in China. The water retention behavior of lateritic soil varied when subjected to reservoir fluctuations, influencing the safety and stability of earth dam. For this reason, the water retention behavior of Jiangxi lateritic soil and its microscopic mechanism under drying–wetting (D–W) cycles were investigated. The numbers of D–W cycles N = 1, 3 and 5 were considered. At the macro-scale, the filter paper method was adopted for the soil–water retention curve (SWRC) measurements. At the micro-scale, the mercury intrusion porosimetry and scanning electron microscope tests were conducted for microstructural observation. The results showed that under a given N value, the double S-shaped SWRC of lateritic soil was exhibited, with two air entry values (AEV1 and AEV2) identified. This was accompanied by the double peak hysteresis of SWRC at these two AEVS. The bi-modal pore size distribution (PSD) curve was observed, which was separated into four ranges. It was found that the double S-shaped SWRC was divided into four zones, which were dependent on the corresponding four ranges of PSD curve, respectively. Meanwhile, the d1 (the dominant macro-pores size), dinf (pore diameter at the inflection point) and d2 (the dominant micro-pores size) in PSD curve were consistent with AEV1, ψinf (the suction at the inflection point) and AEV2 in SWRC by Young–Laplace equation, respectively. With increasing N, the decrease in water retention capacity of four zones of SWRC was explained by the corresponding increase in pore size of four ranges.