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<p>Loess has the characteristics of water sensitivity and weak cementation, and is prone to disasters such as roadbed instability and landslides under extreme rainfall. In order to explore the law of water migration inside loess roadbeds under extreme rainfall conditions, the loess roadbed was taken as the research object, and the GEO-STUDIO software was used to build a two-dimensional model of water migration in loess roadbeds for simulation. The water migration process under different rainfall intensities, rainfall frequencies, and rainfall-evaporation double cycles was investigated, and the spatiotemporal variation laws of volumetric water content and pore water pressure were analyzed, revealing the mechanism of roadbed rainfall infiltration. The results show that under the three different rainfall intensities, with the increase of rainfall intensity and frequency, the range of water’s influence on the soil expands, the isopleths become sparser, and the saturated area extends towards the inside of the roadbed; the pore water pressure increases from the initial value of -130&#xa0;kPa to a positive value, and positive pore water pressure first appears at the foot of the slope, where the soil there remains at a high volumetric water content for a long time. Under the rainfall-evaporation condition, the volumetric water content at the slope surface shows a decreasing trend after the rain stops, the influence weakens with the increase of horizontal depth, and the response lags; along the horizontal direction from the slope surface inward, the distribution of water and pore water pressure exhibits a spatial pattern of initially increasing and then decreasing, and the foot of the slope reaches the saturated volumetric water content and positive pore water pressure first; the maximum influence depth of evaporation is 0.77&#xa0;m in the horizontal direction within 24&#xa0;h, and extends to 0.95&#xa0;m within 48&#xa0;h and 72&#xa0;h; the maximum influence depth of pore water pressure expands from 0.8&#xa0;m at 24&#xa0;h to 0.94&#xa0;m at 48&#xa0;h and 0.95&#xa0;m at 72&#xa0;h. Furthermore, evaporation is both a way of water loss and a driving force for water migration. The research results have certain engineering significance for the prevention and control of roadbed water damage diseases.</p>

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Numerical simulation on water migration in compacted loess subgrade under extreme rainfall conditions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年8月1日

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  • Binyu Du,
  • Yu Xi,
  • Gang Li,
  • Xueqing Hua,
  • Siyuan Chen

摘要

Loess has the characteristics of water sensitivity and weak cementation, and is prone to disasters such as roadbed instability and landslides under extreme rainfall. In order to explore the law of water migration inside loess roadbeds under extreme rainfall conditions, the loess roadbed was taken as the research object, and the GEO-STUDIO software was used to build a two-dimensional model of water migration in loess roadbeds for simulation. The water migration process under different rainfall intensities, rainfall frequencies, and rainfall-evaporation double cycles was investigated, and the spatiotemporal variation laws of volumetric water content and pore water pressure were analyzed, revealing the mechanism of roadbed rainfall infiltration. The results show that under the three different rainfall intensities, with the increase of rainfall intensity and frequency, the range of water’s influence on the soil expands, the isopleths become sparser, and the saturated area extends towards the inside of the roadbed; the pore water pressure increases from the initial value of -130 kPa to a positive value, and positive pore water pressure first appears at the foot of the slope, where the soil there remains at a high volumetric water content for a long time. Under the rainfall-evaporation condition, the volumetric water content at the slope surface shows a decreasing trend after the rain stops, the influence weakens with the increase of horizontal depth, and the response lags; along the horizontal direction from the slope surface inward, the distribution of water and pore water pressure exhibits a spatial pattern of initially increasing and then decreasing, and the foot of the slope reaches the saturated volumetric water content and positive pore water pressure first; the maximum influence depth of evaporation is 0.77 m in the horizontal direction within 24 h, and extends to 0.95 m within 48 h and 72 h; the maximum influence depth of pore water pressure expands from 0.8 m at 24 h to 0.94 m at 48 h and 0.95 m at 72 h. Furthermore, evaporation is both a way of water loss and a driving force for water migration. The research results have certain engineering significance for the prevention and control of roadbed water damage diseases.