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<p>The displacement, groundwater level (GWL), suction, and volumetric water content (VWC) of a small-scale model slope under repeated rainfall events were measured to examine the mechanism of the delay in displacement from the rise of the GWL. In some cases (Type A), the surface displacement (SD) remained constant despite a rapid rise in the GWL at the onset of the final rainfall, while in other cases (Type B), the SD increased significantly and led to failure as the GWL rose just prior to failure. In Type A cases, the SD did not initially increase during a significant rise in the GWL but then increased until failure, with a gradual rise or slight variation in the GWL. The temporal variations in the suction and VWC of the model slopes were examined to clarify the mechanism of the delay in displacement from the GWL rise. The suction decreased during the rise in the GWL at the onset of the final rainfall in Type A cases, whereas the suction was almost zero during the rise in the GWL just before failure in Type B cases. The SD also increased significantly until failure, with almost zero suction under an almost constant GWL, even in Type A cases. These facts suggest that SD increases significantly until failure under almost zero suction, even though the GWL shows slight variation. The results suggest that suction is more important than the GWL for identifying the time of failure of a slope under rainfall.</p>

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Delay in shear deformation from groundwater level rise in sandy model slopes during repeated rainfall events

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Katsuo Sasahara

摘要

The displacement, groundwater level (GWL), suction, and volumetric water content (VWC) of a small-scale model slope under repeated rainfall events were measured to examine the mechanism of the delay in displacement from the rise of the GWL. In some cases (Type A), the surface displacement (SD) remained constant despite a rapid rise in the GWL at the onset of the final rainfall, while in other cases (Type B), the SD increased significantly and led to failure as the GWL rose just prior to failure. In Type A cases, the SD did not initially increase during a significant rise in the GWL but then increased until failure, with a gradual rise or slight variation in the GWL. The temporal variations in the suction and VWC of the model slopes were examined to clarify the mechanism of the delay in displacement from the GWL rise. The suction decreased during the rise in the GWL at the onset of the final rainfall in Type A cases, whereas the suction was almost zero during the rise in the GWL just before failure in Type B cases. The SD also increased significantly until failure, with almost zero suction under an almost constant GWL, even in Type A cases. These facts suggest that SD increases significantly until failure under almost zero suction, even though the GWL shows slight variation. The results suggest that suction is more important than the GWL for identifying the time of failure of a slope under rainfall.