Development of prediction method and elucidation of seepage failure mechanism that occurs at the boundary between ground and irrigation facilitie

本研究旨在揭示混凝土防渗墙、渠首工程等灌溉设施与地面交界处的渗透破坏机理。研究结果表明，以往的渗流破坏评价方法不可能评价灌溉设施周围土壤的颗粒尺寸的影响。我们提出了一种新的评估方法，可以评估颗粒尺寸的影响。通过模型试验，研究了随着灌溉设施的移动，地面发生渗透破坏的情况。模型试验表明，在考虑灌溉设施的安全性时，必须同时考虑渗流和水压力的影响。此外，我们还开发了一种分析方法，可以同时表示地面的渗透破坏和灌溉设施的运动。

This study is the study for the purpose of revealing the mechanism of seepage failure occurring at the boundary between the ground and irrigation facilities such as concrete embankments and headworks. The results of this study indicated that the previous seepage failure assessment methods are not possible to assess the effect of particle size of the soil around the irrigation facilities. We proposed a new assessment method that can evaluate the effect of particle size. We conducted the model tests that seepage failure occur at the ground with the movement of the irrigation facilities. This model tests indicated that it is necessary to consider the seepage as well as water pressure in the safety of the irrigation facilities. In addition, we have developed an analysis method that can be expressed at the same time the seepage failure of ground and movement of irrigation facilities.