為了改善河堤、海堤等堤防水工構造物在豪雨與洪水作用下之穩定性，本研究提出以纖維加勁土壤(Fiber-reinforced soil)為土堤的回填材料，進行了一系列的砂箱物理模型試驗，模型試驗以未加勁與纖維加勁土壤作比較。利用纖維加勁土壤增加土壤的剪力強度以及改善土壤抵抗管湧作用的能力，探討纖維加勁土堤受滲流作用下之力學行為與穩定性，評估其應用於土堤滲流作用下的整體表現。此外，本研究亦考慮增設濾層於土堤坡趾處防止滲流所產生的沖蝕破壞。根據試驗結果顯示，於土堤坡面處加入纖維加勁土壤後，可以提高土堤的穩定性，縮小破壞弧發展的範圍，並延後滲流所造成土堤的破壞時間，亦拉長每階段破壞的時間間隔。模型試驗也證實，當纖維加勁土壤鋪設寬度為0.3倍的土堤高(L/H = 0.3)，於土堤坡趾處增設濾層後，在滲流作用下能維持其穩定性，因為濾層能有效控制纖維加勁土壤坡趾掏刷沖蝕的現象，避免了坡趾支撐流失，而造成後續土體破壞的產生。

It has been proven that adding fibers to soil, known as fiber-reinforced soil (FRS), can effectively increase the soil shear strength and improve the piping resistance against seepage. However, the effect of FRS backfilled inside embankments, levees, and the hydraulic structures on improving their stability under seepage conditions has not been fully studied. Accordingly, a series of model tests was conducted to evaluate the performance and stability of embankments backfilled with FRS subjected to seepage. In addition, tests were also conducted to evaluate the effect of placing a filter layer at the toe of the embankment on preventing the seepage induced soil erosion. The test variables are with or without the use of FRS as backfill, the reinforced area of the embankment model, and with or without the placement of the toe filter layer. During test, the distribution and variation of soil water content and porewater pressure were monitored. The failure process and failure mode of embankments were also observed. The test results show FRS can increase the system stability, decrease the failure area, delay the failure timing. The model test confirmed that when the width of reinforced area equals to 0.3 times the embankment height (L/H = 0.3), the embankment with the toe filter layer maintains stable under seepage conditions. The test results also demonstrated that the toe filter layer can effectively resist the soil erosion at the toe and thus prevent the subsequent slope failure due to the loss of soil support at the toe. In the context of disaster mitigation, the research results can be applied to the engineering projects, involving design and repair of river levees, earth dams, and river bank restoration, for effectively controlling seepage within those hydraulic structures.

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