低塑性粉土為台灣西南部地區土層常見之細粒料，因其具有顆粒細小、
塑性低的特性，低塑性粉土層受內部水流沖蝕作用時，細粒料易造成流
失，使土壤孔隙增大，強度發生弱化現象，進而引致許多深開挖管湧工
程災害，故有必要針對低塑性粉土的內沖蝕效應做更深入的探討，以提
供工程設計施工參考。
本研究以Flexible Wall Pinhole（簡稱FWP）試驗儀，採用高雄苓雅
區之低塑性粉土，經由控制不同試體條件(FC=0、20 及40%，Dr=60 及
85%)，探討各種有效應力狀態下(σc’=100、150 及200kPa)對土壤內沖蝕
性質之影響。
根據試驗結果發現，對會發生內沖蝕破壞之土樣而言，試體在相同
低塑性細粒料含量條件下，其剪力強度及抗內沖蝕能力會隨有效圍壓增
加而提高，而隨著試體緊密程度的提高，抗沖蝕能力也隨之提高；在相
同有效圍壓與相對密度條件下，臨界沖蝕壓力有隨細粒料含量增加而降
低之趨勢，且隨著細粒料含量增加，試體受內沖蝕作用後之剪力強度摩
擦角及強度衰減比皆有下降的趨勢，可見細粒料含量對土壤抗沖蝕能力
有不利的影響；最後，在土樣適用性之討論方面，本研究分別採用日本
神奈川縣土壤與高雄苓雅區土樣進行比對，試驗結果顯示，土壤之抗沖
蝕能力受土壤顆粒組構型態影響較大，而受土樣來源的影響較小。
綜合以上結果可知，FWP 試驗法可用於探討不同地區土壤之內沖蝕
性質，對於低塑性粉土而言，可藉由降低地下水位差與提高土層密度等
方法，增加其抗內沖蝕作用之能力。

Low plasticity silt soil is quite popular in the stratum in southwestern of
Taiwan. Due to the characteristic of fine grain and low plasticity, it can easy
lose by internal erosion effects. The low plastic silty sand has caused disasters
in several deep excavation projects in Taiwan.
In this study, the Flexible Wall Pinhole tests were conducted under
different confining pressures to investigate internal erosion effects of different
samples conditions. The samples of low plasticity silt were collected from
Kaohsiung Lingya district.
Based on test results, the shear strength and the internal erosion resistance
of disturbance samples were increasing as the confining pressures and the
degree of soil tightness increased. In the same confining pressures and relative
density conditions, the critical erosion pressures had decreasing trend as the
fine content of sample increased. In addition, with the increase of fine content,
the erosion samples’ shear strength decay was evident. In the applicability of
different soil strata, using Kanagawa soil in Japan and Lingya District soil in
Kaohsiung conducted FWP test. According to the test data, the internal
erosion resistance of different soil strata had greater relation with particle size
distribution curve than the source of soil.
In summary, FWP test can be used to explore the property of internal
erosion from different area soil. For low plastic silt, reducing the groundwater
level and increasing the soil density can increase its internal erosion
resistance.

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