本研究之主要目的在藉由 921集集地震台灣中部液化案例與非液化案例建立適用於台灣地區之土壤液化阻抗曲線與細料含量修正式，由於台灣中部地區的土層多為沉泥質砂性土層，含有較高比例的無塑性細料，在進行液化潛能評估時，容易高估細料對土壤液化阻抗之影響，因此，有必要藉由中部地區土層資料建立適地化細料含量修正式與液化阻抗曲線。
　　本研究引用的中部液化區鑽孔資料主要有兩個來源，一為賴宏源(2000)針對南投市軍功寮與振興里、彰化縣大村鄉黃厝村與美港村員林鎮崙雅里、社頭鄉山湖村及台南縣後壁鄉菁寮村 (1022嘉義地震液化案例) ，另一為黃俊鴻及楊志文 (2001)中之288筆中部地區液化與非液化資料，其包含範圍除上述外尚包含台中港區及彰濱工業區，嘉義縣北港鎮、太保市及嘉義市等。
　　本研究之主要內容除了討論液化阻抗影響因素及常見的 SPT-N值液化簡易評估法外，並提出本研究的主要成果－建立適用於台灣高細料含量土層之細料含量修正式與液化阻抗曲線，此外，在發展過程中進一步利用統計方法以了解 SPT-N值的主要影響因素與權重，以期所建立的細料含量修正式在參數的選用上能合乎物理性要求；本研究建立的液化阻抗曲線，以黃俊鴻及楊志文(2001)之 288筆鑽探資料驗証，其整體準確率約可達 95%，其中除了底部夾雜少量礫石的土層，可能因 SPT-N值無法真實呈現現地土層的疏緊程度而可能高估土壤液化阻抗外，其他液化地區的土層皆可被正確判別，由此可以証明本研究之液化阻抗曲線與細料含量修正式應可用於評估台灣地區土層之液
化阻化；此外，本研究建立細料含量修正式的流程可做為其他地區建立細料含量修正式的參考。

　　This purpose of this paper is to develop the suitability correction factor of fines content on the evaluation of liquefaction potential. Because most of the fines in the soil stratum are nonplastic in the central
Taiwan, the liquefaction resistance will be overestimated due to overestimate effect of fines. Therefore, the suitability liquefaction resistance curve and effect of fines content should be developed.
　　The data used in this study are quoted from Li's paper (2000) and Huang and Yang's paper (2001), and they were obtained from holes bored at sites where liquefied or unliquefied during Chi-Chi Earthquake, 1999. The relationship between the SPT-N value and fines content of in situ stratum could be observed from using the data which recorded in Li's paper, and it could be used to develop the
suitable correction factor of fines content. After the suitable correction factor of fines content is developed, the liquefaction resistance curve could be found.
　　A new liquefaction resistance curve and a new correction factor of fines content are developed in this study. The liquefied cases will be almost distinguished validly, except, those with a little gravel mixed into the soil stratum. The liquefaction resistance may be over-
estimated since the SPT-N value and the soil density don't match well for soil stratum is mixed into a little gravel. Hence, the liquefaction resistance curve and the correction
factor of fines content are suitable to evaluatethe soil liquefaction potential of the central Taiwan. Furthermore, the process to develop the correction factor of fines content could be usedas a reference to develop the correction factor of fines content of the other area.

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