標準貫入試驗(SPT)與圓錐貫入試驗(CPT)所得的地層資料常被應用於地層之物理、力學性質分析及液化潛能評估，兩者雖都各有所長，但均須操作大型設備方能取得必要的資料，為改善此缺點本研究發展一套可攜帶之簡易動力圓錐貫入試驗(Dynamic Cone Penetrometer Test，DCPT)設備，包含貫入錐及取樣器，可分別如SPT進行現地取樣，亦可如CPT連續貫入土層中，為一簡便、省時又經濟的現地地層試驗方法。
本研究以台南都會區現有18處SPT之孔位，取平行孔進行DCPT現地試驗，並以SPT-N值及DCPT-Nd值等參數間之相關性作比較。
1. 由DCPT試驗結果，可初步判斷各孔位土層每10cm之強度變化情形，亦可初步判斷黏性土層與砂性土層之層面交界處。
2. 以SPT-N值為基準之土層強度變化趨勢比較DCPT-Nd值土層強度變化趨勢結果，除了在少數孔位因為現地環境改變或發生掏空現象等情況而有所差異，大致上都是符合的。且SPT-N值與DCPT-Nd值之相對關係，於砂質土壤經由線性迴歸後R2達0.88以上。
3. 由DCPT的貫入試驗值及現地土樣之基本物理性質，以DCPT-Nd值為依據之Seed簡易經驗法之液化分析流程進行分析。曾經發生土壤液化之孔位中，編號A01及A09其所在土層深度4.5m以內為易發生液化之土層，此與SPT分析結果及實際情形相符。

Standard Penetration Tests (SPT) and Cone Penetration Tests (CPT) are often performed to evaluate geotechnical engineering properties of soil and liquefaction potential of soil. In spite of certain advantages lied in both tests, they can not be conducted without the aids of large-scale instruments. To deal with such drawback, the current researchers developed a portable instrument to conduct the Dynamic Cone Penetration Test. Namely, the portable instrument, a convenient, time-saving, and economic in-site geotechnical testing, including cone penetrations and samplers can be applicable not only for in-situ SPT but also for continuous soil in CPT.
The current study, using 18 borehole positions of SPT in the urban areas of Tainan, was carried out an in-situ test from which horizontal holes were taken to perform DCPT. Correlations between the SPT-N value and DCPT-Nd value were further compared.
Firstly, based on the result of DCPT, it could be observed the strength variations in each 10 cm soil layer of each borehole position, and the inter-layer of clayey-soil and sandy-soil layer.
In addition, the result based on the comparison between soil strength variation of SPT-N value and DCPT-Nd value showed most of which were in conformity, but few borehole positions were discrepant to a certain degree due to the environmental change or foundation hollowing. Moreover, the relationship in sandy soil between value of SPT-N and DEPT-Nd was tested by liner regression resulting in an R2 value above 0.88.
Finally, the value of DCPT and the basic mechanical properties of the in-situ soil types were analyzed according to Seed’s (1985) liquefaction assessment chart. The depth of soil in 4.5 m for Code A01 and A09 was detected as the most frequently occurring soil layer of liquefaction. Such result conformed to that of SPT.

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