本研究利用現地所取回之不擾動土樣進行一系列動力三軸試驗，用以探討現地土壤之液化強度與震陷特性。不擾動土樣包含薄管土樣與塊狀土樣兩種，以粉質砂土為主。此外，本文亦蒐集其他本土砂土之液化強度資料並與本研究試驗結果比較，發現砂土的液化強度範圍約SR20≒0.17~0.31。
本研究利用再壓密試驗結果探討現有三種液化後震陷評估法之關係圖表，並各依其程序探討集集地震所引致地盤沈陷之案例，以期工程界在選擇評估法時有所助益。

In this paper, a series of undisturbed samples were carried out in a sandy deposit at central Taiwan. Laboratory physical tests and cyclic traxial tests were then conducted to obtain the basic properties, volumetric strain and cyclic resistance. The in-site samplings consisted of tube sampling during boring and block sampling in a pit. Besides, the others cyclic resistance of in-site undisturbed samples also was collected and compared with the outcome of this study. It was found that the scope of the cyclic resistance(SR20) of in-site sandy soil ranges between 0.17 and 0.31.
To investigate related charts suggested by three methods about estimation of earthquake-induced settlements in saturated sand deposits, the volumetric strain obtained from re-consolidation test would be analyzed with relative density and the maximum shear strain. These test data and conclusions may provide a valuable base for seismic design in a foundation soil with sandy soils.

1. Tokimatsu, K., and Seed, H.B., “Evaluation of settlements in sands due to earthquake shaking,” Journal of Geotechnical Engineering Division, Vol. 113, No. GT8, pp. 861-878(1987).
2. Ishihara, K., and Yoshimine, M., “Evaluation of settlements in sand deposits following liquefaction during earthquake,” Soils and Foundations, Vol. 32, No. 1, pp. 173-188(1992).
3. Shamoto, Y., Sato, M., and Zhang, J., “Simplified estimation of earthquake-induced settlements in saturated sand deposits,” Soils and Foundations, Vol. 36, No. 1, pp. 39-50(1996).
4. Shamoto, Y., and Sato, M., “Evaluation of liquefaction-induced settlements in sand deposits,” Proceedings, Symposium on Deformation Behavor of Soil Deposits under Cyclic Loading, JSSMFE, pp. 15-18(1990).
5. Isihara, K., “Liquefaction and flow during earthquakes,” Geotectnique, Vol. 43, No. 3, pp. 351-415(1993).
6. Seed, H.B., and Idriss, I.M., “Simplified procedure for evaluating soil liquefaction potential,” Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 97, No. SM9, pp. 1249-1274(1971).
7. Nagase, H., and Ishihara, K., “Liquefaction-induced compaction and settlement of sand during earthquakes,” Soils and Foundations, Vol. 28, No. 1, pp. 65-76(1988).
8. Glaser, S.D., “Estimation of surface displacements due to earthquake excitation of saturated sands,” Earthquake Spectra, Vol. 10, No. 3, pp. 489-517(1994).
9. Seed, H.B., “Soil liquefaction and cyclic mobility evaluation for level ground during earthquake,” Journal of the Geotechnical Engineering Division, ASCE, Vol. 105, No. GT2, pp. 201-255(1979).
10. Tokimatsu, K., and Yoshimi, Y., “Empirical correlation of soil liquefaction based on SPT N-value and fines content,” Soils and Foundations, Vol. 23, No. 4, pp. 56-74(1983).
11. Dobry, R., “Some basic aspects of soil liquefaction during earthquakes,” Earthquake Hazards and the Design of Constructed Facilities in the Eastern United States, Vol. 558, pp. 172-182(1989).
12. De Alba, P., Chan, C.K., and Seed, H.B., “Determination of soil liquefaction characteristics by large-scale laboratory tests,” EERC Report 75-14, Earthquake Engineering Research Center, Universityt of California, Berkeley, CA(1975).
13. Silver, M.L., and Seed, H.B., “Volume changes in sand during cyclic loading,” Journal of Geotechnical Engineering Division, ASCE, Vol. 97, No. 9, pp. 1171-1182(1971).
14. Lee, K., and Albraisa, A., “Earthquake-induced settlements in saturated sands,” Journal of Geotechnical Engineering, ASCE, Vol. 100, No. GT4, pp. 387-405(1974).
15. Ishihara, K., and Watanabe, T., “Sand liquefaction through volume decrease potential,” Soils and Foundations, vol. 16, No. 4, pp. 61-70(1976).
16. Yoshimi, Y., Kuwabara, F., and Tokimatsu, K., “One-dimensional volume change characteristics of sands under very low confining stresses,” Soils and Foundations, Vol. 15, No. 3, pp. 51-60(1975).
17. Vaid, Y.P., Chen, J.C., and Tumi, H., “Confining pressure, grain angularity, and liquefaction,” Journal of Geotechnical Engineering, ASCE, Vol. 111, No. 3, pp. 1229-1235(1985).
18. Seed, H.B., and Lee, K.L., “Liquefaction of saturated sands during cyclic loading,” Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 92, No SM6, pp. 105-134(1966).
19. Yoshimi, Y., Tokimatsu, K., Kaneko, O., and Makihora, Y., “Undrained cyclic shear strength of a dense Niigate sand,” Soils and Foundations, Vol. 24, No. 4, pp. 131-145(1984).
20. Kokusho, T., “Cyclic triaxial test of dynamic soil properties for wide strain range,” Soils and Foundations, Japanese Society of Soil Mechanics and Foundation Engineering, Vol. 20, pp. 45-60(1980).
21. Castro, G., and Poulos, S.J., “Factors affecting liquefaction and cyclic mobility,” Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 103, No GT6, pp.501-516(1977).
22. Ladd, R.S., “Specimen preparation and liquefaction of sands,” Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 100, No. GT10, pp. 1180-1184(1974).
23. 黃俊鴻、李崇正、黃富國，「新化斷層與南二高交會處之土壤液化評估與防治建議」，交通部國道新建工程局研究報告(1998)。
24. 黃俊鴻、陳正興，「土壤液化評估規範之回顧與前瞻」，地工技術，第70期，第23-44頁(1998)。
25. 黃俊鴻、楊志文、譚志豪、陳正興，「集集地震土壤液化之調查與分析」，地工技術，第77期，第51-64頁(2000)。
26. 亞新工程顧問股份有限公司，「土壤液化評估與處理對策研擬第一期計畫(彰化縣員林鎮、大村鄉及社頭鄉)期初報告」，行政院國家科學委員會委託，(1999)。
27. 林資凱，「水力回填煤灰之動態特性」，碩士論文，國立中央大學土木工程研究所，中壢(2001)。
28. 萬鼎工程服務股份有限公司，「麥寮六輕石化工業區大地工程綜合評估顧問工作(Ⅰ、Ⅱ、Ⅲ)總結報告書」，(1999)。
29. 國立中央大學，「雲林離島工業區水力回填土壤之液化實驗報告」，國立台灣大學委託，中壢(1997)。
30. 黃俊鴻、楊志文，「以集集地震案例探討本土液化評估方法之適用性」，2002集集地震液化工程問題研討會論文集，第51-60頁(2002)。
31. 吳偉特、楊騰方，「細料含量在不同程度影響因素中對台灣地區沈積性砂土液化特性之研究」，土木水力季刊，第十四卷，第三期，第59-74頁(1987)。