本研究使用動力三軸系統，試驗土樣為臺灣彰化近海鑽探取得之土樣，針對海床土壤中之砂質土壤，設計三組細粒料含量（15%、30%與50%）、三種孔隙比（0.7、0.8與0.9）及四種飽和度（15%、30%、60%與100%）以濕夯法架設重模試體，於三個有效圍壓（20 kPa、80 kPa與320 kPa）下進行應變控制試驗，探討上述影響因子對於土壤動態剪力模數與阻尼比特性之影響，最後再與共振柱試驗結果相擬合，獲得海床土壤完整的動態特性曲線。由試驗結果顯示，海床土壤之正規化剪力模數隨應變增加而衰減趨勢較少，大致落在Seed和Idriss (1970)建議上界，阻尼比變化趨勢則偏建議範圍下界；孔隙比、飽和度、有效圍壓及細粒料含量皆會影響剪力模數與阻尼比，其中細粒料含量較無其他因子影響顯著。而有效圍壓增加、飽和度提升、孔隙比上升及細粒料含量下降，皆會使完整正規化剪力模數衰減曲線右移；增加有效圍壓、降低細粒料含量，完整阻尼比曲線也會呈現右移趨勢。

This research conducts the dynamic triaxial test using the soil samples extracted from offshore near Changhua. For sandy soils in seabed soils, reconstituted specimens were designed based on fines content (15%, 30%, and 50%), void ratio (0.7, 0.8, and 0.9) and saturation (15%, 30%, 60%, and 100%) using the moist tamping technique. The dynamic triaxial tests were performed at three confining stress levels (20, 80, and 320 kPa) under displacement-controlled condition. This research investigates the influence of the above-mentioned factors on the properties of the dynamic shear modulus and damping ratio of soil. To obtain complete dynamic property curves of seabed soils, normalized shear modulus reduction curves and damping ratio curves from dynamic triaxial tests and resonance column tests were combined. According to the test results, normalized shear modulus reduction curves are roughly at the upper boundary of Seed and Idriss’s (1970) suggested range, while the damping ratio curves trend are towards the lower boundary of the suggested range. Void ratio, saturation, effective confining pressure, and fines content all affect the shear modulus and damping ratio, with fines content having a less significant effect. The increase in effective confining pressure, saturation, and porosity, and the decrease in fines content will move the complete shear modulus reduction curves to the right side. By increasing the effective confining pressure and decreasing the fines content, the complete damping ratio curves also show the rightward shift.

1. Anderson, D.G., “Dynamic Modulus of Cohesive Soils,” Thesis Presented to the University of Michigan, in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy, pp. 311, 1974.
2. ASTM, “Standard Test Methods for the Determination of the Modulus and Damping Properties of Soils Using the Cyclic Triaxial Apparatus,” ASTM International Standard Methods, Vol. 91, No. Reapproved, pp. 1–16, 2013.
3. Atkinson, J.H., and Sallfors, G., “Experimental Determination of Soil Properties,” Proceedings of the 10th European Conference on Soil
Mechanics, Florence, Vol. 3, pp. 915–956, 1991.
4. Barros, J.M.C., “Factors Affecting Dynamic Properties of Soils,” Ph.D. Thesis, University of Michigan, 1994.
5. Das, B. M., Advanced Soil Mechanics, Taylor and Francis, Philadelphia, 1997.
6. El Mohtar, C.S., Drnevich, V.P., Santagata, M., and Bobet, A., “Combined Resonant Column and Cyclic Triaxial Tests for Measuring Undrained Shear Modulus Reduction of Sand with Plastic Fines,” Geotechnical Testing Journal, Vol. 36, No. 4, pp. 1–9, 2013.
7. GDS, “The GDS 2Hz/5Hz/10Hz Dynamic Testing System Hardware Handbook,” GDS Instruments Ltd., pp. 1–30, 2006.
8. GDS, “The GDS Standard Controller/Smart Keypad Firmware Revision STDDPCv2,” GDS Instruments Ltd., pp. 4, 2006.
9. Ghayoomi, M., Suprunenko, G., and Mirshekari, M., “Cyclic Triaxial Test to Measure Strain-Dependent Shear Modulus of Unsaturated Sand,” International Journal of Geomechanics, Vol. 17, No. 9, pp. 1–11, 2017.
10. Gu, X., Yang, J., Huang, M., and Gao, G., “Bender Element Tests in Dry and Saturated Sand: Signal Interpretation and Result Comparison,” Soils and Foundations, Elsevier, Vol. 55, No. 5, pp. 951–962, 2015.
11. Hardin, B., and Black, W., “Vibration Modulus of Normally Consolidated Clay,” Journal of Soil Mechanics and Foundations Division, Vol. 94, No. SM2, pp. 353–369, 1968.
12. Hardin, B.O., and Drnevich, V.P., “Shear Modulus and Damping in Soils: Measurement and Parameter Effects,” Journal of Soil Mechanics and Foundations Division, Vol. 98, No. SM6, pp. 603–624, 1972a.
13. Hardin, B.O., and Drnevich, V.P., “Shear Modulus and Damping in Soils: Design Equations and Curves,” Journal of Soil Mechanics and Foundations Division, Vol. 98, No. SM7, pp. 667–692, 1972b.
14. Hardin, B.O., “The Nature of Stress-Strain Behavior for Soils,” Proceedings of the Geotechnical Division Specialty Conference on Earthquake Engineering and Soil Dynamics, Pasadena, California, Vol. 1, pp. 3–90, 1978.
15. Iwasaki, T., and Tatsuoka, F., “Effects of Grain Size and Grading on Dynamic Shear Moduli of Sands,” Soils and Foundations, Vol. 17, No. 3, pp. 19–35, 1977.
16. Iwasaki, T., Tatsuoka, F., and Takagi, Y., “Shear Moduli of Sands under Cyclic Torsional Shear Loading,” Soils and Foundations, Vol. 18, No. 1, pp. 39–56, 1978.
17. Khan, Z., El Naggar, M.H., and Cascante, G., “Frequency Dependent Dynamic Properties from Resonant Column and Cyclic Triaxial Tests,” Journal of the Franklin Institute, Elsevier, Vol. 348, No. 7, pp. 1363–1376, 2011.
18. Kramer, S.L., Geotechnical Earthquake Engineering, Prentice-Hall Inc., New Jersey, 1996.
19. Kokusho, T., “Cyclic Triaxial Test of Dynamic Soil Properties for Wide Strain Range,” Soils and Foundations, Vol. 20, No. 2, pp. 45–60, 1980.
20. Kuribayashi, E., Iwasaki, T., and Tatsuoka, F., “Effects of Stress-Strain Conditions on Dynamic Properties of Sands,” Proceedings of the Japan Society of Civil Engineers, No. 242, pp. 105–114, 1975.
21. Leong, E.C., and Cheng, Z.Y., “Effects of Confining Pressure and Degree of Saturation on Wave Velocities of Soils,” International Journal of Geomechanics, Vol. 16, No. 6, pp. 1–10, 2016.
22. Likitlersuang, S., Teachavorasinskun, S., Surarak, C., Oh, E., and Balasubramaniam, A., “Small Strain Stiffness and Stiffness Degradation Curve of Bangkok Clays,” Soils and Foundations, Elsevier, Vol. 53, No. 4, pp. 498–509, 2013.
23. Madhusudhan, B.N., and Kumar, J., “Damping of Sands for Varying Saturation,” Journal of Geotechnical and Geoenvironmental Engineering, Vol. 139, No. 9, pp. 1625–1630, 2013.
24. Ramberg, W., and Osgood, W.R., “Description of Stress–Strain Curves by Three Parameters,” Technical Note No. 902, National Advisory Committee for Aeronautics, Washington DC., 1943.
25. Ray, R.P., and Woods, R.D., “Modulus and Damping Due to Uniform and Variable Cyclic Loading,” Journal of Geotechnical Engineering, Vol. 114, No. 8, pp. 861–876, 1988.
26. Seed, H.B., and Lee, K.L., “Liquefaction of Saturated Sands during Cyclic Loading,” Journal of Soil Mechanics and Foundations Division., Vol. 92, No. SM6, pp. 105–134, 1966.
27. Seed, H.B., and Idriss, I.M., “Soil Moduli and Damping Factors for Dynamic Response Analyses,” Report No. EERC 70-10, Earthquake Engineering Research Center, University of California, Berkeley, 1970.
28. Seed, H.B., Wong, R.T., Idriss, I.M., and Tokimatsu, K., “Moduli and Damping Factors for Dynamic Analyses of Cohesionless Soils,” Journal of Geotechnical Engineering, Vol. 112, No. 11, pp. 1016–1032, 1986.
29. SW-AJA, “Soil Behavior Under Earthquake Loading Conditions, State of the Art Evaluation of Soil Characteristics for Seismic Response Analyses: Prepared Under Subcontract,” No.3354, Union Carbide Corp., for U.S. Atomic Energy Commission, Contract No. W-7405-eng-26, 1972.
30. Silver, M.L., “Load, Deformation and Strength Behavior of Soils under Dynamic Loadings,” Proceedings of 1st International conference on Recent Advances in Geotechnical Earthquake Engineering and soil Dynamics, pp. 873–895, 1981.
31. Thevanayagam, S., Fiorillo, M., and Liang, J., “Effect of Non-Plastic Fines on Undrained Cyclic Strength of Silty Sands,” Soil Dynamics and Liquefaction 2000, pp. 77–91, 2000.
32. Ueng, T., Lin, M., Li, I., Chu, C., and Lin, J., “Dynamic Characteristics of Soils in Yuan‐Lin Liquefaction Area,” Journal of the Chinese Institute of Engineers, Vol. 25, No. 5, pp. 555–565, 2002.
33. Vucetic, M., “Cyclic Threshold Shear Strains in Soils,” Journal of Geotechnical Engineering, Vol. 120, No. 12, pp. 2208–2228, 1994.
34. Vucetic, M., and Dobry, R., “Effect of Soil Plasticity on Cyclic Response,” Journal of Geotechnical Engineering, Vol. 117, No. 1, pp. 89–107, 1991.
35. Wu, S., Gray, D.H., and Richart, F.E., “Capillary Effects on Dynamic Modulus of Sands and Silts,” Journal of Geotechnical Engineering, Vol. 110, No. 9, pp. 1188–1203, 1984.
36. Youn, J.U., Choo, Y.W., and Kim, D.S., “Measurement of Small-Strain Shear Modulus Gmax of Dry and Saturated Sands by Bender Element, Resonant Column, and Torsional Shear Tests,” Canadian Geotechnical Journal, Vol. 45, No. 10, pp. 1426–1438, 2008.
37. Zehtab, K.H., Gokyer, S., Apostolov, A., Marr, W.A., and Werden, S.K., “Experimental Study of Strain Dependent Shear Modulus of Ottawa Sand,” Geotechnical Earthquake Engineering and Soil Dynamics V, Reston, VA, pp. 257–266, 2018.
38. Zhang, J., Andrus, R.D., and Juang, C.H., “Normalized Shear Modulus and Material Damping Ratio Relationships,” Journal of Geotechnical and Geoenvironmental Engineering, Vol. 131, No. 4, pp. 453–464, 2005.
39. 王金山，「共振柱試驗之土壤動力性質」，碩士論文，國立中央大學土木工程研究所，中壢，2004。
40. 王偉芯，「台灣彰化近海土壤動態性質試驗研究」，碩士論文，國立成功大學土木工程研究所，臺南，2017。
41. 李咸亨、李建中、沈國瑞、林少思，「臺北盆地黏性土壤之動態剪力模數和阻尼比」，中國土木水利工程學刊，第二卷，第二期，第135–147頁，1990。
42. 李政融，「動力三軸試驗探討含細料粉質砂土之動態行為」，碩士論文，國立成功大學土木工程研究所，臺南，2010。
43. 李偉榮，「細料含量對飽和粉質砂土動態行為影響之研究」，碩士論文，國立成功大學土木工程研究所，臺南，2010。
44. 李豐博、李延恭、陳圭璋、謝明志、簡連貴、蘇吉立、李春榮、陳志芳、陳義松、張阿平，「土壤動態性質研究」，交通部運輸研究所港灣技術研究中心，研（五），1986。
45. 林保延，「利用彎曲元件試驗推估砂土動態性質之探討」，碩士論文，國立臺灣科技大學營建工程研究所，臺北，2005。
46. 林華悌，「粉質砂土阻尼比模式之探討」，碩士論文，國立成功大學土木工程研究所，臺南，2012。
47. 施慶煌，「低塑性粉質砂土之原狀與重模試體動態性質之探討」，碩士論文，國立成功大學土木工程研究所，臺南，2009。
48. 紀佳妤，「應用共振柱試驗探討海床土壤動態特性之研究」，未出版碩士論文，國立成功大學土木工程研究所，臺南，2020。
49. 高茂森，「土壤動態三軸試驗條件對液化潛能分析之影響」，碩士論文，國立成功大學土木工程研究所，臺南，2004。
50. 郭毓真，「細粒料含量對麥寮砂動態行為之影響」，碩士論文，國立交通大學土木工程研究所，新竹，2004。
51. 陳志瑋，「細料含量對乾粉質砂土動態行為影響之研究」，碩士論文，國立成功大學土木工程研究所，臺南，2010。
52. 游家豪，「低塑性細料對粉質砂土動態性質之影響」，碩士論文，國立成功大學土木工程研究所，臺南，2007。
53. 黃安斌，「台灣中西部粉/砂土壤液化行為之研究心得」，地工技術雜誌，第121期，pp. 5–16，2009。
54. 黃耀道，「台灣中西部粉土質砂土液化行為分析」，博士論文，國立交通大學土木工程研究所，新竹，2007。
55. 葉兆欽，「飽和度對粉質砂土動態特性影響之研究」，碩士論文，國立成功大學土木工程研究所，臺南，2011。
56. 鄭鈺諠，「不飽和夯實土壤之動態性質」，碩士論文，國立中央大學土木工程研究所，中壢，2010。
57. 鍾育明，「動力三軸試驗程式之研究」，碩士論文，國立成功大學土木工程研究所，臺南，2007。
58. 簡才貴，「土石壩材料之動態性質」，碩士論文，國立中央大學土木工程研究所，中壢，2006。