| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 91 === The soil in Maoluo River area of Nantou City was used in this study with the soil passing sieve #400 (0.038 mm) as the fines. The specimens were prepared by moist tamping to a dry density of 1400 kg/m3 for different fines contents. Dynamic triaxial tests were conducted to obtain the liquefaction resistance of specimens with different fines contents. The results were compared with these obtain by Chen (2002) who defined the fines as the soil particles passing sieve #200 (0.074 mm). The effect of definition of fines on the liquefaction evaluation was studied based on the comparison.
When the soil is loose with a dry density of 1400 kg/m3, the result of dynamic tests show that there is a minimum strength for the soil with a fines content at around 20%. The liquefaction resistance of the samples with a fines content of 100% is approximately 1.4 times of that of the soil with a fines content of 20%.
The results of the dynamic tests indicate that the definition of the fines has an influence on the liquefaction resistance of the soil in Maoluo River area. Both this research and the study by Chen, show that it appeals a minimum dynamic strength of the soil specimens with a fines content of around 20%. However, the liquefaction resistances of these soils with this fines content are different. The differences are even more pronounced between the liquefaction resistances of these two soils with higher fines contents. That is, the fines contents have a greater effect on the liquefaction resistance of the soil when the fines is defined with sieve #400.
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