| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 88 === The purpose of this thesis is to research the results of some common analysis methods on liquefaction cases caused by 921 Chi-Chi Earthquake, 1999, and also review the degree of suitability and difference of these liquefaction potential analysis methods with these liquefaction cases. These results can be the reference of liquefaction potential analysis methods suitable for Taiwan. We also analysis liquefaction cases caused by 1022 Jia-Yi Earthquake, 1999.
In this thesis, the liquefaction sites of 921 Chi-Chi Earthquake we analyzed are: Jingongliao and Jengshin Li in Nantou City; Huangtsuo Village (in Datsun) ,Meigang Village (in Datsun), Lunya Li (in Yuanlin Town), Shanhu Village (in Shetou) in Zhanghua County. Besides, the site of Jinliao Village in Houbi, Tainan County is cused by 1022 Jia-Yi Earthquake. The liquefaction sites analyzed all have geological boring reports, and was taken an undisturbed soil specimen from each site to proceed the cyclic triaxial test and resonant column test.. We also cited the geological boring reports from the National Center for Research on Earthquake Engineering. The liquefaction potential analysis methods we used are: Seed''s method, Iwasaki''s method (Japan Road Association Approach), New method suggested by Japan Road Association, Tokimatsu and Yoshimi''s method, Chinese method (Chinese Building Codes), Arias intensity method, shear wave velocity method, and cyclic triaxial test method.
We conclude the results: Nantou City is very near to the epicenter of Chi-Chi Earthquake, and the PGA is large to 0.428g, therefore the liquefaction potential derived from all the analysis methods is very high. Because the fines content of all the liquefaction sites are high, the Seed''s method will over-estimation the liquefaction potential. Iwasaki''s method, New method suggested by Japan Road Association, and Tokimatsu and Yoshimi''s method are under-estimation the liquefaction potentials of most cases in Zhanghua region. We infer that it may be caused by the high content of silt, and high content of silt may also cause high liquefaction potential. Most the analysis methods do not consider the contribution of silt content to liquefaction resistance. Arias intensity method is based on the view of energy. Because Arias intensity method do not consider the characteristics of soil profiles, it is not reasonable that some non-liquefaction cases are estimated as liquefiable.
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