Suitability Study of Simplified SPT-N Value Evaluation Methods of Soil Liquefaction in Tainan Area

  • 李 志宏

Student thesis: Doctoral Thesis

Abstract

The objective of this article is to compare the difference among seven simplified SPT-N value evaluation methods of soil liquefaction and also to assess the suitability of these methods in Tainan area The following are these seven simplified SPT-N value evaluation methods: HBF (2012) NCEER (2001) AIJ (2001) T&Y (1983) JRA (2012) JRA (1990) and CBC (2010) Besides in JRA (2012) the difference between whether D_50 and D_10 are considered or not Type I Earthquake and Type II Earthquake and in NCEER (2001) the difference between formulas and hand-painted diagrams in Seed’s simplified evaluation method will also be presented in this article There are totally 653 soil profiles have been used in this article to perform studies stated above To avoid mistaking two JRA methods from different years JRA (1990) will go by “Iwasaki” and JRA (2012) will go by “JRA” The results implies that values and distribution of liquefaction potential index(P_L) established by Iwasaki (1984) of HBF NCEER JRA and T&Y are similar and more conservative Compared with AIJ Iwasaki and CBC the percentage and distribution of high potential borehole of these four methods are much more and more widespread; the highest percentage is JRA up to 82 2% When it comes to error HBF-based with other methods on the part of average T&Y is the nearest NCEER is the next and the other methods differ a lot from HBF In Tainan area it seems no significant difference between whether D_50 and D_10 are considered in JRA; also the result of using Type I Earthquake is much more conservative than Type II Earthquake and the difference is up to 71% in average In view of percentage of number of boreholes of high liquefaction risk among liquefied cases or low liquefaction risk among non-liquefied cases suitability of HBF and JRA are better while AIJ Iwasaki and CBC are worse However compared with experience from Iwasaki et al (1984) the entire result of analysis is not very good Key words: 2016 Meinong Earthquake SPT soil liquefaction liquefaction potential survey liquefaction potential index
Date of Award2019
Original languageEnglish
SupervisorSheng-Huoo Ni (Supervisor)

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