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http://dx.doi.org/10.7843/kgs.2018.34.8.37

Investigation of Pohang Earthquake Liquefaction Using 1D Effective-Stress Site Response Analysis  

Ahn, Jae-Kwang (Earthquake and Volcano Research Division, KMA)
Baek, Woo-Hyun (Dept. of Civil & Architecture Engrg., Seokyung Univ.)
Choi, Jae-Soon (Dept. of Civil & Architecture Engrg., Seokyung Univ.)
Kwak, Dong Youp (Dept. of Civil and Environmental Engrg., Hanyang Univ., ERICA)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.8, 2018 , pp. 37-49 More about this Journal
Abstract
Since the observation of ground motions in South Korea, liquefaction manifestation was the first to be observed in Pohang earthquake in 2017 with $M_L$ 5.4. Because liquefaction causes ground settlement and lateral spread damaging in-ground or super structures, various researchers have been analyzing the Pohang liquefaction case history to better understand and predict liquefaction consequence and to prevent future disasters. In prior research at the 2018 EESK conference, a map of Liquefaction Potential Index (LPI), indicating the severity of liquefaction, in Pohang was created and compared with damage observations. The LPI correlated well with the observations, but the severity categorized by LPI range was significantly higher than the actual observations in most regions. The prior LPI map was created evaluating ground motions using the simplified approach. In this research, we perform the effective site response analyses with porewater pressure generation model for the detailed evaluation of liquefaction on the liquefied sites in Pohang. We found that the simplified approach for LPI evaluation can overestimate the severity.
Keywords
Liquefaction; LPI; Liquefaction potential index; CSR-N curve; Site response;
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Times Cited By KSCI : 2  (Citation Analysis)
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