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http://dx.doi.org/10.7843/kgs.2020.36.2.5

Analysis of the Effect of the Revised Ground Amplification Factor on the Macro Liquefaction Assessment Method  

Baek, Woo-Hyun (Dept. of Construction System Engrg., Seoul National Univ. of Science & Technology)
Choi, Jae-Soon (Dept. of Civil & Architecture Engrg., Seokyeong Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.36, no.2, 2020 , pp. 5-15 More about this Journal
Abstract
The liquefaction phenomenon that occurred during the Pohang earthquake (ML=5.4) brought new awareness to the people about the risk of liquefaction caused by the earthquake. Liquefaction hazard maps with 2 km grid made in 2014 used more than 100,000 borehole data for the whole country, and regions without soil investigation data were produced using interpolation. In the mapping of macro liquefaction hazard for the whole country, the site amplification effect and the ground water level 0 m were considered. Recently, the Ministry of Public Administration and Security (2018) published a new site classification method and amplification coefficient of the common standard for seismic design. Therefore, it is necessary to rewrite the liquefaction hazard map reflecting the revised amplification coefficient. In this study, the results of site classification according to the average shear wave velocity in soils before and after revision were compared in the whole country. Also, liquefaction assessment results were compared in Gangseo-gu, Busan. At this time, two ground accelerations corresponding to the 500 and 1,000 years of return period and two ground water table, 5 m for the average condition and 0 m the extreme condition were applied. In the drawing of liquefaction hazard map, a 500 m grid was applied to secure a resolution higher than the previous 2 km grid. As a result, the ground conditions that were classified as SC and SD grounds based on the existing site classification standard were reclassified as S2, S3, and S4 through the revised site classification standard. Also, the result of the Liquefaction assessments with a return period of 500 years and 1,000 years resulted in a relatively overestimation of the LPI applied with the ground amplification factor before revision. And the results of this study have a great influence on the liquefaction assessment, which is the basis of the creation of the regional liquefaction hazard map using the amplification factor.
Keywords
Liquefaction hazard map; Liquefaction potential index; Macro liquefaction assessment; Site amplification; Soil classification;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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