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http://dx.doi.org/10.7843/kgs.2019.35.7.15

A Case Study on Earthquake-induced Deformation of Quay Wall and Backfill in Pohang by 2D-Effective Stress Analysis  

Kim, Seungjong (Dept. of Civil Engrg., Gyeongsang National Univ.)
Hwang, Woong-Ki (Geotechnical Research & Development Co., Ltd.)
Kim, Tae-Hyung (Dept. of Civil Engrg., Korea Maritime and Ocean Univ.)
Kang, Gi-Chun (Dept. of Civil Engrg., Gyeongsang National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.35, no.7, 2019 , pp. 15-27 More about this Journal
Abstract
The purpose of this study is to investigate the mechanism about damages occurring at quay wall and backfill in Youngilman Port during Pohang earthquake (M5.4) on November 15, 2017. In the field investigation, the horizontal displacement of the caisson occurred between 5 cm and 15 cm, and the settlement at backfill occurred higher than 10 cm. 2D-effective Stress Analysis was performed to clarify the mechanism for the damage. The input earthquake motion used acceleration ($3.25m/s^2$) measured at bedrock of Pohang habor. Based on a numerical analysis, it was found that the effective stress decreased due to the increase of excess pore pressure in the backfill ground and the horizontal displacement of the caisson occurred by about 14 cm, and the settlement occurred by about 3 cm. In backfill, the settlements occurred between 6 cm and 9 cm. This is similar to field investigation results. Also, it was found that the backfill soil was close to the Mohr-Coulomb failure line due to the cyclic loading from the effective stress path and the stress-strain behavior. It may be related to decreasing of bearing capacity induced by the reduction of effective stress caused by the increase of the excess pore water pressure.
Keywords
Earthquake; Liquefaction; Excess pore water pressure; Effective stress; FLIP;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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