Numerical Analysis Method for Liquefaction-induced Damage Evaluation to Railway Structure

Kwon, Sun Yong; Yoo, Mintaek

doi:10.1007/s12205-022-1372-y

Cited by 1 publication

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“…Several previous studies employed a numerical approach to investigate the seismic behavior for the liquefiable soil condition of offshore structures such as breakwaters and pipelines [22,23]. Other studies performed numerical or experimental studies on earthquake behavior of embankments and identified that the widespread damage to such piles and embankments occurred mainly due to the liquefaction of foundation soil, resulting in excessive settlements, lateral spreading, and slope instability [24][25][26][27][28][29][30][31]. However, the key to the above studies was to investigate the seismic behavior of the embankments or other coastal structures, which was far from the reliquefaction behavior of embankment structures, which play an important role in securing the stability of major infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Reliquefaction Behavior of Coastal Embankment Due to Successive Earthquakes Based on Shaking Table Tests

Yoo

Kwon

2023

JMSE

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Liquefaction caused by long-term cyclic loads in loose saturated soil can lead to ground subsidence and superstructure failures. To address this issue, this study aimed to emulate the liquefaction phenomenon based on a shaking table test while especially focusing on the soil behavior mechanism due to the reliquefaction effect. Liquefaction and reliquefaction behaviors were analyzed by ground conditions where an embankment was located on the coastal ground. Silica sand was used for the experiment for various thickness and liquefiable conditions, and the embankment model was constructed above the model ground. For seismic waves, sine wave excitation was applied, and a total of five excitations (cases) were conducted. When the upper ground layer consisted of a non-liquefiable layer, liquefaction did not occur due to the first excitations but occurred by the third excitation. The results indicated that as the earthquake was applied, the water level in the liquefiable layer increased to the height of the non-liquefiable layer and liquefaction could occur. It was identified that even if liquefaction did not occur for the main earthquake, liquefaction could occur due to aftershocks caused by a rise in the groundwater level due to a series of earthquakes. In a general seismic design code, liquefaction assessment is performed only for soil layers below the groundwater level; however, when successive earthquakes occur, unexpected liquefaction damage could occur. Therefore, to mitigate the earthquake risk of liquefaction for coastal embankments, it is necessary to evaluate the liquefaction by aftershocks even when the groundwater level of the ground layer under an embankment is low.

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