## 1 Introduction
It was concluded that despite the relatively low magnitudes of the shocks, the occurrence of liquefaction was mainly associated with the presence of saturated alluvial soil deposits. These highly liquefiable soils were mainly located in the proximity of ancient river courses that were artificially diverted in the eighteenth century to mitigate flooding and other hydrological risks. [PERSON] et al. (2017) were able to generate a hazard map for the city of Chone in Ecuador for the evaluation of the probability of liquefaction using SPT data and indicated that the urban area of the city of Chone has a high probability of liquefaction, which was due to the presence of Holocene-aged soils developed in alluvial deposits, located in an alluvium mid catchment area. Following the 1989 Loma Prieta earthquake, [PERSON] and [PERSON] (2018) conducted a detailed analysis on the liquefaction risk for an industrial site near the Pajaro River at Watsonville, California. Based on the risk assessment, a ground improvement project by grouting was proposed to prevent lateral spreading in which a compaction grout test program was undertaken to validate and refine the project design. The Saemangeum Development Project (2018) is a national project that aims to build a global city and an industrial zone in Korea as a frontrunner of green growth. Due to the ongoing land reclamation projects and the need for coastal erosion protection, dikes and embankments are to be constructed. Since geosynthetic materials are easy to transfer and set up in the field (2018), geotextile tubes have been used as breakwaters, anti-erosion structures, and embankment reinforcement (2018; 2019; 2020), and can be an efficient and economical solution for slurry waste disposal (2018; 2020). Because Saemangeum is a reclaimed area, the upper ground layer consists mostly of silty sand, dredged from river estuaries around the coastal cities near Saemangeum. Silty sand's behavior can be complex as the amount of fines content could affect its liquefaction potential, as well as being highly susceptible to seepage effects. [PERSON] and [PERSON] (2018) studied the influence of silt size and nonplastic fines content on the liquefaction of a sand using the undrained triaxial compression test and concluded that mean grain diameter ratio affects the liquefaction potential of the sand. In some cases, when the mean grain diameter ratio is large, clean sand may be more liquefiable than silty sand, and in some cases when the mean grain diameter ratio is small, the increase of fine content may result in the silty sand being more liquefiable than clean sand. The study by [PERSON] and [PERSON] (2018) showed that the influence of fines content may be significantly affected by the nature of the fines. Hence, qualitative studies on Saemangeum silty sand during shaking and liquefaction could help provide better understanding on the systematic behavior of structures that are affected. The simplified method, which is calculated based on the maximum ground acceleration cannot fully predict the occurrence of liquefaction as the response of a system also depends on the period of shaking and frequency. In this study, a simple spring type shaking table apparatus is developed to investigate the seismic response of shallow foundations laid on an embankment that is reinforced by geotextile tubes, in which the embankment is composed of partially saturated soil that is highly susceptible to liquefaction and seepage effects. Numerous shaking table tests on the liquefaction of reduced scale models (2018; 2018; 2018) have been conducted in the past for the reason that measurements from shaking table tests are easier to obtain and that the behaviour of the soil leading to liquefaction can be investigated directly in real time. Through the apparatus, the seismic response of Saemangeum dredged soil can be investigated for various conditions or scenarios, considering time-dependent behavior.