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Suwon Son
Seismic Simulation Test Center, Pusan National University, Busan 46241, Korea

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Journal article
Published: 09 August 2021 in Applied Sciences
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Underground cavities can develop below structures, leading to ground settlement and hindering the development of urban infrastructure. Soil flow protectors (SFPs) have been developed to prevent and alleviate problems due to the formation of such cavities. In this study, we performed scaled model experiments to develop a design method for an SFP with an adequate safety factor under different installation lengths of its upper and lower parts in sandy ground. The installation of the SFP reduced the average surface settlement ratio to the range of 0.44–0.72, thus demonstrating its effectiveness in reducing ground settlement. In addition, we proposed a relational equation for determining the optimal length ratio of the SFP and the settlement ratio. An analysis of the influencing factors showed that the lower part of the SFP influenced the settlement reduction, whereas the upper part influenced the stability of the SFP depending on the ground settlement ratio. Finally, we have proposed an optimal length equation for the SFP and presented a flowchart for the design method. The results of this study can serve as a design basis for the efficient construction of infrastructure.

ACS Style

Suwon Son; Moonbong Choi; Jaewon Yoo. Stability Analysis of Soil Flow Protector and Design Method for Estimating Optimal Length. Applied Sciences 2021, 11, 7314 .

AMA Style

Suwon Son, Moonbong Choi, Jaewon Yoo. Stability Analysis of Soil Flow Protector and Design Method for Estimating Optimal Length. Applied Sciences. 2021; 11 (16):7314.

Chicago/Turabian Style

Suwon Son; Moonbong Choi; Jaewon Yoo. 2021. "Stability Analysis of Soil Flow Protector and Design Method for Estimating Optimal Length." Applied Sciences 11, no. 16: 7314.

Journal article
Published: 01 May 2020 in Sustainability
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Settlement of a relatively small magnitude occurs in box structures supported by pile foundations. However, if cavities are generated under the box structure, ground settlement can be accelerated by surrounding soil entering the cavities. In order for the structure to maintain stability for a long period of time, sustainable development to maintain the stability of the building must be continued. Preventing rapid ground settlement can lead to long-term structural stability and prevent the occurrence of life-threatening damage, thereby helping to maintain and build a sustainable urban infrastructure. Thus, in this study, a soil flow protector (SFP) that can be easily installed on the sides of the structure was developed to mitigate the aforementioned problem. Field tests and numerical analysis were performed to investigate the effect of SFP installation on structural stability and settlement reduction. After performing field experiments, it was found that SFP installation could reduce ground settlement and ground horizontal displacement. Moreover, for a 79.9-mm settlement, the safety factor was 1.315, which remained stable even when the settlement reached 345 mm. Hence, the developed SFP can be used to reduce soft ground settlement affecting box structures supported by pile foundations.

ACS Style

Jaewon Yoo; Suwon Son; Sangtae Kim. Development and Performance Analysis of Soil Flow Protector to Reduce Soft Soil Settlement Caused by Cavity Formation. Sustainability 2020, 12, 3641 .

AMA Style

Jaewon Yoo, Suwon Son, Sangtae Kim. Development and Performance Analysis of Soil Flow Protector to Reduce Soft Soil Settlement Caused by Cavity Formation. Sustainability. 2020; 12 (9):3641.

Chicago/Turabian Style

Jaewon Yoo; Suwon Son; Sangtae Kim. 2020. "Development and Performance Analysis of Soil Flow Protector to Reduce Soft Soil Settlement Caused by Cavity Formation." Sustainability 12, no. 9: 3641.

Journal article
Published: 17 January 2020 in Journal of Marine Science and Engineering
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Global warming is becoming worse owing to carbon dioxide emissions around the world, and eco-friendly energy for reducing carbon dioxide emissions is gaining importance. Wind power plants are the most representative of the environmentally friendly energy power plants built in the ocean. The fatigue loading and long-term dynamic behavior of offshore soils are important considerations in the construction of structures such as wind turbines in the ocean as they are subject to long-term loads such as wind and wave loads. A design graph presents the short- and long-term behaviors of soil. Several laboratory tests are typically conducted to create design graphs. In this study, a cyclic simple shear test conducted at various confining pressures and relative densities is presented in design graphs. The authors analyzed the sensitivity of the relative density and the confining pressure, and proposed a drawing technique to easily create two-dimensional design graphs. The authors found that the effect of the relative density on the design failure curve was higher compared with that of the confining pressure. The elliptic equation graph achieved the best match to the design failure curve, and the design failure curve drawing technique was summarized in five stages. In addition, the normalized cyclic stress ratio graph to distinguish safety or failure was presented.

ACS Style

Su-Won Son; Jong-Chan Yoon; Jin-Man Kim. Simplified Method for Defining 2-Dimensional Design Failure Curve of Marine Silty Sand under Dynamic Loading. Journal of Marine Science and Engineering 2020, 8, 51 .

AMA Style

Su-Won Son, Jong-Chan Yoon, Jin-Man Kim. Simplified Method for Defining 2-Dimensional Design Failure Curve of Marine Silty Sand under Dynamic Loading. Journal of Marine Science and Engineering. 2020; 8 (1):51.

Chicago/Turabian Style

Su-Won Son; Jong-Chan Yoon; Jin-Man Kim. 2020. "Simplified Method for Defining 2-Dimensional Design Failure Curve of Marine Silty Sand under Dynamic Loading." Journal of Marine Science and Engineering 8, no. 1: 51.

Journal article
Published: 29 May 2019 in Applied Sciences
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Retaining walls are generally used for temporary installations during the excavation process of a construction project. They are also utilized to construct embankments in order to extend a railway facility. In this case, a retaining wall is installed during the construction process and contributes to the resistance of large amounts of stress, including the railway load. However, it is generally difficult to retain walls to maintain their stability. Therefore, alternative construction methods, such as the use of an inclined earth-retaining wall, have been utilized to suppress the lateral displacement. The stability is verified in advance through field tests; however, the maximum stress acting on the railway is thought to be the concentrated railway load. In this study, a two-dimensional numerical analysis was conducted by changing the railway load to a dynamic load. The analysis was applied according to the number of H-piles of the same length (10 m) when only the front wall was installed and when a back support was also applied. It was determined that the lateral displacement of the latter case is smaller than that of the former, whereas the resistance to dynamic loading of the former case is greater.

ACS Style

Su-Won Son; Minsu Seo; Jong-Chul Im; Jae-Won Yoo. Dynamic Numerical Analysis of Displacement Restraining Effect of Inclined Earth-Retaining Structure during Embankment Construction. Applied Sciences 2019, 9, 2213 .

AMA Style

Su-Won Son, Minsu Seo, Jong-Chul Im, Jae-Won Yoo. Dynamic Numerical Analysis of Displacement Restraining Effect of Inclined Earth-Retaining Structure during Embankment Construction. Applied Sciences. 2019; 9 (11):2213.

Chicago/Turabian Style

Su-Won Son; Minsu Seo; Jong-Chul Im; Jae-Won Yoo. 2019. "Dynamic Numerical Analysis of Displacement Restraining Effect of Inclined Earth-Retaining Structure during Embankment Construction." Applied Sciences 9, no. 11: 2213.

Journal article
Published: 15 May 2019 in Sustainability
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The improvement of soft clay and dredged soils to carry structures is increasingly important. In this study, the dynamic behavior of a crushed stone foundation wall in clay soil was analyzed using a 1g shaking table test. The response accelerations and spectra for three input ground motions were analyzed relative to the distance from the foundation wall, confirming that the acceleration was damped from the outside. The acceleration according to the distance from the wall was not significant under long-period motions, while different responses were obtained under short-period motions. The increased ground stiffness provided by the crushed stone wall lowered the natural period of the ground, and the acceleration amplification under short-period seismic waves was larger than that under long-period waves. Finally, equations were derived to describe the relationship between the acceleration amplification ratio and distance from the wall. The slopes of the proposed equations are larger under shorter periods, implying that the change in acceleration change with distance from the wall is more significant under shorter periods. The results of this study can be used to inform the design of soft soil improvements and the structures built atop them.

ACS Style

Su-Won Son; Pouyan Bagheri; Jin-Man Kim. Dynamic Behavior of Ground Improved Using a Crushed Stone Foundation Wall. Sustainability 2019, 11, 2767 .

AMA Style

Su-Won Son, Pouyan Bagheri, Jin-Man Kim. Dynamic Behavior of Ground Improved Using a Crushed Stone Foundation Wall. Sustainability. 2019; 11 (10):2767.

Chicago/Turabian Style

Su-Won Son; Pouyan Bagheri; Jin-Man Kim. 2019. "Dynamic Behavior of Ground Improved Using a Crushed Stone Foundation Wall." Sustainability 11, no. 10: 2767.