Myoung-Soo Won

Finite-Element Analysis on the Stability of Geotextile Tube–Reinforced Embankments under Scouring

AbstractScouring is a significant problem on river bank and coastal protection systems. Severe scouring can cause damaging consequences to geotextile tube embankment structures. In this study, five case scenarios of an embankment system supported by stacked geotextile tubes were analyzed using a commercially available finite-element analysis software. These case scenarios include (1) conventional geotextile tube stacking on ground base foundation; (2) geotextile tube stacking on gravel bedding foundation; (3) geotextile tube stacking on excavated foundation; (4) geotextile tube stacking on excavated foundation with gravel bedding; and (5) fortification of stacked geotextile tubes by riprap protection. Each case scenario is simulated under normal loading and critical loading conditions with and without scouring at the base toe of the embankment system. Results suggest that the potential problems that occur during scouring and critical states of the embankment system instigate failures that could destabiliz...

Model Tests on Dredged Soil–Filled Geocontainers Used as Containment Dikes for the Saemangeum Reclamation Project in South Korea

AbstractA geotextile tube is a type of geocontainer typically filled with sandy slurries and fine-grained dredged sediments. Its performance in strength, dewatering, fine-particle retention, and stacked stability has been studied extensively. However, very little is understood about the shape-deformation behavior of geotextile tubes. In this paper, slurry-settlement, constant head permeability, and seepage-force tests were conducted to determine the geocontainers’ geotechnical design parameters. The characteristics of the dredged fill material determined from the slurry-settlement, constant head permeability, and seepage-force tests are presented. Large-scale tests on model geotextile tubes were also conducted. A large-scale apparatus for geotextile tube–filling test simulation is introduced. The apparatus consists of a slurry mixing station, a pumping and delivery station, a geotextile tube–filling station, and a data station. The results of the model tests conducted on a transparent geobag (undrained co...

A Study on the Deformation Behavior of Laboratory Geosynthetics Reinforced Soil Walls

Direct shear tests, wide-width tensile tests, and laboratory geosynthetics reinforced soil (GRS) wall tests were performed to examine and understand the external deformation behavior characteristics of GRS walls respectively constructed with non-woven geotextile (NWGT) and geogrid as reinforcement material. The result of laboratory GRS walls tests showed that the external displacement of the wall with geogrid, which had more stiffness than NWGT, appeared to be smaller than the wall with NWGT during both under construction and in the beginning of the loading, but the wall with geogrid showed larger displacements than the wall with NWGT as the load is increasing. The interface shear stress at the initial shear strain appeared to be higher at the soil-geogrid interface than at the soil-NWGT interface, but quite different phenomena in interface shear stress with increasing shear strain. It could be concluded that the NWGT would be a reasonable reinforcement of the wall under limited allowable deformations.