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침투수압이 작용된 Hanging Bag 시험에 의한 토목섬유 튜브 구조체의 압밀해석에 관한 연구
김형주,피터 레이 디노이,박태웅,문성길,김형수,장르 한국복합신소재구조학회 2017 복합신소재구조학회 학술발표회 Vol.2017 No.04
Geotextile tubes are excellent design strategies for both shoreline protection and dewatering of fine materials. A difficulty with regard to designing geotextile tubes is the matching of the appropriate fabric with the site-specific infilled material and the unavailability of a test to determine the soil-geotextile consolidation properties. Existing methods simulate and predict the final tube shape based on the initial and final unit weights of the infill but the time required to reach the final shape or the compatibility of the infill are not being considered. This study proposes an improved hanging bag test to evaluate the compatibility of an infill with the geotextile fabric, and at the same time, to obtain the soil-geotextile consolidation properties. With the obtained consolidation properties, a big prototype simulation was possible, explaining the deformation behavior of the tube in the field. An analytical procedure used in modeling the tube was coupled with the large strain consolidation theory to simulate the filling and dewatering process.
토목섬유 투수 성능이 튜브 구조체 형성에 미치는 영향에 관한 실험적 연구
김형주,박태웅,김형수,피터 레이 디노이,유지호 한국복합신소재구조학회 2018 복합신소재구조학회 학술발표회 Vol.2018 No.04
In this study, a drainage-regulated type geotextile tube structure was proposed. The structure is composed of high permeability polypropylene(PP) and low permeability (PET) fabric in which the lengths of the fabric depend on the circumference ratio of the cross section. The purpose is to reduce the pressure inside the geotextile tube structure during filling as much as possible. Experimental study on the characteristics of the geotextile tube structure according to the permeability of the geotextile was also carried out. Experimental results of 4 small scaled geotextile tube structures showed that the bottom section formed as drainage type can reduce the filling pressure as well as increase the sedimentation height which confirms as the optimum cross section of the tube.
김형주,박태웅,김형수,피터 레이 디노이,유지호 한국복합신소재구조학회 2018 복합신소재구조학회 학술발표회 Vol.2018 No.04
In this study, several tests such as liquid limit test, compaction test, and XRF analysis were conducted on silty sand (SM) containing air to investigate the saturation collapse phenomenon due to flow liquefaction, which can result to the increase of the saturation degree and water content. The relationship between the flow strength and water content of the test material, which was artificially prepared by mixing Saemangeum dredged soil and water at different mixing ratios, was investigated to determine the strength variation caused by intergranular flow. When silicon dioxide (Si02) and water react with each other, energy is generated from capillary phenomenon and the attractive force between particles increases from 10% to 20% due to matric potential. The maximum flow resistance is maintained at the range of 20% to 30% water content, which is larger than the optimum water content obtained from the compaction test, so that flow resistance is greater in the region where the maximum shearing force is significantly high. However, if the water content is increased to more than 30%, the flow resistance is significantly low.