다층 지오텍스타일 튜브 구조물의 변위분석

Recently, utilization of the geotextile structure is being increased as a structure for protecting beach line and as also a structure for using temporary dike. The mechanical behaviors of stacked geotextile tubes are very complex and they are involved in the properties of the filling material, geotextile, and foundation soil. This study analyzed the displacement behavior of geotextile tube structure which was constructed in Incheon Bridge construction site. It is included that a measurement of tube structure settlement, and it is compared with the result of numerical analysis. The displacement and tensile strength of constructed tube indicated that the largest value was occurred at the surface of circumferential direction. The vertical pressure is contributed to equivalent pressure in the 1st layer, however, when the upper load is increased, the pressure was concentrated on the center of tube structure and then it induces the differential settlement on the ground. The total settlement on the top of stacked geotextile tube occurred about 1.8m from the ground level. As a result of analyzing, the stacked geotextile tube structure is safe in terms of the external and internal stability. However, it has to be considered the reduction of height caused by the settlement of filling material, scouring of the ground by velocity of tidal level, losing of fine material by flow of water. It is confirmed that the similar behavior was observed through the numerical analysis by FLAC for stacked geotextile tube.