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http://dx.doi.org/10.12814/jkgss.2022.21.4.069

A Study on Stress-Strain Behaviour of Geotube Structure Filled with Silty Sand Under Low Confining Pressure by Triaxial Compression Test  

Hyeong-Joo, Kim (Department of Civil Engineering, Kunsan National University)
Tae-Woong, Park (Renewable Energy Research Institute, Kunsan National University)
Ki-Hong, Kim (Department of Civil & Environment Engineering, Kunsan National University)
Publication Information
Journal of the Korean Geosynthetics Society / v.21, no.4, 2022 , pp. 69-78 More about this Journal
Abstract
Geotextile tubes are widely used to prevent erosion in coastal areas and to replace the backfill for shore slopes in the reclamation of land using dredged soil. In this study, The triaxial confining pressures were chosen as 10kPa, 50kPa, or 100kPa for the specimens reinforced with geotextile considering the condition in the site. The strain behavior under various compressive stresses was then identified. At strains 0% to 7%, the stress-strain behavior was the same due to the effect of initial strain hardening, in which the force was exerted according to the relaxation of the geotextile regardless of the confining pressure (≤100kPa). At strains of 7% or more, the specimen with the small confining pressure had smaller deformation under load, which increases the tensile resistance provided by the reinforcing geotextile. Brittle fracture was then observed due to strain softening and the deviator stress abruptly decreased. This is different from the phenomenon in which the shear strength increases as the confining pressure increases in general triaxial compression tests. In the geoxtile-confined tests, geotextiles are primarily subjected to tensile displacement. Thereafter, the modulus of elasticity increases rapidly, which exhibits the elastic behavior of the geotextile.
Keywords
Liquid dredging soils; Triaxial compression test; Geotube; Low confining pressure; Strain hardening;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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