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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geosynthetic Society
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Journal DOI :
Korean GeoSynthetics Society
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Volume & Issues
Volume 5, Issue 4 - Dec 2006
Volume 5, Issue 3 - Sep 2006
Volume 5, Issue 2 - Jun 2006
Volume 5, Issue 1 - Mar 2006
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A Case Study on the Improvements of Soft Ground Using PBD Method in Pusan New Port
Son, Jin-Hyun ; Kim, Ji-Yong ; Byun, Ki-Jun ; Lee, Byung-Gil ; You, Seung-Kyong ; Kim, Tae-Hyung ;
Journal of the Korean Geosynthetic Society, volume 5, issue 4, 2006, Pages 1~10
In This paper, the settlements of soft ground and the undrained shear strength were compared for verify the improvement effect of PBD method, completed in the Busan New Port phase 1-1 site. Through the describing of design cases with the PBD method, the effects of the improvement method with CPT data were evaluated comparing with measured results. We expect that the output from this research is useful in future for design and analysis when similar soft grounds are planned to be used.
Stability Behavior of Geotextile Tube Composite Structure by Slope Stability and 2-D Limit Equilibrium Analysis
Oh, Young-In ; Shin, Eun-Chul ; Kang, Jeong-Gu ;
Journal of the Korean Geosynthetic Society, volume 5, issue 4, 2006, Pages 11~18
Geotextile has been used for various types of containers, such as small hand-filled sandbags, 3-dimensional fabric forms for concrete paste, large soil and aggregate filled geotextile gabion, prefabricated hydraulically filled containers. They are hydraulically filled with dredged materials and have been applied in coastal protection and scour protection, dewatering method of slurry, temporary working platform for bridge construction, temporary embankment for spill way dam construction. Recently, geotextile tube technology is no longer alternative construction technique but suitable desired solution. The paper presents the stability behavior of geotextile tube composite structure by 2-D limit equilibrium and slope stability analysis. 2-D limit equilibrium analysis was performed to evaluate the stability of geotextile tube composite structure to the lateral earth pressure and also transient seepage and stability analysis were conducted to determine the pore pressure distribution by tide variation and slope stability. Based on the results of this paper, the three types of geotextile tube composite structure is stable and also slope stability of overall geotextile tube composite structures is stable with the variation of tidal conditions.
Characteristics of Shear Behavior for Sand-Clay Composite by Triaxial Test
Lee, Jin-Soo ; Kim, Jae-Il ; Lee, Kang-Il ;
Journal of the Korean Geosynthetic Society, volume 5, issue 4, 2006, Pages 19~25
To examine the general features of a sand-clay composite triaxial test by making specimen varying ratios of diameters (dw) of sand columns that are installed on the soft ground as drains to diameters (de) of drain zone so called drainage space ratio (n=de/dw), densities of the granular columns, and strength of soft soils round around. I also conducted a test to research the reinforcement ability and effects of the ground when the granular columns are wrapped with supplementary materials such as geotextile. The results of the triaxial compression test showed that the shear strength increase is much big when the granular columns are wrapped with supplementary materials, while the shear strength increases as the diameter and density of the granular column increase in general. Also the drainage space ratio shows a distinct increase just below 3 and a similar shear behavior to sand is appeared. The pore water pressure coefficient decreases as the drainage space ratio decreases, however, when the drainage space ratio is less than 3~4, it declines significantly as shown in the results of shear behavior.
Evaluation of Friction Properties between Geostrip/Sandpaper Interface
Lim, Ji-Hye ; Byun, Sung-Won ; Jeon, Han-Yong ;
Journal of the Korean Geosynthetic Society, volume 5, issue 4, 2006, Pages 27~33
Frictional properties between geostrip and sand paper interface were estimated considering soil particle size also the friction coefficients and angles were determined with normal stress. Three kinds of geostrips of design strength 50, 70, 100 KN/m were used and 5 sandpapers of P100, P220, P320, P400, P600 were used also. Shear strength between geostrip and sand paper interface with design strength showed big difference and this is due to the uniform surface pattern of each geostrip when contact to sandpaper without regard to design strength. Shear strength of geostrip was increased with design strength and geostrips/P100 sandpaper interface showed the biggest value. Finally, all of geostrips showed the decrease phenomena of post-peak strength and this is due to the abrasion of geostrip surface by shear test.
A Case Study on Behavior of High-Raised Reinforced Soil Wall
Cho, Sam-Deok ; Lee, Kwang-Wu ; Lee, Hoon-Yeon ; Chang, Ki-Soo ;
Journal of the Korean Geosynthetic Society, volume 5, issue 4, 2006, Pages 35~42
This paper describes a field experience on geogrid-reinforced soil walls rising up to 29.5m in height. Since experiences of design and construction on very high-raised geogrid reinforced soil wall were limited, thorough design and construction management was performed for safe construction of the wall. Regarding design of the wall, both internal and external stabilities were examined based on the design guideline specified by FHWA and overall slope stability analyses were performed by using Bishop simplified method. Moreover, a series of instrumentations were performed. The results of instrumentation for two tiered reinforced soil wall showed that not only the deformations of both the wall face and the reinforcement but also the horizontal earth pressures acting on the wall facing were very small. These results indicate that the reinforced soil wall technology can be applied successfully for high-raised tiered wall more than 20m heights and FHWA design guideline is very conservative for that large wall.
Installation Damage Assessment of Geogrids by Laboratory Tester
Jin, Yong-Bum ; Byun, Sung-Won ; Jeon, Han-Yong ;
Journal of the Korean Geosynthetic Society, volume 5, issue 4, 2006, Pages 43~47
Installation damage of 3 types of geogrids were evaluated with compaction condition. This experimental test was in accordance with ENV ISO 10722-1. Tensile strength of geogrids were decreased with number of cyclic compaction loading without regard to kind of filled material and it was seen that strength decrease tendency showed the dependence on geogrid type. Woven and warp-knitted type geogrids showed the bigger decrease of tensile strength than welded type geogrids.
Thinning Effect Due to Bentonite Migration on Performance of GCL
Choi, Hangseok ; Lee, Chulho ; Stark, Timothy D. ;
Journal of the Korean Geosynthetic Society, volume 5, issue 4, 2006, Pages 49~58
Recently, geosynthetic clay liners (GCLs) have increasingly been used to replace compacted clay liners (CCLs) in composite liner systems. Since the introduction of GCLs to waste containment facilities, one of the major concerns about their use has been the hydraulic equivalency to CCLs as required by regulations. Laboratory test results and more recently field observations show that the thickness, or mass per unit area, of hydrated bentonite in a GCL can decrease under normal stress, especially around zones of stress concentration or nonuniform stresses, such as a rock or roughness in the subgrade, a leachate sump, or wrinkles in an overlying geomembrane. This paper presents field case histories that confirm the laboratory observations of bentonite migration and the effect of bentonite migration on hydraulic equivalency and contaminant transport through a GCL.