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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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Korean GeoSynthetics Society
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Volume & Issues
Volume 8, Issue 4 - Dec 2009
Volume 8, Issue 3 - Sep 2009
Volume 8, Issue 2 - Jun 2009
Volume 8, Issue 1 - Mar 2009
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Simplified Method for the Determination of Cumulative Landslide Displacement in the Event of an Earthquake using "Slide Block" Type Analyses
Bae, Yoon-Shin ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 1~10
Earthquake induced landslides have caused tens of thousands of deaths and billions of dollars of damage during the last century alone. Determining the potential seismic hazard presented by statically stable slopes is essential for the evaluation of substantial landslide movement during an earthquake. Newmark's method for estimating landslide displacement under dynamic loading was presented and applied to two case studies. A simplified energy-based method was then be developed to estimate the Newmark's displacement.
Comparative Study of LEM and SSR-FEM on Stability of Reinforced Soil Slope
Kim, Young-Min ; Kang, Seong-Gwi ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 11~18
This paper presents a comparative study of reinforced soil slope by using LEM and SSR-FEM. Current analysis methods for reinforced soil wall are based on LEM. SSR-FEM assumes a reduction of soil strength by a factor to reach a critical state prior to failure based on continuum mechanics. In this study the comparisons are concerned with the factor of safety and the potential failure surface in reinforced soil wall. We investigated the stability of the reinforced soil wall with a slope of
by LEM and SSR-FEM. The comparisons indicated good performance of the SSR-FEM on stability analysis of reinforce soil wall.
Numerical Analyses on Consolidation Promotion Effect of Soft Clay Ground by Prefabricated Vertical Drain
You, Seung-Kyong ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 19~24
In this paper, a series of numerical analyses on soft clay ground improved by PVD were carried out, in order to investigate the consolidation promotion effect considering PVD width and surcharge pressure. In the numerical analyses, an elasto-viscoplastic three-dimensional consolidation finite element method was applied, in which the applicability of numerical analyses could be confirmed comparing with consolidation behavior simulated at the laboratory. And, through the results of the numerical analyses, consolidation behaviors of soft clay ground with elapsed time was elucidated, together with the effects of PVD width and surcharge pressure.
Liquifaction Characteristics of Saemangeum Dredged Sand Depending on Relative Density
Kim, Yoo-Seong ; Seo, Se-Gwan ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 25~32
In reclaimed loose sandy layer with dredged soil, liquefaction by the small scale earthquake coud be occurred easily. A study has been carried out to investigate the Liquefaction characteristic on Saemangeum dredged sandy soil, and compared with other results from the literature investigation. A series of undrained cyclic triaxial compression tests were performed on dredged sandy soil of Seamangeum area. The tests were performed at the three different initial relative densities(namely 30%, 50%, 70%), different cyclic stress ratio and different consolidation stress condition. The results of this study showed that cyclic stresses (
) increased linearly with increase of consolidation ratio, but the stress ratios (
) were almost same. The stress ratios were increased almost linearly with increase of relative density. Compared with other sandy soil, Saemangeum dredged sandy soil showed relatively weak liquifaction characteristics.
Study of Ground Reinforced Effect using the Porous Geocell
Shin, Eun-Chul ; Kim, Sung-Hwan ; Kim, Young-Jin ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 33~40
The laboratory tests and field plate load test were carried out to evaluate the reinforcement effect of geocell for road construction. The geocell-reinforced subgrade shows the increment of cohesion and friction angle with comparison of non-reinforced subgrade. In addition, the field plate load test was performed on the geocell-reinforced subgrade to estimate the bearing capacity of soil. The direct shear test was conducted with utilizing a large-scale shear box to evaluate the internal soil friction angle with geocell reinforcement. The number of cells in the geocell system is varied to investigate the effect of soil reinforcement. The theoretical bearing capacity of subgrade soil with and without geocell reinforcement was estimated by using the soil internal friction angle. The field plate load tests were also conducted to estimate the bearing capacity with geocell reinforcement. It is found out that the bearing capacity of geocell-reinforced subgrade gives 2 times higher value than that of unreinforced subgrade soil. The settlement and the distribution of deformation were also estimated by using the finite element method. The magnitude of settlements on the geocell-reinforced subgrade and unreinforced subgrade are 6.8cm and 1.2cm, respectively.
Design Considerations for Tied Back Soil Landslide Suppressor Walls
Bae, Yoon-Shin ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 41~51
This paper reviews many of the design considerations surrounding the topic of tiedback landslide suppressor walls primarily for soils app1ications. The design requires combining knowledge of many aspects of soil mechanics and geology to obtain a design a wall that fits site specific conditions. Many of the aspects necessary to complete the design are stil1 not comprehensively studied or understood. This paper provides an overview of the more traditional aspects of tieback wall design and a discussion of newer issues such as suppressor wall earth pressures and rotation of stresses due to tiebacks. An overview is also provided regarding the effect of seismic forces.
Geotechnical Characteristics of Frost-Susceptibility Soil Using Modified Freeze-Thaw Apparatus
Shin, Eun-Chul ; Ryu, Byung-Hyun ; Park, Jeong-Jun ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 53~59
A new system of modified freeze-thaw testing apparatus is introduced. This system is developed to evaluate the geotechnical parameters and their dependence upon freezing-thawing history of frost-susceptibility soil. A necessary condition for stationary frost heaving is clarified in this paper. The method changes the thermal boundary condition up to the net heat flow at the freezing frost becomes zero. The effectiveness of this method is verified by freeze-thaw tests. Frost heaving observed after the application of the method is found to be due to another frost heaving action called long-term frost heaving. This frost heaving has already been studied and is considered ignorable as engineering factor because of its small heaving amount.
A Case Study on Application of Dewatering Method for Slope Stability
Han, Jung-Geun ; Shin, Ju-Oek ; Hong, Ki-Kwon ; Jung, Sun-Kuk ; Lee, Yang-Kyu ; Kim, Byung-Soo ;
Journal of the Korean Geosynthetic Society, volume 8, issue 1, 2009, Pages 61~66
This paper presented that the causes on failure of reinforced slope are analyzed which based on the analyzed result. It had been applied that a method of lowering the groundwater using deepwell for sump. For the stability analysis on applied method, a series of numerical analysis were carried out. Therefore, it could be confirmed that slope stability was affected the dewatering ability of groundwater by the rainfall and this method which was confirmed very reasonable and suitable methods for slope stability, during heavy rainfall, in field.