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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 7, Issue 4 - Dec 2008
Volume 7, Issue 3 - Sep 2008
Volume 7, Issue 2 - Jun 2008
Volume 7, Issue 1 - Mar 2008
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Numerical Analysis of Soil Vapour Extraction Remediation System using Prefabricated Vertical Drain
Shin, Eun-Chul ; Park, Jeong-Jun ; Lee, Kyu-Woong ;
Journal of the Korean Geosynthetic Society, volume 7, issue 4, 2008, Pages 1~8
Soil vapor extraction (SVE) is an effective and cost efficient method of removing volatile organic compounds (VOCs) and petroleum hydrocarbons from unsaturated soils. However, soil vapor extraction becomes ineffective in soils with low gas permeability, for example soils with air permeabilities less than 1 Darcy. The aim of this study is to investigate numerically the performance of a prefabricated vertical drain (PVD) as a SVE well, and the pattern of the induced air flow. A validated numerical model for a single PVD extraction well is developed based on the result of a well-designed laboratory model test. The validity of the simple analytical approach to determine air permeability based on the results of model tests is also discussed.
A Study of Stability Analysis on Unsaturated Soil Slopes Considering Rainfall
Kim, Khi-Woong ; Kim, Bum-Joo ; Park, Jeong-Jun ;
Journal of the Korean Geosynthetic Society, volume 7, issue 4, 2008, Pages 9~18
Shallow slope failures in residual soil during periods of prolonged infiltration are common in Korea. This study examines an infinite slope analysis to estimate the influence of infiltration on surficial stability of slopes by the limit equilibrium method. Approximate method which is based on the Green-Ampt model have been considered to evaluate the likelihood of shallow slope failure which is induced by a particular rainfall event that accounts for the rainfall intensity and duration for various return periods. Pradel & Raad method which is devised to predict the depth of wetting front to decomposed granite soil slopes having measured soil-water characteristic curves. To compare the results with those obtained from the Pradel & Raad method, a series of numerical analysis using SEEP/W were carried out. It was found that the stability analysis of unsaturated soils calculated by using the soil-water characteristic curve of decomposed granite soils was found to be a proper analysis for shallow slope failures due to rainfall.
New Developing the Porous Geocell and Researches on its Properties
Yuu, Jung-Jo ; Oh, Young-In ;
Journal of the Korean Geosynthetic Society, volume 7, issue 4, 2008, Pages 19~23
This paper summarized that the developing Geocell(Geocomb
) cellular confinement system with a porous strip and the researches on its properties. The new geoell has shown excellent properties; frictional and permeable characteristics, and is expected to be a proper solution to various fields related.
Load Carrying Capacity of Geogrid-Encased Stone Columns in Soft Ground
Yoo, Chung-Sik ; Kim, Sun-Bin ;
Journal of the Korean Geosynthetic Society, volume 7, issue 4, 2008, Pages 25~36
This paper presents the results of numerical investigation on support mechanism of geogrid-encased stone columns for use in soft ground. A number of cases were analyzed using a axial-and 3D stress-pore pressure coupled model that can effectively model construction sequence and drainage as well as reinforcing effects of geogrid-encased stone columns. The results indicated that the geogrid encasement tends to significantly improve the load carrying of a stone column. Also revealed was that such a confinement effect depends on encasement length and stiffness of geogrid. It is also shown that there exist critical encasement length and stiffness of geogrid for a given condition.
Soil Improvement using Vertical Natural Fiber Drains
Kim, Ju-Hyong ; Cho, Sam-Deok ;
Journal of the Korean Geosynthetic Society, volume 7, issue 4, 2008, Pages 37~45
A pilot test using environmentally friendly drains, was carried out to evaluate their applicability potential in the field. The pilot test site was divided into 5 different areas, with several combinations of vertical and horizontal drains installed for evaluation. Conventional natural fiber drains (FDB), new developed straw drain board (SDB) and plastic drain board (PDB) were used as vertical drains, while sand and fiber mats were used as horizontal drains. Surface settlement rates and excess pore pressure generation/dissipation tendency of PDB and FDB are almost identical except those of SDB. Cone tip resistance obtained from cone penetration test measured at the end of 1st consolidation stage for upper soft layer definitely increased irrespective of types of vertical drains. The monitoring and site investigation test data obtained at the pilot test site prove the vertical natural fiber drains can be used as substitutes of conventional plastic and sand material.
Suggestion of the Specific Infiltration Equation for Infiltration Trench Installed in a Granular Ground
Nam, Jung-Man ; Yun, Jung-Mann ; Kim, Do-Hyeong ;
Journal of the Korean Geosynthetic Society, volume 7, issue 4, 2008, Pages 47~55
The model test and field test for an infiltration trench were carried out to estimate the infiltration quantity in a granular ground with high permeability like Jeju's ground. The specific infiltration equation was suggested on the basis of the model test result. It shows that the infiltration quantity by the proposed equation is larger than about two times of that by the existed equation. Meanwhile, the infiltration quantity from field test is similar to that from the proposed equation as the result of comparison between infiltration quantity of the filed test and that of the proposed equation and the existed equation. Therefore, it may be right that the proposed equation is applied to estimate the infiltration quantity of the infiltration trench in a granular ground with high permeability.