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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 6, Issue 4 - Dec 2007
Volume 6, Issue 3 - Sep 2007
Volume 6, Issue 2 - Jun 2007
Volume 6, Issue 1 - Mar 2007
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Bearing Capacity of Soft Ground Reinfoced by Geosynthetics and Sand Mat
Ju, Jae-Woo ; Park, Jong-Beom ; Seo, Kyeh-Won ; Jang, Min-Ho ;
Journal of the Korean Geosynthetic Society, volume 6, issue 1, 2007, Pages 1~7
In order to improve the bearing capacity of soft ground for the purpose of getting a trafficability of construction vehicles, the geosynthetics-sandmat system has often been used. Yamanouchi had proposed the equation of calculating the bearing capacity about this kind of bearing mechanism, which has a soft ground-geosynthetics-sandmat system. The bearing capacity equation by Yamanouchi has been widely using in our country. However this equation includes an important contradictory concept because if the contact width of vehicles is incresed to reduce the contact pressure, the bearing capacity is decresed on the contray according to this equation. In order to investigate this contradictory concept, the bearing capacity test has been performed on the soft model ground with geosynthetics-sandmat system. From the test results about various kinds of models, the principle that explain the contradictory concept has been found and on the basis of this principle the new bering capacity equation has been proposed by modifying Yamanouchi equation.
Case History of Sea Dyke Filter Construction Using Geotextile Tube Mattress
Oh, Young-In ; Yoo, Jeon-Yong ; Kim, Hyun-Tae ;
Journal of the Korean Geosynthetic Society, volume 6, issue 1, 2007, Pages 9~16
Geotextile is one of the most useful and effective polymer material in civil construction works and the main function of geotextile is separation, reinforcement, filtering and drainage. Recently, because of the shortage of natural rock, traditional forms of river and coastal structures have become very expensive to build and maintain. Therefore, the materials used in hydraulic and coastal structures are changing from the traditional rubble and concrete systems to the cheaper materials and systems. One of these alternatives employs geotextile tube technology in the construction of coastal and shore protection structures, such as embankment, see dyke, groins, jetties, detached breakwaters and so on. Geotextile tube technology has changed from being an alternative construction technique and, in fact, has advanced to become the most effective solution of choice. This paper presents case history of sea dyke filter construction using geotextile tube mattress and also, various issues related to the tube mattress design and construction technology.
Finite Element Modeling of Geogrid-encased Stone Columns in Soft Clay
Yoo, Chung-Sik ; Song, Ah-Ran ; Lee, Dae-Young ; Kim, Sun-Bin ; Park, Si-Sam ;
Journal of the Korean Geosynthetic Society, volume 6, issue 1, 2007, Pages 17~25
This study presents a modeling approach for geogrid-encased stone column(GESC) method which is widely used in Europe as an alternative to conventional pile foundations. Several benefits of using the stone column method include sound performance, low cost, expediency of construction, and liquefaction resistance, among others. Recently, geosynthetic-encased stone column approach has been developed to improve load carrying capacity through increasing confinement effect. The aim of this research is to establish a systematic approach for modeling of GESC and to form a database for the fundamentals of GESC. This paper presents details of 3D modeling of GESC together with the general behavior of GESC.
Strength Evaluation of I-Type Connecting System on a Segmental Retaining Reinforced Wall Consideration the Backfill Settlement
Moon, Hee-Jung ; Han, Jung-Geun ; Lee, Jong-Young ; Cho, Sam-Deok ; Lee, Kwang-Wu ;
Journal of the Korean Geosynthetic Society, volume 6, issue 1, 2007, Pages 27~32
This paper describes the applicability of geogrid with I-type coupling system, which permits vertical displacement on back fill ground of the reinforced retaining wall and also minimize the damage between block and geogrid. The improvement of coupling method allowed the reduction of approximately 700 mm in the existing geogrid, and as a result, the tensile strength at the coupling joint showed approximately 53% of the maximum tensile strength. It is expected from the laboratory investigations that the coupling strength of geogrid with the combination of in-situ supporting material should be predominant in the field condition.
Drain Capacity of PVD Filter Considering the Field Condition
Han, Sung-Su ; Jeong, Kyeong-Han ;
Journal of the Korean Geosynthetic Society, volume 6, issue 1, 2007, Pages 33~38
PVD (Prefabricated Vertical drain) consists of filter and core. An effective PVD has two basic filtration functions ; first to retain soil particle ; and second, to allow water to pass from the soil into the PVD core without clogging or blinding. Clogging which reduces the permeability of the geotextile filter jacket is caused by fine particles penetrating into the geotextile filter jacket in relatively low permeability soil conditions. As clogging performance increases gradually, excess pore water flow from soil is resisted and finally consolidation delays. Current soil-geotextile filter system criteria are generally based on relationships between a representative pore size of the geotextile and particle size of the soil. In Korea, PVD geotextile filter system criteria have been applied by only testing AOS (Apparent Opening Size) of filters without evaluating the filtration and clogging performance on soil-geotexile filter systems. Therefore, the filtration tests on soil-geotexile filter systems were conducted in order to evaluate the filtration and clogging performance with 3 kinds of geotextile filters. On these tests, we have applied geotextile filter system criteria on PVD in
Optimization Analysis between Processing Parameters and Physical Properties of Geocomposites
Jeon, Han-Yong ; Kim, Joo-Yong ;
Journal of the Korean Geosynthetic Society, volume 6, issue 1, 2007, Pages 39~43
Geocomposites of needle punched and spunbonded nonwovens having the reinforcement and drainage functions were manufactured by use of thermal bonding method. The physical properties (e.g. tensile, tear and bursting strength, permittivity) of these multi-layered nonwovens were dependent on the processing parameters of temperatures, pressures, bonding periods etc. - in manufacturing by use of thermal bonding method. Therefore, it is very meaningful to optimize the processing parameters and physical properties of the geocomposites by thermal bonding method. In this study, an algorithm has been developed to optimize the process of the geocomposites using an artificial neural network (ANN). Geocomposites were employed to examine the effects of manufacturing methods on the analysis results and the neural network simulations have been applied to predict the changes of the nonwovens performances by varying the processing parameters.