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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geosynthetic Society
Journal Basic Information
Journal DOI :
Korean GeoSynthetics Society
Editor in Chief :
Volume & Issues
Volume 2, Issue 3 - Sep 2003
Volume 2, Issue 2 - Jun 2003
Volume 2, Issue 1 - Mar 2003
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Friction Features of Geosynthetics Through the Pullout Test
Shin, Eun-Chul ; Yun, Sock-Ho ;
Journal of the Korean Geosynthetic Society, volume 2, issue 1, 2003, Pages 3~13
Recently, construction of the reinforced earth structures, which adopts reinforcing materials of geosynthetic, is rapidly increasing due to its good economic advantages, beautiful appearance, and convenient construction. Nonetheless, the most important factor of interpretation and design of the reinforced earth structures, which is assessment ways of friction features between earth and geosynthetic, has not been standardized yet. It has great difference of interpretation and design methods which suggested to the design engineer. This study is to present the way how to assess more reasonably friction features between geogrid and weathered granite soil through the pullout test. Based on a large-scale pullout test of geogrid, the maximum shear stress, interface fricton angle, and friction efficiency are presented with consideration of various test condition.
Measured Behavior of Full-Scale Soil-Reinforced Segmental Retaining Wall
Yoo, Chung-Sik ; Jung, Hyuk-Sang ;
Journal of the Korean Geosynthetic Society, volume 2, issue 1, 2003, Pages 15~25
This paper presents the results of instrumentation of a two-level of soil-reinforced segmental retaining wall. Instrumentation items include the lateral wall displacements and the geogrid strains at several locations. The instrumentation is still long carried in order to examine long-term behavior. The result indicate that the upper wall has a significant effect on the behavior of the lower wall doubling the wall moved. The wall also exhibits significant post-construction movements that had ceased several months after the wall completed. The implication of the findings from this study was discussed in great detail.
Friction Properties between Fiber-Mixed Soil and Geogrid
Cho, Sam-Deok ; Lee, Kwang-Wu ; An, Ju-Hwan ;
Journal of the Korean Geosynthetic Society, volume 2, issue 1, 2003, Pages 27~37
The factors affecting shear strength and friction characteristics of the fiber-mixed soil can be classified into engineering properties of soil; particle-size, distribution, and particle shape, physical and mechanical properties of fiber; shape, length, diameter, tensile strength, elastic modulus, friction coefficient, and mixed ratio and external factors; confined stress and compaction condition. In this study, a series of shear friction tests and pull-out tests were performed to evaluate the friction properties of fiber-mixed soil according to soil type, fiber type, fiber mixed ratio and compaction degree. The materials and test conditions used in this study are as follows. Soils: SM and ML; mixing fibers: three types of polypropylene fibers(net type 38mm and 60mm, and line type 60mm); reinforcement: geogrid; mixing ratio: 0.2% and 0.3%; degree of compaction : 85% and 95%.
Friction Characteristics on Interface Between Reinforcement and Sand by Direct Shear Test Methods
Ju, Jae-Woo ; Park, Jong-Beom ; Chang, Yong-Chai ;
Journal of the Korean Geosynthetic Society, volume 2, issue 1, 2003, Pages 39~45
The most important part in the earth reinforcement is the interface between soil and the reinforcement. Shear strength and shear behavior in this interface make a great role relating to the reinforcement effect. This paper presents 2 kinds of direct shear test methods. one is the strain free shear test, called 'free method', that is performed by the free condition of allowing tensile strain. The other is the strain fix shear test, called 'fixed method', that is performed by the fixed condition of not allowing tensile strain. Two reinforcements were used such as nonwoven geotextile and geogrid. That is, interfaces are composed of geogrid/sand and geotextile/sand. From the test results it shows us that the fixed method had a greater friction angle and a smaller peak shear strain than those of the free method. Residual stress of the fixed method was bigger than that of the free method but the residual stress ratio was vice versa.
Assessments of Hydraulic Properties of Geotextiles with Fiber Composition Factors
Jeon, Han-Yong ; Chung, Jin-Gyo ; Chang, Yong-Chai ;
Journal of the Korean Geosynthetic Society, volume 2, issue 1, 2003, Pages 47~55
The effects of fiber composition factors of 14 geotextiles which are thickness, porosity, fiber length and diameter etc. on the transmissivity were examined and in-plane permeability of geotextiles under thickness change, transmissivity, confined load were analyzed by the constitutive equations. And the effects of laminar structure on the permittivity of laminar geotextile composites which were manufactured with fiber packing densities were assessed. Transmissivities were increased with thickness of geotextiles and in-plane permeability coefficients were increased with porosity and fiber diameter. The effects of porosity were decreased with normal stress and slightly increased with fiber length. Transmissivities were increased with fiber diameter and showed same tendensy for the same fiber length. Permittivities of laminar geotextile composites were influenced by the waterhead loss in the inner interface and the connection shape of these composites to water path was interpreted as bell mouth type or soft flux pipe type.
Development of Strain-softening Modeling for Interfaces between Geosynthetics
Seo, Min-Woo ; Park, Jun-Boum ; Park, Inn-Joon ; Cho, Nam-Jun ;
Journal of the Korean Geosynthetic Society, volume 2, issue 1, 2003, Pages 57~68
Strain-softening model is developed to characterize the interface behavior of geomembrane with geotextile and geosynthetic clay liner(GCL). The model proposed in this research is calibrated by using data from direct shear tests conducted on smooth and textured geomembrane. The research is divided into two regions, pre-peak and post-peak, to take into account of strain-softening effect. Although slight difference between measured and back calculated data is observed under high normal stress, good agreements, in general, are found from back calculations. Especially, good consistency is observed in the case of low normal stress. Based on the results, it can be concluded that the proposed model can be a reasonable constitutive law to figure out the behavior of strain-softening between interfaces of geomembrane. In addition, DSC(Disturbed State Concept) model is also presented for further application in geosynthetic interfaces.