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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 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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The Analysis of Bearing Capacity Behavior of Strip Footing on Geogrid-Reinforced Sand over a Soft Clay by Numerical Method
Kim, Young-Min ; Kang, Seong-Gwi ;
Journal of the Korean Geosynthetic Society, volume 8, issue 3, 2009, Pages 1~7
Earth reinforcement by using geogrids as reinforcing materials are widely applied to several earth structures. The bearing capacity of geogrid reinforced foundation soils is usually examined on based on the rigid plasticity theory or Limit Equilibrium Method. Method of analysis such Limit Equilibrium Method provide no detail information about failure behaviour or strain which develop in the reinforcement or foundation. In this paper the analysis of failure behaviour of strip footing on geogrid-reinforced sand over a soft caly was investigated by using a numerical method. A series of finite element analyses were performed on a geogrid-reinforced strip footing over a soft clay including number of geogrid layers, length, depth. We effectively investigated the failure behaviour and improvement of bearing capacity on the reinforced foundation soil by using FEM program.
Numerical Analysis on Behaviors of Very Soft Ground Improved by Geotextile
Ahn, Dong-Han ; You, Seung-Kyong ;
Journal of the Korean Geosynthetic Society, volume 8, issue 3, 2009, Pages 9~16
In generally, ground surface strengthening such as using geotextile is needed to secure trafficability of construction equipment. Several calculation methods for bearing capacity for very soft ground improved by geotextile have been proposed already but they are not established yet. In this paper, elastoplastic finite element analysis is carried out to estimate bearing capacity improvement for very soft ground reinforced by geotextile. In conclusion, by reinforcing with geotextile the bearing capacity improvement of very soft ground is increased with the increase of the settlement after yielding. And it is enough that the length of geotextile is about 3~4 times of the loaded width for the effect to the bearing capacity improvement. Finally, the biggest tensile force of geotextile occurs at an edge of the uniform load.
Study on Characteristics of Numerical Analysis Method for Stability Analysis of Reinforced Slope
Kim, Joon-Seok ; Kim, Ju-Yong ;
Journal of the Korean Geosynthetic Society, volume 8, issue 3, 2009, Pages 17~23
Conventional methods of reinforced slope analysis based on the concept of limit equilibrium have been widely adopted mainly due to their simplicity and short computation time. But depending upon the assumptions on the inter-slice forces, the factor of safety resulting from the limit equilibrium method is not uniquely determined. This paper describes a method to calculate the factor of safely of a slope using a numerical analysis. Recently some useful analysis techniques (Strength reduction method and the stability method using stress fields) by numerical analysis are proposed and their theory and characteristics applications are studied and investigated with simple examples in this paper.
Shear Strength Evaluation of Composite Colluvial Soil
Lee, Kang-Il ; Kang, Jun-Ho ; Kim, Tae-Hoon ;
Journal of the Korean Geosynthetic Society, volume 8, issue 3, 2009, Pages 25~34
Determination of design parameters of composite ground including colluvial soil layer is far difficult because the maximum particle size of such a soil is remarkably large and particle distribution may vary from area to area. The stress-strain behavior of colluvial soils is in fact dependent upon the engineering characteristics at the boundary between coarse and fine materials. However, strength parameters are in general determined based on the characteristics of fine material, which causes an underestimation of such parameters. In this study, strength parameters of colluvial soil are evaluated by means of BIMROCK model curve. In addition, limit equilibrium analysis is carried out to verify the rational shear strength evaluation.
Experimental Study of Frozen Barrier Using Artificial Ground Freezing System
Shin, Eun-Chul ; Kang, Hee-Myeong ; Park, Jeong-Jun ; Kim, Sung-Hwan ;
Journal of the Korean Geosynthetic Society, volume 8, issue 3, 2009, Pages 35~44
The purpose of this study was to prevent spreading of contaminants from movement of underground water by creating a barrier using artificial freezing method on a soil contaminated by oils and various NAPLs. Specimens with 80% and 90% degrees of saturation were prepared to form freezing barrier using artificial freezing method. With increasing freezing time of freezing barrier, barrier was formed faster in the specimen with 90% degree of saturation by about an hour compared to the specimen with 80% degree of saturation. In addition, thinnest thickness of frozen barrier in both specimens was 50mm after 12 hours of freezing time, showing expansion of freezing area with time. The results of this study can be applied to barrier in waste reclamation sites and contaminated regions or to flow control of contaminants.
A Study on Connection Strength Evaluation of Wall Facing/Geogrid Using I-type Connection Device
Han, Jung-Geun ; Hong, Ki-Kwon ; Cho, Sam-Deok ; Lee, Kwang-Wu ;
Journal of the Korean Geosynthetic Society, volume 8, issue 3, 2009, Pages 45~52
The use of geogrid-reinforced earth wall technologies has progressed rapidly over the past 10 years in Korea because these technologies have advantages such as economical efficiency, graceful appearance, and easy construction. The geogrid used in the reinforced earth wall with concrete block facing can be subjected to damage among the upper and lower blocks and at the interface between the block and the geogrid. Therefore, when design of the geogrid-reinforced soil walls the required connection strength of the geogrid to the wall facing is an issue. In this study, new connection system between facing block and geogrid is developed to improve the damages of geogrid in the existing connection systems. The new connection devices are made of steel and have I-shape. This paper describes the test method and results of the laboratory testing for determination of connection strength in connection system using the I-type connection device.