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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
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Volume & Issues
Volume 9, Issue 4 - Dec 2010
Volume 9, Issue 3 - Sep 2010
Volume 9, Issue 2 - Jun 2010
Volume 9, Issue 1 - Mar 2010
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Reinforced Effects of Soil-nailed Structures by a Vertical Coupling of a Exposed Nail at a Front
Kim, Joon-Seok ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 1~7
The soil nailing method have been developed on the basis of experimental works as well as theoretical backgrounds. As for the experimental research works, most of the data have been measured during the application of load in service. However, not only the soil-nailed structure behavior in service but also the failure behavior of the structure are the major concerns to evaluate and even establish a design method of soil-nailed walls. In this paper for the apprehension of behavior in the soil-nailed structure which the front of nail is connected, a relatively large-scale experiment was carried out to figure out the failure behavior of soil-nailed wall. A number of data have been acquired and analysis.
Analysis of Heaving and Settlement Test of Scale Model Depending on Shape of the Pipe during Pipe Roof Excavation
Eum, Ki-Young ; Choi, Chan-Yong ; Cheon, Jeong-Yeon ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 9~15
In this study, a non-open cut method using a round or square pipe which has been commonly employed in Korea was experimentally evaluated and the behavioral features resulting from the friction while the pipe is penetrated into the ground was identified through the scale model test. To that end, a test device was fabricated by type of penetration pipe, by which the surface displacement caused by surrounding friction resistance was monitored. To simulate the settlement and heaving by excavation stage, the test was conducted based on generalized friction condition and surface displacement and the result therof was compared and analyzed, considering the type of penetration pipe.
Reliability Analysis in Designing of Reinforced Soil Structures using Uni-Modal Bounds
Kim, Hyun-Ki ; Lee, Sung-Hyouk ; Choi, Chan-Yong ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 17~25
Evaluation of stability in traditional designing of reinforced soil structures is executed by examination of internal and external stability. Analysis of internal stability is for pull-out and ductile strength. Analysis of external stability is for settlement, overturning and sliding. To minimize inherent uncertainties of soil properties and analytical model, reliability analysis was developed recently. In this study, reliability analysis method considering simultaneous failure probability for various failure mode of internal and external stability is proposed. By applying uni-modal bounds, Stability of system reliability of reinforced soil structures is evaluated by integrating multi failure mode for various analytical model. Because of complex consideration for various failure shapes and modes, it is possible to secure advanced safety by using simultaneous failure probability. And evaluation of reinforced soil structure is executed by representative index, simultaneous failure probability, than previous method.
The Reinforcement Effect of Woven Geotextiles for Railway Roadbed High-Embankment on Soft Ground by the Limit Equilibrium Analysis
Kim, You-Seong ; Choi, Jae-Seon ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 27~37
Woven geotextiles (polyester mats) reinforcement is generally used to improve traffic ability, bearing capacity, and slope stability for embankment construction on soft ground. Cases of two high-strength woven geotextiles reinforcement layers are introduced in the present paper, which has been successfully constructed for rail road embankment on soft ground. According to the case results based on the limit equilibrium analyses of slope stability, the two high-strength woven geotextiles reinforcement layers on the soft ground can substantially increase the stability of the embankment by about 25%, improve the safety factor from 0.91 to 1.14, and significantly reduce the embankment construction duration at least 2 months. Therefore, the application of high-strength woven geotextiles is found to be useful for in-situ cases having the lack of construction duration and stability, as a soft ground improvement.
Effect of Non-Woven Geotextile Reinforcement on Mechanical Behavior of Sand
Kim, You-Seong ; Oh, Su-Whan ; Cho, Dae-Seong ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 39~45
The effects of non-woven geotextiles on mechanical behavior of sand were investigated. A comprehensive series of triaxial compression tests were performed for these investigation on unreinforced and reinforced sand with geotextiles. The Joomunjin standard sand was used and non-woven geotextiles were included into sand specimen with three layers. The inclusion of non-woven geotextile reinforcement into sand increased the peak strength of sand significantly and the reinforced samples exhibited a greater axial strain at failure. Also the effect on number of reinforcement layers was studied and found as increasing the number of reinforcement layers resulting in more ductility by clogging developed in the shear band within the specimens. It was also found that the tendency of samples to dilate is restricted by non-woven geotextile inclusion. The effect of nunber of reinforcement layer increasing is just same to the effect of decreasing void ratio of sand in this case.
An Analytical Study on Bearing Mechanism of Very Soft Ground Covered with Geotextile by Effects of Friction between Ground and Geotextile
Ahn, Dong-Han ; You, Seung-Kyong ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 47~55
In general, ground surface strengthening such as using geotextile is needed to secure trafficability of construction equipment. There are many researches for mechanical beha-vior of very soft ground covered with geotextile, however, most of them are under the condition to fix geotextile completely. In this study, numerical analyses were carried out to figure out the effects of restricting conditions of geotextile on bearing mechanism of very soft ground covered with geotextile. In numerical analyses, joint elements were used to figure out the friction properties between ground and geotextile. The results of numerical analyses were compared with the results of model test. In conclusion, the effects of restricting conditions of geotextile on bearing mechanism of very soft ground covered with geotextile became clear.
A Study on Countermeasure and Contamination Analysis for Heavy Metal Pollution of Nearby Area using Stony Mountain Field Case
Han, Jung-Geun ; Yoon, Won-Il ; Lee, Yang-Kyu ; Lee, Jong-Yuong ; Hong, Ki-Kwon ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 57~66
This study is described in heavy metal pollution by the stony mountain development using field case. The heavy metal pollution is investigated for nearby area (soil and stream) of the developed stony mountain, and then the countermeasure using contamination analysis is suggested. The investigation result indicated that contamination of Sammak stream caused by the stone dust and leachate at the stony mountain development. Therefore, the heavy metal pollution is evaluated by using Pollution Index(PI). The evaluation results confirmed that the contaminated groundwater was the leading cause of the contamination in Sammak stream and nearby soil. Therefore, the Permeable Reaction Barrier(PRB), which has a environmentally-friendly reactant, should be applied to control a heavy metal of groundwater, and it will be a reasonable countermeasure.
Strength Characteristics of Soils mixed with Crushed Stone as a Backfill of Reinforced Earth Wall
Park, Jong-Beom ; Ju, Jae-Woo ; Kim, Hyun-Do ; Na, Hyun-Ho ; Han, Sang-Ho ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 67~73
The most important thing in the design of the reinforced earth retaining wall is to obtain the good backfill materials. However there was a special case using soils mixed with the crushed stone, because the field ran short of good backfill soils. Accordingly in this study various kind of tests were performed according to the mixing content of a crushed stone, which are the gradation curve, the direct shear test and the pullout test. From the test results at first the gradation of soils mixed with crushed stone has been compared with the selecting standard as backfill of reinforced earth wall. And the gradation standard has been satisfied in case of mixing ratio 20% of a crushed stone under 19mm. Also the direct shear test and the pullout test have been performed and at the test results the shear strength parameter and the pullout strength parameter were increased with the increse of the mixing content of a crushed stone. It has been thought that this study will give important data to a designer in designing the reinforced earth wall with soils mixed with crush stones.
Experimental Study on Long-Term Performance Evaluation of Geosynthetic Strip Reinforcement
Lee, Kwang-Wu ; Kim, Ju-Hyeung ; Cho, Sam-Deok ; Han, Jung-Geun ; Yoon, Won-Il ; Hong, Ki-Kwon ;
Journal of the Korean Geosynthetic Society, volume 9, issue 4, 2010, Pages 75~84
In this study, the long-term performance tests, which have extensibility, creep deformation, installation resistance and durability characteristic, is conducted to apply geosynthetic strip in field. The strength reduction factors using the test results are evaluated in order to calculate long-term design tensile strength. First, the creep deformation was evaluated by both the stepped isothermal method(SIM) and the time-temperature superposition(TTS) method. The creep reduction factor is reasonable to apply 1.6. Second, the result of installation damage test had little damage of yarn, which affected strength of reinforcement. Therefore, it can be analyzed that the installation damage of geosynthetic strip has little effect of long-term design tensile strength. Finally, the durability reduction factor considering chemical, biological and outdoor exposure resistance is reasonable to apply 1.1, which is considered the stability and economic efficiency of reinforced earth wall using geosynthetic strip.