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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 13, Issue 4 - Dec 2014
Volume 13, Issue 3 - Sep 2014
Volume 13, Issue 2 - Jun 2014
Volume 13, Issue 1 - Mar 2014
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A Study on the Sedimentation of Dredged Soils and Shape Changes of a Transparent Vinyl Tube by Filling Tests - Anti-Crater Formation -
Kim, Hyeong-Joo ; Sung, Hyun-Jong ; Lee, Kwang-Hyung ; Lee, Jang-Baek ;
Journal of the Korean Geosynthetic Society, volume 13, issue 2, 2014, Pages 1~10
DOI : 10.12814/jkgss.2014.13.2.001
In this study, two different types of dredged fill injection methods are introduced and filling experiments were conducted to analyze the impact of each technique to the distribution and deposition of dredged soil fill and how it influence the final tube shape. Two transparent plastic tubes were fabricated to observe the deposition behavior of the deposited fill material. Both tubes measured 4.0 meters in length (L) and has vinyl tube diameters (D) of 0.5m and 0.7m. T-type and I-type inlet system are also introduced in this paper. The influence of this inlet systems to the distribution and deposition behavior of dredged soil fill inside the vinyl tubes were observed during the experiment. After the sedimentation of the slurry mixture, the water on top of the soil sediments are removed and the slurry mixture was re-injected into the vinyl tube, this process was carried out repeatedly. The shape changes of the vinyl tube, e.g. the changes in both tube height and width, are constantly monitored after each slurry injection and water draining phases. Crater formation was observed in the case of I-Type inlet system and a non-uniform sediment distribution occurred. For the diffusion deposit of soil particles to long distance are minimal shape technique using the T-Type inlet system. Therefore the undrain filling height ratio (
) was found to be around 0.54 to 0.64 and the horizontal strain ratio (
) ranges from 1.45 to 1.54. The filling soil height is proportional to dredged-material filling phases, but, horizontal strain ratio is constant or inversely reduced so that the center of tube body is raised in the upward direction.
Evaluation of Discharge Capacity for Gravel mat due to Geosynthetic Using Calibration Chamber Test
Kim, Jae-Hong ; Im, Eun-Sang ;
Journal of the Korean Geosynthetic Society, volume 13, issue 2, 2014, Pages 11~20
DOI : 10.12814/jkgss.2014.13.2.011
To create a large-scale complex, it is often the case to perform ground improvement by using vertical drain method after the reclamation of coastal soft ground, for construction period shortening and stable site renovation. During this process, the pore water migrates to the horizontal drainage layer of the ground surface through the vertical drain installed in the soft ground and discharged out to the open. In the past sand was used as the material for the horizontal drainage layer in numerous cases, however recently, due to material shortage and high pricing, the use of crushed stones has increased. To prevent mixing of the materials between the horizontal drainage layer and the upper landfill, geosynthetics (PPMat) are installed. However, the use of geosynthetics results in high additional cost for material purchase and installation, therefore it is necessary to examine the validity of the installation itself. In this study, to verify the necessity, model tests were performed. Results from the model tests indicate that the drainage ability of the horizontal drainage layer is barely affected by the application of geosynthetics.
Applicability of Solidified Soil as a Filling Materials in the Drilling of the Bored-precast Pile
Kim, Khi-Woong ; Park, Jeong-Jun ; Han, Byung-Kwon ;
Journal of the Korean Geosynthetic Society, volume 13, issue 2, 2014, Pages 21~29
DOI : 10.12814/jkgss.2014.13.2.021
The use of filling material based on cement paste is inefficient at field construction because it needs a lot of the charging mass. In addition, it has environmental problem according to the large amount of cement use because its strength is also larger than criterion. The excavated soil with stabilizer can be used as the filling materials when the bored pile is constructed. Therefore, this paper describes field application of solidified soil for economical efficiency and environment-friendly. The static axial load tests and the load-transfer measurements were performed to examine the axial resistant behavior of the piles. As results, the flowability, segregation and bleeding, and bond strength of filling materials was a good performance than that of the existing cement paste. But the skin friction of pile by PDA was slightly decreased than that of the existing cement paste. However, as pile filling materials, and in terms of economics and environment, the applicability of filling material is considered very effective.
Effect of Configuration of Shaft and Helix Plate on Bearing Capacity of Moderate-size Helical Pile : I. Test-bed Construction and Field Loading Test
Lee, Jongwon ; Lee, Dongseop ; Kim, Hyung-Nam ; Choi, Hangseok ;
Journal of the Korean Geosynthetic Society, volume 13, issue 2, 2014, Pages 31~39
DOI : 10.12814/jkgss.2014.13.2.031
The helical pile is a manufactured steel pile consisting of one or more helix-shaped bearing plates affixed to a central shaft. This pile is installed by rotating the shaft into the ground to support structural loads. The advantages of helical piles are no need for boring or grout process, and ability to install with relatively light devices. The bearing capacity of the helical pile is exerted by integrating the bearing capacity of each helix plate attached to the steel shaft. In this paper, to estimate the bearing capacity of moderate-size helical piles, 6 types of helical piles were constructed with different shaft diameter, plate configuration and the penetration depth. A series of field loading tests was performed to evaluate the effect of helical pile configuration on the bearing capacity of helical pile, constructed in two different shaft diameters (i.e. 73 mm and 114 mm). In the same way, the diameter of bearing plate was also changed from 400mm to 250mm with one or three plates. As well, the penetration depth was varied from 3m to 6m to analyze the relation between the penetration depth and the bearing capacity. As a result, not only the increase of the shaft diameter, but also the number or diameter of helix bearing plates enhances the bearing capacity. Especially the configuration of the helix plate is more critical than the shaft diameter.
Effect of Configuration of Shaft and Helix Plate on Bearing Capacity of Moderate-size Helical Pile : II. Bearing Capacity Prediction
Lee, Jongwon ; Lee, Dongseop ; Na, Kyunguk ; Choi, Hangseok ;
Journal of the Korean Geosynthetic Society, volume 13, issue 2, 2014, Pages 41~47
DOI : 10.12814/jkgss.2014.13.2.041
Various prediction methods for the bearing capacity of helical piles have been introduced with consideration of both the steel shaft and the helix plates attached to the shaft. In this paper, three representative methods, that is, individual bearing method, cylindrical shear method, and torque correlation method are discussed and compared to each other. The prediction methods were verified by comparing with a series of loading test results performed on moderate-size helical piles from the companion paper. As a result, the measured bearing capacity is greater than the bearing capacity predicted by the cylindrical shear method, but smaller than that of the individual bearing method. In addition, the bearing capacity predicted by the torque correlation method is in good agreement with the measured bearing capacity.
A Study on the Liquefaction Behavior of Soil in Jangbogo Station
Park, Keunbo ; Kim, YoungSeok ;
Journal of the Korean Geosynthetic Society, volume 13, issue 2, 2014, Pages 49~57
DOI : 10.12814/jkgss.2014.13.2.049
In this study, in order to take advantage of samples collected in the Jangbogo station, and to grasp the liquefaction resistance characteristics of the dynamic load was performed cyclic triaxial test. Also, through the comparison with the existing literature. The test results, for the relationship between number of cycles for the same cyclic shear stress ratio and the cyclic shear stress ratio to produce an axial strain of 5%, in all samples, the cyclic shear stress ratio to liquefaction for the specimen, which has been liquefied, was increased, whereas number of cycles were reduced. The cyclic shear stress ratio of samples first decrease up to the fine content of about 10%. After this strength level, there is a little increase in cyclic shear stress ratio with increasing fine content. In addition, the cyclic shear stress ratio between cohesive strength, mean particle size, and friction angle decrease but some time later, there was a tendency that cyclic shear stress ratio is a little increased.
Adsorption Characteristics Evaluation of Natural Zeolite for Heavy-metal Contaminated Material Remediation
Shin, Eun-Chul ; Park, Jeong-Jun ; Jeong, Cheol-Gyu ; Kim, Sung-Hwan ;
Journal of the Korean Geosynthetic Society, volume 13, issue 2, 2014, Pages 59~67
DOI : 10.12814/jkgss.2014.13.2.059
The amount of the contaminants that can be adsorbed on the drain was evaluated for the effective remediation of the contaminated soil, and the contaminants adsorptivity of the drain was evaluated by comparing the isothermal adsorption model after carrying out the contaminants adsorption test of the reactants coated on the surface of the drain. The reactant used in the experiment is a natural zeolite, and the contaminants are copper, lead and cadmium. The results that Freundlich and Langmuir adsorption isotherm model are compared to the adsorption amount according to the change of the initial concentration by the contaminants. As a result of the component analysis, because Si, Al and O are contained approximately 28%, 11% and 48%, respectively, it is identified that the material coated on the surface of the drain is the component of the zeolite which is the reactant for the adsorption of the heavy-metal (Cu, Pb, Cd) contaminants. The heavy-metal adsorption kinetic of the zeolite which is the reactant was decreased in order of lead, copper and cadmium. The important factor of the performance evaluation of the adsorbent is the reaction rate, and if zeolite is used as the reactant in the relationship between the maximum amount of adsorption and reaction rate, it can be utilized as the design factor that determine the removal order of the complex heavy-metal. In other words, because the maximum adsorption quantity of lead is smaller compared to copper but the reaction rate is relatively fast, it can be primarily removed, and copper can be removed after removing the lead. It was analyzed that Cadmium can be finally removed after that other heavy-metal is removed.