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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 11, Issue 4 - Dec 2012
Volume 11, Issue 3 - Sep 2012
Volume 11, Issue 2 - Jun 2012
Volume 11, Issue 1 - Mar 2012
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The Comparative Experiment of Geogrid Reinforcement Types with Construction Stage on Segmental Retaining Walls
Lee, Sung-Hyouk ; Lee, Jin-Wook ; Choi, Chan-Yong ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 1~8
DOI : 10.12814/jkgss.2012.11.4.001
In this study, the earth pressure, displacement and strain were compared with reinforcement types at segmental retaining wall through full scale model test. The test results found that the measurement of earth pressure and displacement at wall for the fully reinforced retaining wall are different from those for the partly reinforced retaining wall. The analyses of these results would suggest that the used of geoogrid allowed the vertical earth pressure and displacement at wall to be reduced. The horizontal earth pressure in upper and lower part of wall can change with reinforcement type and earth deformation and were larger than the active and the rest pressure. Also, the lateral earth pressure and displacement of wall have a very high a correlation. It was found that the strain contour distribution of reinforcements was occurred a large strain at cental part of wall in segmental retaining wall system.
Immobilization and Recycling of Arsenic-Contaminated Fine Soil Cake Produced after Soil Washing Process
Oh, Minah ; Moon, SoYoung ; Hyun, Min ; Chae, HeeHoon ; Lee, Jai-Young ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 9~16
DOI : 10.12814/jkgss.2012.11.4.009
Standardized remediation process for the soil contaminated with arsenic is insufficient due to characteristics of its anion-mobility and speciation changed by Eh-pH of soil. One of the well-known efficient remediation processes is the modified soil washing that particle separation process by only water. However, it is required that the treatment plan for the fine soil what was discharged after modified soil washing. Therefore, this research suggests the treatment plan that the recycling method using arsenic immobilization by FeS-
. The batch experiments results for the arsenic immobilization showed that the water content was at least 50%, the injection of FeS and
(assay-35%) were 8% (w/watdrybase) and 0.2 mL/10 g of fine soil respectively. Arsenic concentration with KSLT was decreased about 95.4%. The results indicated that the mixing of FeS-
was highly efficient on the immobilization of As-contaminated soil. The mixing ratio as 13% of bentonite with 3% of cement (at based on 100% of immobilized fine soil) was satisfied with standard of liner for landfill construction.
A Comparative and Parametric Study of Slope Stability Using a Probability-based Method in Railway Slope
Choi, Chan-Yong ; Kim, Ju-Yong ; Eum, Ki-Young ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 17~25
DOI : 10.12814/jkgss.2012.11.4.017
In this study, it was carried out reliability analysis and slope stability analysis in a standard cross-sectional embankment on high speed railway. It was confirmed that changing tendency of safety factor with various parameter of each soil materials properties and trends of the probability of failure according to the reliability index. The results have shown that a safety factor were relatively large affected an cohesions and internal friction angle of soil compared to the unit weight of soil. Also, most of the standard cross-sectional embankment in high speed railway was generally evaluated the level of below average (below average) by the reliability analysis according to criterion in US. Army but the 12m height of dry embankment case was shown bad condition as Poor.
Effects of Vertical Spacing and Length of Reinforcement on the Behaviors of Reinforced Subgrade with Rigid Wall
Kim, Dae-Sang ; Park, Seong-Yong ; Kim, Ki-Hwan ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 27~35
DOI : 10.12814/jkgss.2012.11.4.027
Facings of mechanically stabilized earth retaining walls have function to fix the reinforcement and prevent backfill loss, but the walls are lack of structural rigidity capable of resisting applied loads. The reinforced subgrade with rigid wall was developed to have the structural functions under train loading. Though it has lots of advantages such as small deformation after construction, its negative side effects of economics and difficult construction were mainly mentioned and not practically used. To apply it for railroad subgrade, this study focus on the construction cost down and the enhancement of constructability without functional loss. To do so, the behaviors of reinforced subgrade with rigid wall were evaluated with the change of the vertical spacing and length of reinforcement. Small scale model tests (1/10 scale) and 3 m full scale tests were performed to evaluate deformation characteristics of reinforced subgrade under simulated train loading. Even though it uses short reinforcement, it showed small horizontal displacement of wall and plastic settlement of subgrade. Also, it was verified that not only 30 cm but also 40 cm of vertical spacing of reinforcement had good performance in serviceability aspects.
Pullout Resistance Characteristics of Strip-type Reinforcement based on Extensibility
Lee, Kwang-Wu ; Cho, Sam-Deok ; Han, Jung-Geun ; Hong, Kikwon ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 37~44
DOI : 10.12814/jkgss.2012.11.4.037
This paper describes large scale pullout test results, in order to evaluate extensibility effect of strip-type reinforcement. The same test for ribbed steel strip reinforcement also is conducted to compare the friction resistance reinforcements' evaluation results. The pullout resistance of the ribbed steel strip reinforcement, which has a small cross sectional areas, was better than the friction resistance reinforcements' due to the bearing (passive) resistance. In case of friction resistance reinforcements, the pullout resistance of extensible reinforcement was better than inextensible reinforcement' even though they have a similar cross sectional areas.
A Study of Correlation between SPT N-value and Exerted Electrical Energy Required for Ground Drilling I : Basic Study (Laboratory Soil Box Test)
Choi, Changho ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 45~53
DOI : 10.12814/jkgss.2012.11.4.045
Ground drilling is a common method to conduct site investigation, soil improvement, and pile installation. In the point of construction ground drilling requires electrical energy to drill a hole in ground in which the energy exerts into the motor located on the head of auger and generates rotational power. In this paper it is verified that the exerted electrical energy is closely related to the strength characteristics of ground. Measurement sensors, recording system, and drilling system were developed to obtain exerted motor current and drilling depth and laboratory soil box tests were carried out. The measured motor current and boring depth were applied to predict SPT N-value and the prediction results were compared to SPT N-value of laboratory tests. The test results show that the exerted electrical energy to bore ground be a good index to estimate SPT N-value.
A Study of Correlation between SPT N-value and Exerted Electrical Energy Required for Ground Drilling II : Application Study (Field Pilot Test)
Choi, Changho ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 55~62
DOI : 10.12814/jkgss.2012.11.4.055
In this application study, field pilot tests were performed to evaluate the validity of a proposed formula between the exerted electrical energy and SPT N-value based on the result of the basic study. Measurement sensors and recording system were developed to obtain exerted motor current and drilling depth in a field. By using the correlation formula proposed in the basic study, the measured motor current and boring speed were applied to predict SPT N-value and the predicted N-values were compared to SPT N-value of site exploration. From the comparisons it is verified that the exerted electrical energy to bore ground might be used to predict SPT N-value and pile tip location.
Analysis of Saturation Depth by Rainfall Intensity and Soil Conditions on Slope
Lee, Seung-Woo ; Jang, Bhum-Soo ; Kim, Sung-Ho ; Heo, In-Young ; Hong, Suk-Pyo ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 63~69
DOI : 10.12814/jkgss.2012.11.4.063
Climate change, according to the country to increase locality of slope collapse of heavy disaster, such as increasing the likelihood and prior in order to prevent these disasters, "Slope construction design standards (Ministry of Land, 2011)," is prescribed in the relevant guidelines. In recent years, guidelines Slope Stability Analysis of the existing methods when the rainy season infiltration of rainfall, taking into account have been revised to perform more realistic. In this study, according these trends to the analysis of saturation depth by rainfall intensity and soil conditions. Results as a whole, the larger the saturated hydraulic conductivity and depth of rainfall intensity also showed a tendency to rise in proportion but MH, CL did not occur in the saturation region. Analysis of antecedent rainfall case also reflects an overall increase of depth in the saturated, rainfall in many cases is less than the growth rate was higher in the saturation region.
The development of Evaluation Program for the Quantitatively Instrumentation Management of Geotechnical Structures
Kim, Yong-Soo ; Yun, Hae-Bum ;
Journal of the Korean Geosynthetic Society, volume 11, issue 4, 2012, Pages 71~77
DOI : 10.12814/jkgss.2012.11.4.071
In this study, data collected from geotechnical instrumentation, analyzers using Stochastic methods for evaluating the state of law and the automation program was developed. Is expected based data driven non-parametric methods modeling may be useful for evaluation of complex geotechnical instrumentation installed on the system from the measurements collected. Result of the verification of assessment techniques developed by the sensing data collected from the actual ground structures (reinforced retaining wall and tunnel), PCA analysis techniques applied to the present study was to determine the structural behavior and environmental factors.