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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 Applicability of Levee Leakage Monitoring System Using Movable TDR Sensor
Cho, Jinwoo ; Choi, Bong-Hyuck ; Cho, Won-Beom ; Kim, Jin-Man ;
Journal of the Korean Geosynthetic Society, volume 13, issue 3, 2014, Pages 1~10
DOI : 10.12814/jkgss.2014.13.3.001
Several types of methods such as resistivity survey, ground penetration radar, etc are used for detection of levee leakage and according to the river design guidelines detection of levee leakage is performed by measuring the hydraulic conductivity of levee soil. But, the former can not verify the leakage point and degree of saturation, the latter is an after treatment method. Movable sensor, which is a high-tech TDR system developed since 2000, can obtain directly the dielectric constant profile covering the whole depth of levee. In this study, laboratory and field model experiments were carried out using movable TDR sensor in order to evaluate the applicability as detection system of levee leakage, As the result, movable TDR system has proven to be 3 times more sensitive to water contents than dry unit weight, and the results conclude that the dielectric constant, water contents and density of the ground proved to have a correlation among them, and the dielectric constant is expected to be a basic data on detection of levee leakage.
Evaluation on Degree of Interference Based on Installation Characteristics of Transverse Members Installed in Steel Strip Reinforcement
Jung, Sunggyu ; Hong, Kikwon ; Han, Jung-Geun ; Lee, Kwang-Wu ;
Journal of the Korean Geosynthetic Society, volume 13, issue 3, 2014, Pages 11~19
DOI : 10.12814/jkgss.2014.13.3.011
This paper describes interference effect analysis of transverse member based on large-scale pullout test results of steel strip reinforcement with `
` type transverse member. The maximum passive resistance has a difference according to the installed location of transverse member, and the total pullout resistance is increased, when transverse member was closed to the wall facing. The degree of interference confirmed that the install location of transverse member cannot reflect the pullout force differential, if S/B is equal. However, The interference factor based on maximum passive resistance reflected the differential of maximum passive resistance and install location of transverse member.
A Mechanical Properties According to the Compaction Degree on Weathered Granite Soil Using Lightweight Dynamic Cone Penetrometer
Kim, Yeon-Il ; Kim, Jin-Young ; Shim, Jae-Rok ; Choi, Jin ; Kang, Kwon-Soo ; Baek, Won-Jin ; Lee, Kang-Il ;
Journal of the Korean Geosynthetic Society, volume 13, issue 3, 2014, Pages 21~30
DOI : 10.12814/jkgss.2014.13.3.021
In this study, the applicability of the lightweight dynamic cone penetrometer in the domestic slope site was investigated using the weathered granite soil sampled form the Namwon slope site. And then, the lightweight dynamic cone penetration tests according to the change in the degree of compaction and water content were performed and it was analyzed with the correlations between the degree of compaction, the void ratio, the degree of saturation and the value of cone resistance. From the laboratory test results, the cone penetration resistance was rapidly increased in the dry side of the optimum moisture content, and it was largely decreased in the wet side of the optimum moisture content. Moreover, when the degree of compaction and the degree of saturation are large, the cone resistance is increased linearly. And a high correlativity was shown between water content, void ratio, the degree of saturation and the cone resistance. From these results, it is judged that the lightweight dynamic cone penetrometer can be applied to the investigation on the site slope.
A Study on Design Method of Geogrid Encased Stone Colum for Settlement Reduction in Railroad
Lee, Dae-Young ;
Journal of the Korean Geosynthetic Society, volume 13, issue 3, 2014, Pages 31~38
DOI : 10.12814/jkgss.2014.13.3.031
The geogrid encased stone column (GESC) system, which increases the confinement effect, has been developed to improve the load carrying capacity of stone columns. The resonable design method for calculating the geogrid ring tension force and ultimate bearing capacity that can be applied to the design of GESC is proposed. In order to calculate design procedure for GESC, two ultimate bearing capacities were compared. One is the ultimate bearing capacity measured using data of the field loading test in light railway site and the other is the ultimate bearing capacity using suggested design procedure of GESC. The results indicated that design method of GESC higher ultimate bearing capacities compared with field loading test.
Dynamic behavior of Track/Roadbed with Loading Frequency in Concrete Track through Full Scale Model Test
Choi, Chanyong ; Kim, Hunki ; Eum, Kiyoung ; Kang, Yunsuk ;
Journal of the Korean Geosynthetic Society, volume 13, issue 3, 2014, Pages 39~47
DOI : 10.12814/jkgss.2014.13.3.039
In this study, the full scale model tests were performed with track-roadbed system such as Ho-nam high speed railway. The measured data gives good similar a roadbed pressure with equivalent depth to the Odemark`s theory. In the case of earth pressures have a under 50 kPa at upper-subgrade applying 330 kN static loading. Results of cyclic loading tests did not differ significantly from those of static loading test. The elastic displacement at HSB layer has a level of 1/100 compared to the 1 mm that it was evaluation criteria for speed up of High Speed Railway. Elastic displacement at subgrade layer was measured a level of 1/175. The dynamic characteristics of track-roadbed with loading frequency level were linearly increased under 35 Hz, while the wheel loading, displacement and acceleration of roadbed were decreased loading frequency above 35 Hz.
Effect of Cycles of Freezing and Thawing on the Behavior of Retaining Walls using Reduced-Scale Model Tests
Yoo, Chungsik ; Jang, Dong-Wook ;
Journal of the Korean Geosynthetic Society, volume 13, issue 3, 2014, Pages 49~58
DOI : 10.12814/jkgss.2014.13.3.049
This paper presents the results of a reduced-scale physical model investigation into the behavior of retaining walls subject to cycles of freezing and thawing due to seasonal temperature change. Reduced-scale model walls equipped with a temperature control chamber that can simulate freezing and thawing conditions were first constructed and a series of tests were conducted with due consideration of different initial water contents of backfill soil and soil types. The results indicate that cycles of freezing and thawing process increase wall deformation as well as earth pressure acting on the wall. Also revealed was that the effect of the freezing and thawing cycles becomes more pronounced for cases with a larger initial water content and for soils with a larger fine content. Practical implications of the findings from this study are discussed in great detail.