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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geoenvironmental Society
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Journal DOI :
Korean Geo-Environmental Society
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Volume & Issues
Volume 14, Issue 12 - Dec 2013
Volume 14, Issue 11 - Nov 2013
Volume 14, Issue 10 - Oct 2013
Volume 14, Issue 9 - Sep 2013
Volume 14, Issue 8 - Aug 2013
Volume 14, Issue 7 - Jul 2013
Volume 14, Issue 6 - Jun 2013
Volume 14, Issue 5 - May 2013
Volume 14, Issue 4 - Apr 2013
Volume 14, Issue 3 - Mar 2013
Volume 14, Issue 2 - Feb 2013
Volume 14, Issue 1 - Jan 2013
Selecting the target year
Thermal Analysis of Silty Sand Soil by Pipe Heater Installed in the Ground
Park, Mincheol ; Lee, Kumsung ; Jang, Jaeho ; Han, Heuisoo ;
Journal of the Korean Geoenvironmental Society , volume 14, issue 5, 2013, Pages 5~13
Three different mechanisms : line source model, commercial program(Temp/W) and filed test were used to analyse the thermal behavior of soil in this study. The results of in-site test were similar to line source model and program, the resulted graph showed log pattern curves. After 3 days of soil heating, the vapor emission was continuous with increased range of temperature whose radius is about 1m. The ground was excavated to examine with naked eyes where about 20cm range from pipe heater was completely sintered. Therefore, the soil heating through pipe in ground could be used to soil improvement successfully. In addition, the vapor caused by soil heating was emitted to upward and the most heat was transferred to horizontal direction.
Prediction of the Scour Depth around the Pipeline Exposed to Waves using Neural Networks
Kim, Kyoungho ; Cho, Junyoung ; Lee, Hojin ; Oh, Hyunsik ;
Journal of the Korean Geoenvironmental Society , volume 14, issue 5, 2013, Pages 15~22
The submarine pipe, which is one of the most important coastal structures, is widely used in the development of coastal and ocean engineering. The scour of the submarine pipe occurs due to the wave and the current according to the state of the sea bed. The scour affects the submarine pipe and causes it to undergo settlement and fatigue. It is difficult to predict the local scour under complicated and various conditions of the coastal environment, even though many researches on the scour of the submarine pipe have been studied in recent years. This study analyzed the scour depth around a submarine pipe by using the Neural Network technique. The back-propagation algorithms was used to train the Neural Network. The 58 simulating experimental data for the performance and validation of the Neural Network technique were analyzed in this study. Then, the regression analysis for the same data was performed in this study to predict and compare with the Neural Network technique for the scour depth.
Effects of Pile Diameter on the Lateral Behavior of Offshore Pile in the Southwestern Area of Korea
Lee, In ; Choi, Younggyun ; Kim, Honglak ; Kwon, Osoon ; Youn, Heejung ;
Journal of the Korean Geoenvironmental Society , volume 14, issue 5, 2013, Pages 23~32
This paper presents the effect of pile diameter on the lateral behavior of offshore pile for wind turbine. The material parameters of the soils were estimated through SPT on the Southwestern offshore area in Korea, where the first wind farm is planned. The FDM software, FLAC3D, and LPile were adopted to derive the load-displacement curve, p-y curve, and maximum bending moment at a specified displacement. It was found that the results from softwares significantly differ and the LPile could overestimate the allowable capacity. The maximum bending moment along the pile with 2m diameter could be as large as four times the bending moment with 1m diameter. Similar trend was observed for the allowable lateral capacity.
Geotechnical Characteristics of the Ulleung Basin Sediment, East Sea (1) - Cosolidation and Shear Waves Velocity
Kim, Youngmoon ; Lee, Jongsub ; Lee, Jooyong ; Lee, Changho ;
Journal of the Korean Geoenvironmental Society , volume 14, issue 5, 2013, Pages 33~39
A drilling exploration in deep sea is being processed to develop new energy resource in the world. In 2007, the presence of the gas hydrate had been confirmed during the UBGH1 (Ulleung Basin Gas Hydrate Expedition 1) in the Ulleung Basin. Geotechnical properties of the deep marine sediment are important factors for assessing the safety of gas production facility and productivity from the hydrate bearing sediment. In this study, comprehensive laboratory tests are conducted to investigate the geotechnical engineering characteristics of the deep marine sediments recovered from the hydrate occurrence regions during the UBGH2 (Ulleung Basin Gas Hydrate Expedition 2) in the Ulleung Basin, East Sea, Korea. The index properties of the specimens including the specific gravity, atterberg limits, specific surface, and particle size distribution are measured, and these are compared to the results reported by previous studies. A zero-lateral strain cell, which houses bender elements, is used to determine stress-dependant characteristics and shear wave velocities with the vertical effective stresses. Furthermore, the hydraulic conductivity is calculated based on the consolidation test results.
A Study on the Effects of the Coefficient of Uniformity and Porosity on the Soil-Water Characteristic Curves of Sandy Soils
Yoo, Kunsun ;
Journal of the Korean Geoenvironmental Society , volume 14, issue 5, 2013, Pages 41~47
Well-graded and dense soils have good engineering properties. Unsaturated soil properties such as shear strength, compressibility and permeability are closely related to the soil-water characteristic curve of the soil. Therefore it is important to study the effects of the coefficient of uniformity and the porosity on the soil-water characteristic curve of the sandy soils, which are also related to the grain size distribution and the density of the soil, respectively. In this study soil-water characteristic curves (SWCCs) for six sandy soil specimens were investigated using Tempe pressure cells. The test data were best-fitted to Fredlund and Xing equation. The obtained fitting parameters and the characteristic points of SWCCs were discussed and correlated with the porosity and the coefficient of uniformity of the specimens. The results show that the smaller the porosity of the specimen becomes, the larger the value of the residual matric suction becomes, whereas the larger the coefficient of uniformity of the specimen becomes, the larger the value of the residual matric suction becomes. Regardless of the coefficient of uniformity, the smaller the porosity of the specimen, the flatter the max. slope of SWCC.
Geotechnical Characteristics of the Ulleung Basin Sediments, East Sea (2) - Microstructure, Mineralogy, and Strength Parameters
Kim, Youngmoon ; Lee, Jongsub ; Lee, Jooyong ; Lee, Changho ;
Journal of the Korean Geoenvironmental Society , volume 14, issue 5, 2013, Pages 49~56
The necessity of exploration in deep sea increases to develop the natural resources. The deep marine sediments, which were recovered from the hydrate occurrence regions during the Ulleung Basin Gas Hydrate Expedition 2 (UBGH2), East Sea, Korea in 2010, are explored to obtain the geotechnical characteristics and strength parameters. The index properties of the specimens including the atterberg limits, specific surface, and particle size distribution are measured and compared with the previous studies. X-ray diffraction, scanning electron microscope, and X-ray energy dispersive spectroscopy are conducted to analyze the clay mineralogy, chemical composition, and microstructure of the sediments. Strength parameters and shear wave velocities are measured with the axial strain by using an instrumented triaxial device. The strength parameters estimated by empirical equations are compared with the experimental results.
Statistical Characteristics of Diazinon Degradation using E-beam
Lee, Sijin ;
Journal of the Korean Geoenvironmental Society , volume 14, issue 5, 2013, Pages 57~63
In this study, the characteristics of degradation and mineralization of diazinon using a statistical approach based on Box-Behnken design (BBD, one of response surface method) was investigated in an E-beam process, and also the main factors with diazinon concentration (
), irradiatin intensity (
) and pH (
) which consisted of 3 levels in each factor was set up to determine the effects of factors and optimization. At first, effects of pH and diazinon concentration were investigated to determine the proper range of application on response surface method(RSM). In statistical approach, the regression analysis and analysis of variance (ANOVA) were applied to evaluate the quantitative comparison of each factors in order to obtain the effects were irradiation intensity>diazinon concentration>pH. The regression model predicted the optimization point using the response optimizer to consider the effects of operation conditions were
and 95.7% of diazinon degradation, 41.8% of TOC reduction at 12.75mg/L and 4.26kGy, respectively. The pH condition was not significantly affects on E-beam process than other advanced oxidation processes (AOPs).