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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geoenvironmental Society
Journal Basic Information
Journal DOI :
Korean Geo-Environmental Society
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Volume & Issues
Volume 9, Issue 7 - Dec 2008
Volume 9, Issue 6 - Oct 2008
Volume 9, Issue 5 - Aug 2008
Volume 9, Issue 4 - Jun 2008
Volume 9, Issue 3 - Apr 2008
Volume 9, Issue 2 - Feb 2008
Volume 9, Issue 1 - Jan 2008
Selecting the target year
Numerical Modeling of Reinforced Soil with Waste Tirecell
Yoon, Yeo-Won ; Kyeon, Kwang-Soo ; Yoon, Gill-Im ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 5~12
In this research, the plate load tests on sand which is reinforced by Tirecell mat were simulated by finite element method (FEM). Tirecell mat made by waste tires has the same function and similar shape to Geocell for soil reinforcement and it can also be used for civil engineering structure. The results were compared with those of field plate load tests for evaluation of suitability of modeling method. From the comparison of both results, it can be seen that the settlements by FEM were very similar to test results with small margin under the ultimate bearing capacity. For the ultimate bearing capacities of two results, difference was very small. After the confirmation of the modelling, reinforcing effects with variation of cover depth and number of reinforcement layers by Tirecell were analyzed additionally. Reinforcing effect decreases with increasing soil cover depth, and this is similar to previous test results by soil cover depth. As the number of reinforcing layers increased, reinforcing effect increased. However at more than 2 reinforcing layers, reinforcing effect was negligible. In conclusion, the modeling method in this research might be used for analysis of reinforced structures using Tirecell mat.
Assessment on Environmental Stabilization of Used Open Dumping Landfill - A Case Study of Kamkok Landfill -
Park, Sang-Chan ; Cho, Byeong-Real ; Jeong, Ji-Hye ; Lee, Min-Hee ; Kim, Tae-Young ; Park, Jong-Ho ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 13~19
The objectives of this paper are to investigate states of these open dumping landfills for managing, utilizing and stabilization of a municipal solid waste landfill site in environmentally secure conditions. The result of the physical analysis of the landfill showed that it is composed of between 29.72-63.84% organic matter, 32.88% vinyl plastic. The environmental assessment of the landfill site confirmed that the landfill is at a maturation phase due to 0.18 of
/CODcr of leachate. VS and FS of TS Was respectively 30.37%, 32.34% and C/N ratio was 21.8. Surface water around landfill was BOD 10.7 mg/g, SS 37.8 mg/g, E-Coli 31,157(MPN/
) and Ground water was
1.025-4.075 mg/g. Leachat indicated T-P 0.002-0.028 mg/g,
4.0-21.0 mg/g. The soil contamination of around landfill didn't appear as below of the regulation of Soil Environment Conservation Act. The Landfill Gas was
6.17%, H2S and CO was not detected. Also Surface Water was not detected
A Study on the Engineering Characteristics of Soil - Fly Ash - Bentonite Liner
Lee, Chang-Hwan ; Kim, Myeong-Kyun ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 21~29
As household and industrial wastes continue to rapidly increase every year, the demands for landfill sites are also increasing. However, the construction of landfill sites causes many problems due to the high costs of liners, while the leachate from the landfills generates secondary contamination of surrounding lands and groundwater. The purpose of this study is to determine the proper mixing ratio to meet the liner conditions (must be less than
), using the local soil as the main material and using fly ash, bentonite, and cement as the mixing materials. The possibility of using this mixture as the liner for landfill sites was examined. To determine the proper mixing ratio, this study conducted basic physical properties tests, compaction tests, consolidation tests, and uniaxial compression tests. It was found that the higher the ratio of bentonite, the lower the coefficient of permeability, and the higher the ratio of fly ash, the higher the coefficient of permeability. The reason for this is that, while bentonite expands and fills pores, fly ash cannot fill the pores because the particles have a round shape and do not have adhesion. In conclusion, the optimum coefficient of permeability that meets the landfill liner condition was obtained when the ratio of bentonite was 15% or higher. If fly ash was mixed, the landfill liner condition was met when the ratio of bentonite was 15% or higher and the ratio of fly ash was 20% or lower.
Evaluation of Constitutive Relationships and Consolidation Coefficients for Prediction of Consolidation Characteristics of Dredged and Reclaimed Ground
Jun, Sang-Hyun ; Yoo, Nam-Jae ; Park, Byung-Soo ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 31~41
Consolidation characteristics of reclamated ground with dredged soil and methods of evaluating them are investigated in this paper. For a dredged and reclamated ground with a very high water content, self-weight consolidation being progressed, its consolidation characteristics are difficult to find since it is almost impossible to have a undisturbed sample. In order to overcome such a problem, methods of laboratory tests with disturbed sample were studied to obtain consolidation parameters required to analyze consolidation settlement in practices, using the conventional infinitesimal consolidation theory, were evaluated by carrying out various laboratory tests with disturbed soils such as oedometer test, constant rate of deformation test, Rowe-cell tests with ring diameters of 60 mm, 100 mm and 150 mm and the centrifuge model tests with 40 g-levels. Constitutive relations of void ratio - effective vertical stress - permeability were evaluated by using the inverse technique implemented with the finite strain consolidation theory and results of centrifuge model tests. Design soil parameters related to consolidation such as compression index, swelling index, coefficient of volume change and vertical and horizontal consolidation coefficients were proposed properly by analyzing the various test results comprehensively.
Suggestion of Estimating Method for Net Primary Production in the Geum River Basin Using NDVI
Shin, Sha-Chul ; Beak, Sung-Cheol ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 43~51
This study is to evaluate the NPP (Net Primary Production) distribution in the Geum River basin from NOAA/AVHRR satellite imagery data. It is supposed that the natural vegetation condition and the NPP has the linear relationship. The NPP from natural vegetation increases proportional to the annual net radiation (Rn), where radiative dryness index (RDI) is a proportional constant connecting net radiation to NPP. Normalized Difference Vegetation Index (NDVI) is used for monitoring vegetation change, and iNDVI (integrated NDVI) for annual analysis. The iNDVI has a close relation to Rn and NPP, which can be used effectively for estimating NPP distribution of where the meteorological data is unavailable. The purpose of this study is to propose a simple method to get NPP in the Geum river basin.
Finite Strain and Nonlinear Consolidation Analysis Considering the Effect of Strain Rate Dependency on Clay
Lee, Bong-Jik ; Lee, Heung-Gil ; Kwon, Young-Cheul ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 53~60
In recent years, finite strain consolidation theories including a mechanical nonlinearity and a reasonable coordinate system have been proposed and used in educations and practical consolidation problems. However, despite their reasonable ability to predict the consolidation behavior, their failure in the field can be attributed to the complexity of estimating and selecting proper parameters for simulating the consolidation phenomenon. In this study, therefore, the application of a piecewise-linear method was proposed to solve such problems including the assumption of the uniqueness in compressibility. Especially, the concept of reference curve was introduced to define the effect of strain rate dependency of clay. The applicability of the methodology is verified by several tests. It was found that the proposed method is applicable in restrictive ranges of study carried out in the laboratory. Finally it is expected that the verification in field consolidation problem has to be carried out through future study.
The Characteristic for Undrainded Shear Behavior of in Low-Plastic Silt and its Prediction
Kim, Dae-Man ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 61~70
In this study, undrained triaxial (CU) tests were performed on low-plastic silt of Nakdong River in order to investigate the undrained shear behavior of low-plastic silt. In experimental results, the deviator stress showed the hardening behavior after reaching its yield stress like the tendency of common sand, and the pore water pressure was gradually decreased to critical state after the maximum value. In the effective stress paths, regardless of consolidation stress or overconsolidation ratios, both a critical state line (CSL) and a phase transformation line (PTL) exist in the effective stress path that is similar to the case of sand. The behavior of low-plastic silt was predicted by the Modified Cam-Clay (MCC) model, the Jordan and the Elman-jordan model that is artificial neural network model. According to predicted results, the overall undrained shear behavior of low-plastic silt could not be predicted with the MCC model, but the Jordan and Elman-Jordan model showed well-matched experiment results.
A Study on the Deformation Behavior of the Underground Pipe under the External Load
Yoo, Han-Kyu ; Park, Eon-Sang ; Kim, Dong-Ryul ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 6, 2008, Pages 71~79
The underground conduit laid under different environments exhibits various behaviour according to the ground and external load as well as the loading time and conditions, so on. As the environmental conditions are usually different even within the same area, it is very difficult to correctly predict the stress conditions and behaviour of the underground conduit using currently available theoretical analysis. Especially, it is not yet satisfied in Korea for the evaluation of the underground conduit under the influence of the load of vehicles or unexpected loading conditions. Thus, in this study the assessment for the excavation depth and ground disturbance was carried out with a large box model test and numerical analysis. Numerical analysis was also performed for the assessment of dynamic loading conditions like railway load.