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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Geoenvironmental Society
Journal Basic Information
Journal DOI :
Korean Geo-Environmental Society
Editor in Chief :
Volume & Issues
Volume 7, Issue 6 - Dec 2006
Volume 7, Issue 5 - Oct 2006
Volume 7, Issue 4 - Aug 2006
Volume 7, Issue 3 - Jun 2006
Volume 7, Issue 2 - Apr 2006
Volume 7, Issue 1 - Feb 2006
Selecting the target year
Removal of Nitrogen and Phosphorus in Anaerobic Fermentation Supernatant by Struvite Crystallization
Kim, Jongoh ; Jung, Jongtae ; Kim, Harkkyun ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 5~12
This study was conducted to investigate the effect of operational parameters such as dosage of magnesium and phosphate, pH, reaction time and existence crystal core for the removal of nitrogen and phosphorus in anaerobic fermentation supernatant by struvite crystallization. Optimal mole ratio of
was 1.2:1.0:1.2. Under the optimal molar ratio, removal ratio and reaction rate constant of
were 79.2, 96.8%, 0.157 and
, respectively. Optimal pH and reaction time were 11 and 10 minutes, respectively, in the optimal molar ratio. Residual concentration of
showed lowest value with 1 g/L of crystal core addition. SEM analysis of struvite crystallization with crystal core showed higher crystal core growth than that of without crystal core. Struvite precipitate proved to be orthorhomic crystal structure by XRD analysis.
Behavior of Geotextile Tube Composite Structure by 2-D Limit Equilibrium and Plane Strain Analysis
Shin, Eunchul ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 13~22
The geotextile have been used in filtration and drainage for over 30 years in many applications of civil and environmental projects. Geotextile tube is compound technology of filtration and drainage property of geotextile. Geotextile have been used for various types of containers, such as small hand-filled sandbags, 3-dimensional fabric forms for concrete paste, large soil and aggregate filled geotextile gabion, prefabricated hydraulically filled containers, and other innovative systems involving containment of soils using geotextile. They are hydraulically filled with dredged materials. It have been applied in coastal protection and scour protection, dewatering method of slurry, and isolation of contaminated material. Recently, geotextile tube technology is no longer alternative construction technique but suitable desired solution. This paper presents the behavior of geotextile tube composite structure by 2-D limit equilibrium and plane strain analysis. 2-D limit equilibrium analysis was performed to evaluate the stability of geotextile tube composite structure for the lateral load and also the plane strain analysis was conducted to determine the design and construction factors. Based on the results of this paper, the three types of geotextile tube composite structure is stable. And the optimum tensile strength of geotextile is 151kN/m and maximum pumping pressure is 22.7kN/m.
Evaluation of Stability for Settlement Free Reinforced Earth Retaining Wall by Centrifuge Model Tests
Ahn, Kwangkuk ; Bae, Wooseok ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 23~34
In this study, the centrifugal tests were performed to evaluate the behavior of reinforced retaining wall that allows the settlement of reinforcement strip. To analyze the stability of reinforced retaining wall, which drives the settlement of reinforcement strip, the results were compared with the conventional reinforced retaining wall. In the centrifugal tests, the aluminum plate for the face was used and the aluminum foil was used as a reinforcement. The decomposed granite soil was adopted as a backfill. As a result, the settlement free reinforced retaining wall reached to the failure at 80g-level. In contrast, the conventional reinforced retaining wall was collapsed at 69g-level. It means that the settlement free reinforced retaining wall has the stronger stability than the conventional reinforced retaining wall. Also, vertical earth pressure of the settlement free reinforced retaining wall near the base of wall was higher 16% than that of the conventional reinforced retaining wall.
Geophysical Prospecting for Geothermal Resources at Northern Part of Kumseongsan, Euiseong
Lee, Gidong ; Han, Kihwan ; Kim, Kibeom ; Lee, Jongmoon ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 35~44
Various geophysical methods and geological survey were applied for prospecting of geothermal resources and the attitude of volcanic body at northern part of Kumseongsan, Euiseong. They include magnetic, self-potential, radioactive and resistivity methods, temperature logging near the earth's surface and geological survey. The results of this study are summarized as follows. Various geophysical anomalies is related to the geologically Cretaceous conduit. Anomalies of resistivity and temperature logging seem to be related to the geological structure and terrestrial heat. Small radioactive and self-potential anomalies seem to be associated with chemical character of rocks. The sedimentary rocks dip steeply toward the volcanic rocks, aquifuge. Ideal geological structure for bearing ground water and geothermal resources was founded in the study area. The study area and the adjacent two hot springs area consist of Cretaceous sedimentary and volcanic rocks, and have similar geology.
An Engineering Characteristics of Weathered Granite Soil-Bentonite Mixtures
Kim, Daeman ; Kim, Kiyoung ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 45~56
Recently, the more potential waste sites are being required as increasing the demand of better human life. But the construction of waste disposals has many restrictions because of lack of good quality clay and high cost of liners. So, in this study, we studied the liner materials to develop more cheaper soil liner that can be satisfied the environmental criterion for the coefficient of permeability and shear strength. A series of compaction test and triaxial (consolidation, permeability, and shear) tests were performed to obtain the optimized weight ratio of Bentonite-Soil mixture (B/S) including the least amount of bentonite. A series of soil tests were performed to acquire the appropriate weathered granite soil-bentonite mixture that is satisfied the environmental criterion of soil liner(
). At first, weathered granite soils were classified with four different particle-size soils, and B/S ratio was increased as 5% step for each particle-size. The test results showed that in case of weathered granite soil passing through No. 100 sieve, B/S=15% satisfied the soil liner criterion. The measured coefficient of permeability and the Chapuis's two equations were also compared. And a predicting equation for the coefficient of permeability was suggested, which is suitable for the mixture soil with the B/S ratio used in this study. The optimal weight ratio for the mixture soils used in this study was 15% in the both cases of permeability and shear strength.
Water Quality Modeling of Stratification Lake Using WASP6 Model
Lee, Wonho ; Han, Yangsu ; Kim, Jingeuk ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 57~65
In this study, WASP6 was used to predict the water quality of the reservoir and the lake. This can help the managers make the right choice of water quality policy. The results through studying are below. Raw pollutant load caused by the tourists in pollutant load of the study area takes 91.66% and 92.75% in total amount T-N, T-P. It showed high value when compared to raw pollutant load by land and stock farm and it seems that the main contamination is the population of tourists. From the result of the prediction model, BOD will increase about 1.5 times, T-N and T-P will be 1.5 times in 2012. It means that some counter plan is needed to reduce pollutant load. Enviroment grade of Suokjeong reserver is in I~II grade which is in good condition comparatively. However, the water contamination will be in poor as the year passes. when considering T-N T-P, which are the nutrients to control eutrophication, the concentrated administration about contamination sources is in urgent.
Engineering Characteristics of Crushed Rock for Foundation and Backfill Materials of a Conduit
Moon, Hongduk ; Kim, Daeman ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 67~73
In this study, basic physical tests and mechanical tests of crushed rock were performed in order to investigate the field application of crushed rock as substitute materials of sand that is commonly being used as foundation and backfill materials of sewer conduit. Particle-size distribution curve of crushed rock is similar to sand and also it is well-graded soil than common sand. Maximum dry unit weight in proctor compaction test for crushed rock is higher than the values of common sand. So we can estimate that the crushed rock has advantages in workability than sand for the backfill compaction after construction of sewer conduit. When we investigate the results of direct shear test and triaxial compression test on the crushed rock, it has a similar value of shear strength parameters to sand at the same stress state and as time goes by, it tends to increase the unconfined compression strength. But, because the strength reaches at the constant value after 6~7 days, we expect that it can absorb the lateral strain of flexible conduit well. All the above experimental results just proves that crushed rock can substitute for sand as backfill materials and foundation of sewer conduit.
Numerical Evaluation of Buckling Strength for High-Strength Corrugated Steel Structures
Choi, Dongho ; Cho, Sunkyu ; Park, Sangil ; Moon, Eunkyung ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 75~88
This paper evaluates the feasibility of use of high-strength steel for soil-metal corrugated steel structures. Two specifications, the AASHTO(2004) and the CHBDC(2000), were compared and the scientific background of equations for the buckling stability in those specifications were investigated to figure out the governing factors for buckling strength of structures. Numerous finite element analyses for round-pipe type of soil-metal corrugated steel structures were carried out with considering the elastic-plastic relationship of a material and the geometrical non-linearity, as well as the various design variables, such as span length, depths of soil cover, section properties, tensile strength and backfill conditions. Buckling strength equation of the CHBDC(2000) is still valid and conservative for both normal and high-strength steel soil-metal corrugated steel structures, and the buckling strength increases with the use of hight-strengths steel.
Evaluation of Aseismic Performance for Reservoir Dams in Korea
Park, Innjoon ; Kim, Seungwook ; Jang, Woonghee ; Kim, Hyuntae ; Yoo, Chanho ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 89~100
Recently, lots of lives and properties have been lost because comparatively large magnitude earthquakes were occurred in relatively safe regions and nations. It has been reported that number of earthquakes was increased rapidly in Korea. Hence, recently civil constructions were ensured against risks about earthquake not only large-scale structures but also comparative small-scale structures such as reservoir dams and life line by systematic aseismic design. Therefore, in this study, the seismic stability was ensured to evaluate aseismic performance for major planned reservoir dams in Korea. The seismic response analyses were conducted using SHAKE program on new reservoir dams under short-period, long-period and artificial seismic wave. The liquefaction potential for reservoir dams was assessed by using results from seismic response analysis (simplified assessment method for liquefaction potential). Also, fully coupled analysis--interaction of pore-pressure and soil--was performed to investigate both the development of excess pore water pressure and the characteristic of dynamic shear strain.
An Analysis on the Behavior Characteristics of the Side of Drilled Shafts in Rocks
Lee, Hyukjin ; Lee, Hyungkyu ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 101~111
In case of drilled shafts installed by drilling through soft overburden onto a strong rock, the piles can be regarded as end-bearing elements and their working load is determined by the safe working stress on the pile shaft at the point of minimum cross-section or by code of practice requirements. Drilled shafts drilled down for some depth into weak or weathered rocks and terminated within these rocks act partly as friction and partly as end-bearing piles. The base resistance component can contribute significantly to the ultimate capacity of the pile. However, the shaft resistance is typically mobilized at considerably smaller pile movements than that of the base. In addition, the base response can be adversely affected by any debris that is left in the bottom of the socket. The reliability of base response therefore depends on the use of a construction and inspection technique which leaves the socket free of debris. This may be difficult and costly to achieve, particularly in deep sockets, which are often drilled under water or drilling slurry. As a consequence of these factors, shaft resistance generally dominates pile performance at working loads. The efforts to improve the prediction of drilled shaft pile performance are therefore primarily concerned with the complex mechanisms of shaft resistance development. In this study, the numerical analyses are carried out to investigate the behavior characteristics of side of rock socketed drilled shafts varying the loading condition at the pile head. The difference of behavior characteristics of side resistance is also evaluated with the effects of modelling of asperity.
A Study on Durability and Impermeability of Environmentally Friendly Inorganic Ground Injection Material
Chun, Byungsik ; Kang, Hyoungnam ; Do, Jongnam ; Lim, Jooheon ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 113~119
Recently, the ground injection method using water glasses as one of the main resources and the products of these constructions have basic problems in terms of the method of constructions for the permanent foundation reinforcement and stopping leakage of water because they have some serious problems such as durability, compressive strength, injectant eluviation and so forth even though they are still used to stop leakage of water in the temporary structures. The purpose of this study is to demonstrate the strength characteristic and environment friendliness of NDS method by unconfined compressive strenth test, permeability test, length change test, leaching test, and assessment of environmental impact in comparison water glass type material. The test results show that NDS method has significant improvement of strength, permeability, volume change, and leaching. An assessment of environmental impact also demonstrates that the NDS material is environmentally friendly.
A Study on the Reinforcement and Environmental Impact of LW Injection
Chun, Byungsik ; Do, Jongnam ; Sung, Hwadon ; Lim, Jooheon ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 121~131
This study is performed to examine the ground reinforcement effect and the environmental impact of LW injection, which is widely used during the excavation of high-rise apartment buildings. In addition, it proved that by conducting field exploration and laboratory test the engineering ground reinforcement effect of LW injection in the ground has low coefficient of permeability. The environmentally friendly aspect was evaluated through an assessment of environmental impact. The results of laboratory test shows that LW coagulating material with SC type soil structure has significant improvement of uniaxial compressive strength, increasing by three times and the shear strength increasing by twice, coefficient of permeability decreasing six to seven times. And the result of environmental impact tests show that from 6 hour after where the pH increases until 7.96 to initially it diminished, it started and to 80 hour after it recovered a pH 7.25 initially with 7.30. The chemical composition analysis test result that unpolluted water and polluted water hydrogen ion concentration (pH) show that the unpolluted water pH 7.36, polluted water pH 7.85, which is inside the Ministry of Environment standard of drinking water (the pH 5.8~8.5). The assessment of environmental impact and chemical analysis test also demonstrate that the LW coagulating material is environmentally friendly. In the
and the salinity detection test, it was proven that the salinity is slight and the
is not detected.
Numerical Modeling of Soil Liquefaction at Slope Site
Park, Sungsik ;
Journal of the Korean Geoenvironmental Society , volume 7, issue 6, 2006, Pages 133~143
A fully coupled effective stress dynamic analysis procedure for modeling seismic liquefaction on slope is presented. An elasto-plastic formulation is used for the constitutive model UBCSAND in which the yield loci are radial lines of constant stress ratio and the flow rule is non-associated. This is incorporated into the 2D version of Fast Lagrangian Analysis of Continua (FLAC) by modifying the existing Mohr-Coulomb model. This numerical procedure is used to simulate centrifuge test data from the Rensselaer Polytechnic Institute (RPI). UBCSAND is first calibrated to cyclic direct simple shear tests performed on Nevada sand. Both pre- and post-liquefaction behaviour is captured. The centrifuge test is then modeled and the predicted accelerations, excess porewater pressures, and displacements are compared with the measurements. The results are shown to be in general agreement. The procedure is currently being used in the design of liquefaction remediation measures for a number of dam, bridge, tunnel, and pipeline projects in Western Canada.