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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 11, Issue 12 - Dec 2010
Volume 11, Issue 11 - Nov 2010
Volume 11, Issue 10 - Oct 2010
Volume 11, Issue 9 - Sep 2010
Volume 11, Issue 8 - Aug 2010
Volume 11, Issue 7 - Jul 2010
Volume 11, Issue 6 - Jun 2010
Volume 11, Issue 5 - May 2010
Volume 11, Issue 4 - Apr 2010
Volume 11, Issue 3 - Mar 2010
Volume 11, Issue 2 - Feb 2010
Volume 11, Issue 1 - Jan 2010
Selecting the target year
Static Behavior of Gravelly Soil with State Parameter
Heo, Seung-Beom ; Yoon, Yeo-Won ; Kim, Woo-Soon ; Kim, Jae-Youn ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 5~14
Recent researches on the behavior of gravelly soils have been focused mainly on the relative density or on the gravel content. And some researchers presented the liquefaction behavior based on the relative density whereas others based on the gravel content of gravelly soil. However the relative densities vary with gravel content and relative density is not enough to fully express the behavior of gravelly soils. Therefore in this research state parameter which considers void ratio and effective confining pressure is introduced and Steady State Line(SSL) of gravelly soils for various gravel content are determined by undrained triaxial tests in order to express the behavior of gravelly soils. From the research the position of SSL moved downward with gravel content. And the same density of soil showed dense sand behavior or loose sand behavior depending upon the confining pressure. Especially relative density 80% of gravelly soil showed loose sand behavior under high confining pressure. However the gravelly soils with similar state parameters showed similar stress behaviors. It can bee seen that state parameter is useful tool to evaluate undrained behavior of gravelly soils. Also state parameter and undrained strength showed good correlations.
Hazard Prevention Using Multi-Level Debris Flow Barriers
Baek, Yong ; Choi, Young-Chul ; Kwon, O-Il ; Choi, Seung-Il ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 15~23
Debris flows are a natural hazard which looks like a combination of flood, land and rock slide. Large rainfall in July 2006 produced several large scale debris flows and many small debris flows that resulted in loss of life and considerable property and railway damage, as was widely reported in the national media. The hazard "debris flow" is still insufficiently researched. Furthermore debris flows are very hard to predict. Flexible Ring net barriers are multi-functional mitigation devices commonly applied to rock fall or floating wood protection in floods, snow avalanches and also mud flows or granular debris flows, if properly dimensioned for the process or processes for which they are intended. Overtopping of the barriers by debris flows and sediment transport is possible, supporting the design concept that a series of barriers may be used to stop volumes of debris larger than are possible using only one barrier. The future for these barrier concepts looks promising because these barriers represent the state of art for such applications and are superior to many other available options.
Treatment of Contaminated Groundwater Containing Petroleum and Suspended Solids Using DAF and Mixed Coagulation Processes
Lee, Chae-Young ; Jang, Yeong-Su ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 25~32
Contamination of soil and groundwater by the compounds of hydrocarbon petroleum has been widely accepted as the main cause that harms the environments and health. To remove those pollutants, absorbing clothes, activated carbons, or oil-water separation devices with the gravity method are employed for treatment. However, those materials and devices cannot remove the emulsion pollutants despite of their efficiency for removing free products. Therefore, we investigated the problems which occur during the groundwater treatment for the highly concentrated suspended solid particles, which can be resulted from excavation, and to propose methods to remove TPH(Total Petroleum Hydrocarbon). After coagulation experiment with high molecular polymers, the concentration of SS(Suspended Solids) and COD(Chemical Oxygen Demand) turned to satisfy the groundwater quality criteria within 5 minutes while the concentration of TPH failed to meet the water quality standard of effluent. Consequently, the water quality criteria for effluent could not be met by single DAF(Dissolved Air Flotation) process. However all water quality criteria could be satisfied after 20 minutes when coagulation reactions are carried out simultaneously in the DAF reactor.
Evaluation of Basic Unit for Non-point Pollutants in Runoff of West Coast Highway - Maesong Area
Park, Se-Yong ; Mo, Kyung ; Kim, Lee-Hyung ; Kang, Hee-Man ; Kim, Moon-Il ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 33~40
In this study, evaluation of basic unit of non-point pollutant, which is fundamental evaluation of non-point loading, was conducted using both road point and angle of intersection point in Maesong area, West coast highway by utilizing Event Mean Concentrations(EMC). Concentration of pollutants except heavy metals at these two points rapidly decreased in 30 minutes after start of runoff. According to the results of EMC, for both sampling points, it was determined that the concentrations of TSS(Total Suspended Solid),
(Biological Oxygen Demand), and DOC(Dissolved Organic Carbon) were higher than those of wastewater effluent standard in Korea, however, the concentrations of T-N(Total Nitrogen) and T-P(Total Phosphorus) were lower than those of the standard. In terms of heavy metals, Fe, Pb, and Zn showed higher concentrations than others. When compared with the units established by the Ministry of Environment in Korea, the basic units of
and T-N in this study were lower. On the other hand, when compared with foreign units, Cu, Pb, and Zn showed approximately 10 times higher concentrations. It was estimated that a long term monitoring should be conducted for obtaining additional data and more reliable basic units for the non-point pollutnats based on the results from this study.
Oxidation of Organics Using a Direct Reaction of Peroxyl Radical and Ozone
Cho, Seung-Pil ; Kim, Jong-Oh ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 41~47
This study was conducted to assess the applicability of pilot scale system and to evaluate the treatment efficiency on operational parameters such as humic acid concentration, initial pH and air flow rate on the ozone/peroxyl radical reaction system. The decolorization of ozone/peroxyl radical system was higher than that of only process. Removal efficiency of ozone/peroxyl radical system was generally increased with the increase of intial concentration of humic acid but decreased over the range of 30mg/L. Treatment efficiency of HA at acid pH was smaller compared to that of neutral or basic pH and increased with increasing the air flow rate from 1L/min to 3L/min. In pilot-scale test, average removal of TOC and
was about 70% and 60%, respectively and ozone/peroxyl radical reaction system was indicated a potential in water treatment application.
A Study on Pillar Behavior of Twin Parallel Tunnels by Numerical Approach
Byun, Yo-Seph ; Kim, Hyun-Gi ; Lee, Sang-Su ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 49~55
Safety estimation of the pillar between parallel tunnels are very important considering stress concentration in case the piller width is not enough to secure the stability. Pillar width needs to be determined properly because of the progressive failure-risk of pillar due to stress-concentration. In this research, the effect of element size in numerical analysis was evaluated based on that yield pillar's stability and proposed systematic analysis about pilar's stability examination. In consequence of it, element size does not give any effect on intensity stress ratio. On the other hand, the analysis using the smaller element size results in lower safety factor in strength reduction technique. In case of the weathered re.k on the main ground layer, the analysis of result was not reliable. In conclusion, the smaller element size is, the more stable factor is.
A Study on Design of Containment Area Considering Suspended Solid Sedimentation
Jee, Sung-Hyun ; Huh, Byung-Joo ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 57~63
For optimum scale design of containment area, a series of laboratory tests using column were performed in this study as followings; sedimentation test and self-weight consolidation test for dredged soil, and suspended solid concentration test for supernatant. Containment area has been designed and evaluated, based on field condition and concentration of suspended solid of effluent water. In addition, the relation between width of containment area and target concentration of suspended solid was analyzed. The results show that concentration of suspended solid decreases as the width of containment area decreases and the length of containment area increases. It was also observed that influence of change in ponding depth should be considered to predict the change in suspended solid concentration in supernatant discharged as disposal is conducted; the lower target suspended solid concentration of effluent water, the more important.
Biodegradation of Potential Diesel-Oxygenate Additive Including DBM(DiButyl Maleate)
Chang, Soon-Woong ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 65~71
In this study, we have evaluated biodegradability of diesel-oxygenates including DBM and gasoline-oxygenates having similar physio-chemical properties using indigenous aerobic microorganisms from a diesel-contaminated soil. Toluene and Ethanol have shown higher biological activity and the first-order degradation rate constants ranged around
. However, MTBE, gasoline-oxygenate has shown as a limited substrate. Moreover, As increased initial concentrations of DBM and TGME, degradation rates of those were decreased relatively. As a strategy to evaluate biodegradability of DBM and TGME, reduction of diesel-oxygenates,
production and toxicity by algae were monitored. This results indicated possible mineralization of diesel-oxygenates, But we could predict that residual byproduct produced even though complete consumption of diesel-oxygenates were observed if algal toxicity variation considered. In conclusion, it is the first report that diesel-oxygenates including DBM could be biodegraded effectively by indigenous soil microorganisms and this result increased the possibility of bioremediation technology to apply into oil-contaminated sites.
Verification of Applicability of Buried GFRP Pipe through Numerical Analysis
Kim, Hong-Taek ; Kwon, Hyuk-Joon ; Yoon, Myung-June ; Yoon, Soon-Jong ; Han, Yeon-Jin ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 73~82
The GFRP(Glass-Fiber Reinforced Plastic) pipe is designed to behave safely against the external forces and to secure stability of deformation and settlements of pipe, since it is laid under the ground. In this study, the evaluation for the pressure stability was carried out by performing the laboratory experiments to figure out the mechanical properties of Glass-Fiber Reinforced Plastic pipe, take a theoretical approach, and suggest the mechanical properties necessary for the analysis and design of GFRP. Numerical analysis is also conducted to evaluate on the field application through the comparison concerning relations between deformation and differential settlement in the GFRP and hume pipes when all and half sections are under the surcharge load.
A Case Study on the Slope Collapse and Reinforcement Method of the Phyllite Slope
Cho, Young-Hun ; Lim, Dae-Sung ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 8, 2010, Pages 83~93
The purpose of this study is to present emergency rehabilitation, cause and the countermeasure of reinforcement about reinforced retaining wall and the slope collapse of the phyllite ground. The study area is broken easily because this area has rock mass discontinuity such as stratification, foliation, joint and fold. And this area consists of the ground where it happens easily to the failure of structure like reinforced retaining wall because of the phyllite ground sensitive to weathering. Counterweight fill in front of reinforced retaining wall was performed as emergency rehabilitation about displacement of reinforced retaining wall and the failure at the rear of slope on phyllite ground. After that, additional displacement didn't occur. Boring and geophysical exploration were launched to present emergency rehabilitation and develop the long-term method of reinforcement. This could grasp anticipated range of the failure section and identify internal and external factors of the cause of the slope collapse. Several methods of reinforcement were suggested by conducting the numerical analysis. When conducting design and construction of major structures at the ground which has complex discontinuities, the precise site investigation should be conducted. During construction, immediate action for over-displacement should be taken by performing the periodic measurement.