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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 12, Issue 12 - Dec 2011
Volume 12, Issue 11 - Nov 2011
Volume 12, Issue 10 - Oct 2011
Volume 12, Issue 9 - Sep 2011
Volume 12, Issue 8 - Aug 2011
Volume 12, Issue 7 - Jul 2011
Volume 12, Issue 6 - Jun 2011
Volume 12, Issue 5 - May 2011
Volume 12, Issue 4 - Apr 2011
Volume 12, Issue 3 - Mar 2011
Volume 12, Issue 2 - Feb 2011
Volume 12, Issue 1 - Jan 2011
Selecting the target year
A Case Study on Reinforcement Method by Excavation Adjacent to the Subway Tunnel using Numerical Analysis
Byun, Yo-Seph ; Jung, Kyoung-Sik ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 5~11
Recently, large and deep excavations are increasing. The damage of adjacent structures due to excavation has steadily increased with increasing construction demand. Especially in urban development and poor conditions, the excavation adjacent to the subway structures has caused a lot of problems. This paper was reviewed that the underground excavation and reinforcement of the status process through a case study on the field. And stability analysis through the case study evaluates applicability for reasonable reinforcement method by numerical analysis. As a result, the strata distribution condition of all 16 sites consisted of landfill from the top and distributed in the order of deposits, weathered soils, weak rock from the bottom. Also, when proceeding the excavation adjacent to structures, the location of site and layer conditions have highly effect on the results of the construction. Therefore, this study was applied reinforcement method to protect damage by excavation. Displacement and settlement were within allowable criterion and hence, stability of structure was analyzed as safe.
A Study on the Evaluation of Expanded Metal Characteristics for Application Rockfall Facilities
Lee, Jong-In ; Jung, Chun-Gyo ; Kim, Sung-Ho ; Hwang, Yeong-Cheol ; Lee, Seung-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 13~20
There are many mountains in Korean Peninsula, and those used for the construction of roads and railways sectors are forming slopes. Slope collapse occurs with falling rocks and landslide because of the relaxation of the thawing rocks. The heavy rain in summer can also significantly contribute to the process, and abnormal climate change is much more influential than before. Therefore, rockfall-related accidents in rainy season are easily accessible in media every year. There has been a lot of research on application of strengthening compensation of the sections in order to minimize casualties and property damage. Rockfall Protection Net, however, has not been focused on much in the field yet. This study highlights the need of Rockfall Protection Net, since it can segregate the falling rocks inside the net relatively safely. Although there has been a little doubt about the effectiveness of rockfall protection facilities, it is obvious that relevant studies dealing with the solidity of the net are necessary for the rockfall protection net to be capable of supporting rockfall energies. As a result, Expanded metal strength is much more durable compared to the PVC coating net, and it is regarded as an excellent alternative material for the Rockfall Protection Net. In this study, the applicability of Expanded Metal as the alternative of Rockfall Protection Net is verified experimentally.
Characterization of Illegally Dumped Wastes in Riversides of Nakdong River
Kim, Young-Sug ; Choi, Bo-Ram ; Lee, Won-Tae ; Kang, Sung-Won ; Ahn, Kwang-Ho ; Lee, Tae-Yoon ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 21~25
This study was performed to evaluate characteristics of illegally dumped wastes in the riversides of Nakdong river found during dredging of Nakdong river. Precise classification of the wastes found in the riversides is essential to proper treatment of the wastes. We tried to determine whether these wastes contained toxic compounds and stabilized. Wastes were found at 27 sampling points out of 159 segments investigated and these wastes were not classified as toxic wastes. In addition, clay soils were found at 60 sampling points, and these soils were not classified as wastes. Thus, these soils are thought to be recycled as construction materials. Some samples were not stabilized, which means biodegradation was still progressed in these areas.
The Study of Deformation Characteristics into Landfill and Underground Pipe using CLSM
Nam, Seung-Hyeok ; Chae, Hwi-Young ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 27~33
In the case of the existing method of underground pipe construction, the difficulty of the bedding compaction of pipe causes reducing the compaction efficiency and the stability of the underground facilities and conclusively damaging the structures. One of the methods to solve these problem is using the flowable fills as a backfill material. Therefore, in this study, numerical analysis of the underground pipe was performed in order to evaluate the behavior of pipe according to backfill mixtures. To estimate the deformation characteristic of the underground pipe, the displacement of the main part of the pipe, ground settlement and vertical earth pressures were measured in different backfill mixtures and maintaining the other conditions constantly. As a result of numerical analysis, using the flowable fills as the backfill material is better than using sand in reducing the ground settlement, the pipe deformation and the vertical earth pressure aspect.
Model Experiments and Behavior Analyses of The Tunnel Support Using TDR Sensor
Park, Min-Cheol ; Han, Heui-Soo ; Cho, Jae-Ho ; Yang, Nam-Young ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 35~45
This paper is to analyze the behaviors of tunnel support by TDR(Time Domain Reflectometry) sensor using electrical pulse. To analysis the behaviors of tunnel support, Copper tape as sensing materials was studied for on-site installation. Copper tape to the top of the glass tape, foam tape, and shielding the lower part was used electromagnetic shield sheet. For a high sensitivity to load and fill out the measurement noise emissions has been developed for the production of materials. This sensing material through the tunnel model tests for the change by surcharge load in TDR data were analyzed. Varing stiffness and support of conditions were determined the change of TDR data through PVC pipe tunnel section model tests. By comparing TDR data and finite element analysis, the behaviors of the tunnel support materials were analyzed qualitatively.
A Study on Quantity of Shotcrete Sprayed in a NATM Tunnel Based on Field Measurements
Lee, Cheol-Ju ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 47~54
This study has analysed overbreaks, shotcrete rebound and the ratio between the actual quantity of shotcrete sprayed compared to designed quantity measured during a NATM tunnel construction. Based on the measurements of size of the excavated tunnel faces, an average overbreak was about 28.5 cm, which is about 260% of allowable overbreak. The measured shotcrete rebound was about 7.2% in average which is about half the allowable rebound(15%). In addition, due to overbreaks and rebound the actual quantity of shotcrete used in the tunnelling work was about 116.5 % of the designed value. It has been found from the field measurements that the quantity of shotcrete showed some relation with rock mass rating(RMR) and the standard guideline of tunnel supports, but the size of overbreak showed less correlation with RMR and the standard guideline of tunnel supports. Hence, the current tunnel design specifications stating the size of overbreak based entirely on the standard guideline for tunnel supports should perhaps be reestablished. The insight into the design guideline regarding overbreak and actual quantity of shotcrete will be reported and discussed.
The Study of Statistical Optimization of MTBE Removal by Photolysis(UV/
Chun, Suk-Young ; Chang, Soon-Woong ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 55~61
This study investigate the use of ultraviolet(UV) light with hydrogen peroxide(
) for Methyl Tert Butyl Ether(MTBE) degradation in photolysis reactor. The process in general demands the generation of OH radicals in solution at the presence of UV light. These radicals can then attack the MTBE molecule and it is finally destroyed or converted into a simple harmless compound. The MTBE removal by photolysis were mathematically described as the independent variables such as irradiation intensity, initial concentration of MTBE and
/MTBE ratio, and these were modeled by the use of response surface methodology(RSM). These experiments were carried out as a Box-Behnken Design(BBD) consisting of 15 experiments. Regression analysis term of Analysis of Variance(ANOVA) shows significantly p-value(p<0.05) and high coefficients for determination values(
=94.60%) that allow satisfactory prediction of second-order regression model. And Canonical analysis yields the stationery point for response, with the estimate ridge of maximum responses and optimal conditions for Y(MTBE removal efficiency, %) are
=25.75 W of irradiation intensity,
=7.69 mg/L of MTBE concentration and
/MTBE molecular ratio, respectively. This study clearly shows that RSM is available tool for optimizing the operating conditions to maximize MTBE removal.
Property Change of Solution by Pulsed Electric Field Treatment
Choi, Seung-Pil ; Kim, Chan-Soo ; Kim, Jong-Oh ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 63~69
The objective of this study is to investigate the change of physicochemical properties of humic acid, surfactants and water by pulsed electric field treatment. Critical micelle concentration(CMC) of surfactants and physicochemical properties of water were determined by the conductivity measurement, FT-IR and NMR, respectively. In electric field processing, structural changes of C-N complex and C=O were founded by FT-IR analysis. The increase of Hertz wave was in the range of 2.3 to 9.9 Hz in NMR analysis. CMC of cation and anion surfactant decreased to 1.3% and 9.2%, respectively, while the value of UV-vis increased. UV-vis of humic acid decreased by pulsed electric field. Therefore, application of pulsed electric field systeme was directly indicated to influence the physicochemical properties of water and organic compounds.
Mechanical Properties of Lean-mixed Cement-treated Soil for Effective Reuse of Dredged Clay
Kwon, Young-Cheul ; Lee, Bong-Jik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 71~78
Cement treating technique, such as deep mixing method, has been used widely to stabilize the dredged clayey soil for many years. Despite of its effectiveness in treating soil by cement, several efforts have also been made to try to reduce the side effect of the cement that used to stabilize the dredged clay. However, authors considered that more detailed study on the physical and mechanical properties of lean-mixed soil-cement has been required to establish the design procedure to apply the practical problems. Therefore, in this study, the curing time and mixing ratio was used as key parameters to estimate the physical and mechanical properties including long-term behavior. The unconfined strength of lean-mixed soil-cement increase continuously during curing period, 270 days, while increasing rate becomes low in ordinary cement-treated dredged clay. We also concluded that cement-treated dredging clay shows apparent quasi overconsolidation behavior even in low cement proportion. By this study, fundamental approach was carried out for effective reuse of very soft dredged clayey soil both in mechanical and environmental aspect. It can be also expected that this study can propose a basic design data to use the lean-mixed soil cement.
Application of Grouting for Liquefaction Resistance Using Automatic Grouting System
Kong, Jin-Young ; Kang, Jun-O ; Cho, Hyun-Soo ; Kim, Jin-Chun ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 9, 2011, Pages 79~87
This study conducted the research on the method of grouting quality management and the improvement effect by applying grouting construction's quality management technology to automatic injection management equipment through measure of liquefaction based on the case of reinforcement applying grouting at the region where liquefaction happened at section 12 site of highway construction. The pressure(p), speed(q), grouting penetration radius(R) value from injection pressure, injection speed, characteristics of grain size, and characteristics of viscosity through p-q-t chart analysis was applied to the automatic grouting system which could improve the quality management of grouting. Standard penetration test results after injection showed that N values represented 5-20 and the prevention of liquefaction became possible.