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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 10, Issue 7 - Dec 2009
Volume 10, Issue 6 - Oct 2009
Volume 10, Issue 5 - Aug 2009
Volume 10, Issue 4 - Jun 2009
Volume 10, Issue 3 - Apr 2009
Volume 10, Issue 2 - Feb 2009
Volume 10, Issue 1 - Jan 2009
Selecting the target year
An Experimental Study of the King Sejong Station and Siberian Frozen Soils
Kim, Young-Chin ; Shin, Jae-Won ; Son, Seung-Mo ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 5~12
Soil samples from the King Sejong Station in Antarctic and Vladivostok were tested in the laboratory and specific gravity, compaction curve, grain size distribution were determined. The effect of temperature change on the thermal conductivity, unfrozen water content, compressive strength were investigated. In addition, the change of tensile strength with temperature of the soil from Vladivostok was measured. Samples for the compressive strength test and tensional strength test were prepared in a mould with a fixed volume to prevent swelling. Also the effects of temperature and water content change on those strength were compared. Results from the thermal conductivity test showed that thermal conductivity values for both soils was larger at temperatures below freezing than those above freezing. The unfrozen water content dropped rapidly within a temperature range of 0~
and then gradually decreased further
. Compressive strength test results showed various stress/deformation curves with a change in water content. Sandy soil of the King Sejong Station had a much larger strength than ice at an identical temperature, while clayey soil of Vladivostok had a smaller strength than ice in the initial stage, but showed a larger strength at temperatures belows
. Tensile strength tests revealed an increase in the strength with a decreasing temperature.
Physicochemical Characteristics and Estimation of
Emission Rate from Municipal Solid Waste at the Environmental Facilities in Busan City
Lee, Tae-Yoon ; Kim, Do-Yong ; Kim, Jae-Jin ; Lee, Jun-Ki ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 13~20
There have been increasing interests in the odor generation problems as concerns about the quality of life has been increased recently. Especially, approximately 67% of the odor complaints from environmental facilities are those from sewage treatment facilities and food waste treatment facilities. Moreover, sewage ocean dumping will be prohibited from 2012 by the international and domestic ocean laws, and thus, demand for alternative management plans is increasing. Therefore, it was first selected 5 sewage treatment facilities and 5 food waste treatment facilities where the amounts of waste are relatively immense in Busan, and collect their sludge samples. Then it was investigated the samples' physical and chemical characteristics through proximate analysis, elemental analysis, XRF analysis, and calorific value analysis. Finally, estimate the
emission rates were estimated in order to apply the results as the basic data for providing the fundamental solution for the oder complaints. As a result, the concentration of
in sewage sludge and in food waste treatment facility were 57.3 mg/kg and 19.7 mg/kg in average, respectively. Finally, the units of
in wastes stored in total 10 waste treatment facilities was estimated 16,017,910.0 mg/d.
A Case Studty on the Ground Reinforcement and Waterproofing Effect of Weathering and Fault Zone by Special Injection Tip Equipment Using Microcement Type
Do, Jong-Nam ; Jung, Jong-Ju ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 21~28
A grouting method has been widely used in construction of large-scale structure to reduce permeability and reinforce the ground. If cement and grout material were not mixed well in the injection tip equipment, an opposite flow and interception state of the chemical grouting can occur. McG (Multi-mixing counterflow prevented Grouting, McG) method installed a special grouting device to allow better mixing of the grouting material(above fineness 6,000
/g) and prevent backward flow. The block of nozzle also diversify powder rate of cement. YSS (Youngil Special Silicate, YSS) that lowers
and thereby increases durability was developed by gel-forming reaction material. The seepage state and unconfined compressive strength of the injection material using the special injection tip equipment was tested in this study. The results of this study showed that the uniaxial compressive strength, permeability, N-value, TCR and RQD were improved by this method. Engineering characteristics obtained by the special injection tip method will be compared with those by the other method through various field tests from now on.
A Study of the Influence of Negative Skin Friction on Single Piles from Consolidation Analyses
Lee, Cheol-Ju ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 29~36
A series of two-dimensional (2D) finite element analyses have been performed to study the behaviour of single piles in consolidating ground. The analysis was conducted based on coupled analyses by considering changes of pore water pressure in the clay. In the analyses the soil slippage at the pile and the soil interface has been included. The method widely used in practice somewhat overestimates dragload by about 25% compared to the rigorous numerical analysis since partial mobilization of skin friction near neutral plane and reductions in the vertical soil stress is not incorporated. When soil slip develops at most of the pile length at the pile-soil interface during consolidation, further increases in dragload is not significant. Application of coating on the pile surface can reduce dragload and pile settlement substantially, but under an axial load on the pile head very large pile settlement can be developed unless pile tip is located to a stiff bearing layer.
Determination of Major Reduced Sulfur Gases Emitted from Wastes Stored in Environmental Facility Using GC/FPD
Lee, Tae-Yoon ; Lee, Jea-Keun ; Lee, Jun-Ki ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 37~43
With the economic development of Korea, sewage treatment facilities and waste food treatment facilities have been steadily increased. These facilities have positive effects such as the conservation of the water resources quality and waste food recycling while they also affect the neighborhood life with severe odor problems. Therefore, it was first collected sludge samples from 5 sewage treatment facilities and 5 waste food treatment facilities where the amounts of waste produced from above sites are relatively immense in Busan and estimate the
emission rates. Then it was selected 1 sample which has the highest emission rate of
. Using flux chamber and GC/FPD analyses, it was tried to quantify the emitted amount of sulfonic gas concentration under anoxic condition. The sludge sample obtained from Noksan sewage treatment facility has the highest emission rate of
. This sample contained 156.18 mg/kg
. The odor compounds were analyzed using GC/FPD and the concentrations were converted to odor quotient. Among odor compounds the ratio of
(methylmercaptan) for the total odor quotient was 47.3% and considered to be the main odor compound in the sample.
Behavior of Rapidly Expansion Materials for Maintenance Railroad Bed Subjected to Cyclic Loading
Lee, Jun-Dae ; Shin, Eun-Chul ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 45~50
The differential settlement may be generated by the variation of stresses caused by the soft ground or ground water. The cracks are usually created when the structures are leaned or deformed due to the differential settlement. A grouting method has been mainly used till now to improve the bearing capacity of the ground when the foundation of the structure is deformed by differential settlements. However, when this method is used, it takes too long time to obtain the required strength and the period of the reinforcement effect is not long enough. The advantage of GPCON injection method is to have good mechanical properties and durability, and easy construction. In addition, the GPCON method rapidly fills up the void in soils by injecting some materials into underground and also obtain the increase of bearing and shearing forces due to the expansion. In this paper the restoration capability of the foundation settlement of railway and subway subjected to cyclic loading is analytically and experimentally evaluated using the high density rapidly expansion GPCON in order to investigate the types of deformations and vibrational characteristics.
The Impermeable Effect for Bedrock Constructed by Grouting
Yea, Geu-Guwen ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 51~59
This study is based on field data obtained from rock grouting such as RQD value, Unit cement grout volume, Lugeon value(Lu), and Maximum grout pressure in four different dam sites. The relationship were analyzed and compared as follow. The cut-off effect after rock grouting in dam-foundation which are mostly consist of metamorphic rock is better than that of Sedimentary rock. And the impermeable effect after consolidation grouting is more efficiency than the impermeable effect after curtain grouting. The unit cement grout volume are increased as RQD value is higher in rock mass. But there is no relationship between RQD value and Lugeon value. In the sedimentary rock, which is more permeable than metamorphic rock, Lugeon value (Lu) is a linear function (Lu=0.22Vc) of unit cement grout volume (Vc). Cut-off effect of curtain grouting is less influential at each near holes which are already grouted than that of consolidation grouting. And the behavior characteristics of Lugeon value vs. the unit cement grout volume as the order of installations are almost the same.
A Numerical Study on Hydraulic Behavior in a Fractured Rock Medium with Hydromechanical Interaction
Jeong, Woo-Chang ; Park, Young-Jin ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 61~68
This paper presents the numerical investigation for the hydraulic behavior of a fractured rock mass with a hydromechanical interaction which may be considered during the in-situ hydraulic injection test. These experiments consist in a series of flow meter injection tests for fractures existing along an open hole section installed in a borehole, and experimental results are applied for testing a numerical model developed to the analysis and prediction of such hydromechanical interactions. Field experimental results show that conductive fractures form a dynamic and interdependent network, that individual fractures cannot be adequately modeled as independent systems, that new fluid intaking zones generate when pore pressure exceeds the minimum principal stress magnitude in that borehole, and that pore pressures much larger than this minimum stress can be further supported by the circulated fractures. In this study, these characteristics are investigated numerically how to influence the morphology of the natural fracture network in a rock mass by using a discrete fracture ntework model.
Evaluation of Design Factor For Debris Flow Dam Design
Kim, Woon-Hyung ; Song, Byung-Woong ; Lee, Kug-Hyung ; Kim, Burm-Sug ;
Journal of the Korean Geoenvironmental Society , volume 10, issue 2, 2009, Pages 69~76
In this study, design method for debris flow and drift wood dams used in Japan was evaluated to develop currently available design method practiced in Korea. In Japan, represented a similarity in the aspects of topography and the climate compared with Korea, casualties due to debris flow, landslide, and collapse of cliff as well as earthquake, have been reported every year. Especially, debris flow had often occurred during heavy rainy season rather than due to Typhoons or localized torrential thunderstorms. Since the characteristic of the debris flow reveals in the middle of water flow and soil behaviors, the behavior of debris flow associated with drift wood was not fully understood at this moment and therefore empirical design method to design debris flow dam is adopted in the practice and currently used in Japan. Based on the result of this study, modification of debris flow design method used in Korea are presented.