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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
Strength and Permeability Characteristics of Soil-Bentonite Mixture
Jin, Guang-Ri ; Im, Eun-Sang ; Kim, Ki-Young ; Sin, Dong-Hoon ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 4, 2010, Pages 5~12
Soil mixture using bentonite as a cutoff material is used a lot for various structures such as landfills, banks and dams as cutoff materials. But seepage water is expected to seep since shear failure of filter layer occurs due to external load, embankment load when constructed. Generally, only coefficient of permeability of Soil Mixture is considered irrespective of the changes of intensity on amount of additives. This research is to study on how the changes of amount of bentonite affects permeability and strength of soil mixture. So successive experiments for measuring permeability and strength were conducted as the amount of bentonite changes from 0 to 4%, mixing with the bed material and then making specimens. Around construction site of B dam. As a result, 2.085E-07 cm/sec was shown when the amount of Soil Mixture was 4%. It is proved that unconfined compressive strength and tensile strength increase as the amount of bentonite increases, but saturation shear strength of bentonite soil mixture from the CD experiment is hardly influenced by the amount of bentonite.
Study on Precipitation of the Minerals in the Soil of Imha Reservoir Watershed
Kim, Yeon-Jeong ; You, Sam-Hwan ; Jeong, Hyung-Jin ; Baek, Seung-Cheol ; Lee, Sung-Min ; Seo, Eul-Won ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 4, 2010, Pages 13~18
The present study was undertaken to investigate the characteristic of suspended matter in soils of Imha-Dam area by turbidity. Soil sampling was conducted at 5 points of Yeongyang (Turbid area) and 2 points of Cheongsong (Clean area). Experimental analysis was conducted using those samples. The pH of water in the soils at turbid area was higher than that of clean area. X-ray diffraction analysis showed that every sample consists in mainly quartz, illite and feldspar before precipitation. After precipitation for 3 days, the content of quartz and feldspar was decreased and the content of illite was increased at turbid area. The soil of Sinheung (St. 6) at clean area was analyzed only illite. SEM-EDS analysis showed the much content of
as to every sample before precipitation, but
, CaO and
with illite was increased after precipitation for 3 days as to every sample. Experimental results exhibited that the major mineral of turbid water was illite at turbid area and clean area.
3-Dimensional Analysis of Slope Behavior with Varying Safety Factor
Han, Heui-Soo ; Baek, Yong ; Jo, Jae-Ho ; Hwang, Chan-Gu ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 4, 2010, Pages 19~24
Generally, slope behavior is analyzed by 2-dimensional creep model. Creep behavior shows the deformation variation as time goes by without stress increment. Convention 2-dimensional creep analysis does not have the term of stress variation, it means creep analysis could not figure out the relationship of shear strength variation according to the stress variation and displacement. The slope weight and shear strength is directly related and interlocked to the safety variation and displacement of slope, therefore, this phenomenon could be treated and analyzed as combining the hysteresis and creep, the iteration of this process will result in the slope safety. Furthermore, the combined analysis will be the slope analysis considering shear stress, displacement and shear strength with time variation. In real case, because the variation of shear stress and strength happen at the same time, they should be changed into safety factor which is function of them. This paper shows the 3-dimensional variation of unit weight of soil with hybrid analysis considering creep and hysteresis on the seepage and drainage of rainfall, futhermore variations of shear stress and strength which make the safety factor change.
Consolidation Behavior of Poor Mixed Soil-Cement
Lee, Jong-Min ; Kwon, Young-Cheul ; Lee, Heung-Gil ; Lee, Bong-Jik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 4, 2010, Pages 25~31
The amount of dredging clay will be greatly increased by the eco-rive project and port development in Korea. Geotechnical engineers have thrown their efforts into the new ways for effective re-uses of the dredging clay such as the material for reclamation, and so on. However, very high initial water content and low strength causes unexpected difficulties in the aspect of trafficablility or time for consolidation. Therefore, the injection of cement stabilizer is used as one of ways to improve reclaimed ground. However, it also makes an argument by heavy metal from cement stabilizer. In this paper constant rate of strain consolidation test and normal consolidation test were performed to investigate behavior characteristics of the consolidation about soil-cement include lean mixed cement to reduce the environmental loads by the cement. The experimental results of consolidation characteristics about soil-cement include lean mixed cement influenced by mixing ratio. Especially it was observed that mixing ratio of 4%~6% leads not only the reduction of consolidation settlement, but time for consolidation.
Engineering Characteristics of Plasticizer Lightweight Foamed Concrete according to Changes of Mixing Ratio
Seo, Doo-Won ; Kim, Hye-Yang ; Kim, Kyung-Min ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 4, 2010, Pages 33~42
The lightweight foamed concrete is used to reduce the weight of the backfill material. When it is applied, the volume is often contracted due to segregation, necessitating re-injection. In this study, it was manufactured a new lightweight foamed concrete by adding plasticizer and tested the engineering properties of the material. The tests included unconfined compressive strength test, unit weight test, flow test, pH test, and permeability test. The plasticizer is shown to have an important influence on the flow. It was shown that 2~2.4% of plasticizer was adequate. The new material was shown to have positive influence on the flow and reduction of weight when applied to the backfill of the structures.
Characterization of MTBE (Methyl Tertiary Butyl Ether) Utilizing Bacteria from the Gasoline Contaminated Soils
An, Sang-Woo ; Lee, Si-Jin ; Park, Jae-Woo ; Chang, Soon-Woong ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 4, 2010, Pages 43~50
In this study, we have isolated MTBE utilizing bacteria at the gasoline contaminated soil and also MTBE degradation patterns were characterized. The 18 bacterial mono-cultures isolated from enrichment cultures were screened for MTBE degradation. Of the 18 strains, the 3 strains (Flavobacterium, Pseudomonas, and Achromobacter) have shown effective MTBE degradation. Experimental parameters affecting the growth conditions (such as temperature, pH, initial cell mass) were optimized. Experimental parameters such as temperature
, pH 7, and initial cell mass 0.6 g/mL in optimal growth conditions for MTBE degradation. The optimal growth conditions of the isolated stains were temperature
, pH 7, and initial cell mass 0.6 g/mL in our experiment, respectively. The first order degradation coefficients of Achromobacter, Mixed culture, Pseudomonas, and Flavobacterium were 0.072, 0.066, 0.047, and
, respectively. and also, it could be expressed as a degradation rate considering cell mass (1.302, 1.019, 0.523, and 0.352 mg/TSS g/hr for each microorganism). Although Achromobacter has shown highest MTBE degradation rate, degradation rate for BTEX was relatively lower than other strains. and Mixed culture and Flavobacterium have shown similar degradation pattern for MTBE and BTEX biodegradation.
A Case Study on Shallow Foundation Design of the Reclaimed Land Based on Dynamic Compaction Method
Wrryu, Woong-Ryeal ; Byun, Yo-Seph ; Lee, Jong-Bum ; Kim, Kyung-Min ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 4, 2010, Pages 51~59
This article is a case study for the example of the foundation design, in the project area of the silty sand layer that is spread shallowly with loose status, to make the site for a structure and build it up. The site is located on the dredged and reclaimed land in Gun-San and In-Cheon that is formed the silty sand layer with loose status range around 10 meters underground level, the solid ground for the lower pile is shown around 20 meters underground level. Therefore, this area has to be done by ground improvement when applying for the shallow method of foundation. Dynamic compaction method considering the conditions of the design loads in each zone has to be decided through comparative review on the method of foundations and pilot field test was conducted, and drilling investigation and plate bearing test were achieved as well. The analysis results of the tests prove that stability against bearing capacity was acquired by ground improvement effect.