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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 Study on The Scale Effect of Landslide Model Tests
Jeong, Ji-Su ; Ji, Young-Hwan ; Kim, Yoo-Tae ; Lee, Seung-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 8, 2011, Pages 5~12
This study was performed to analyze the degree of rainfalls, the duration time of rainfalls, the inclination of slopes and other damage causes depending on the ground condition, when the landslide occurs by the rainfall. Based on that, a big and a small model soil box were compared to examine the features of landslides, which is ultimately for forecasting landslides. An artificial rainfall device was installed in the model box, and the large model box has a real-size slope in it. Also, various measures were fulfilled such as collapse forms, a pore pressure, an earth pressure and moisture contents in order to analyze the effect of the model box size on the landslide mechanism and to test the usability of a small model box as a material for landslide experiments.
Undrained Shear Behavior of Sandy Soil Mixtures
Kim, Uk-Gie ; Ahn, Tae-Bong ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 8, 2011, Pages 13~24
In the part of geotechnical engineering, soils are classified as either the coarse grained soil or the fine-grained soil following the fine content(
=50%) according to the granularity, and appropriate design codes are used respectively to represent their mechanical behaviour. However, sand-clay mixtures, which are typically referred to as intermediate soils, cannot be easily categorized as either sand or clay. In this study, several monotonic undrained shear tests were carried out on Silica sand fine mixtures with various proportions, and a wide range of soil structures, ranging from one with sand dominating the soil structure to one with fines controlling the behaviour, were prepared using compaction method or pre-consoldation methods in prescribed energy. The shear strength of mixtures below the threshold fines content is observed that as the fines content increases, maximum deviator stress ratio decrease for dense samples while an increase is noted for loose samples. Then, by using the concept of fines content and granular void ratio, the monotonic shear strength of the mixtures was estimated. It was found that the shear behavior of mixtures is greatly dependent on the skeleton structure of sand particles.
A Study on the Collapse Reason by Slope Stability Analysis Considering Construction Stages
Byun, Yoseph ; Jang, Hyeon-Kil ; Jung, Kyoung-Sik ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 8, 2011, Pages 25~31
In recent rainy seasons, severe rain storms have caused frequent reinforced retaining wall collapses and slope sliding which have lead to casualties. In this paper, investigating cases of reinforced retaining wall failure, the causes of cracks in reinforced retaining wall and slope sliding have been examined, and a finite element analysis considering the construction phase has been done to analyze the cause and characteristics of slope sliding. As a result, reinforced retaining wall displacement has increased due to heavy rain storms and the increase size has been shown to be large. From these results, it has been analyzed that pile driving can have an effect on the collapse of reinforced retaining walls.
A Study on the Behavior of Sand Compaction Piles in Soft Ground
Lee, Jung-Sang ; Chung, Sung-Rae ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 8, 2011, Pages 33~38
Presently, domestic SCP method with low replacement ratio is required as alternative in order to overcome the profitability of the sand resource because of the deficiency phenomenon of the sand resource by the actual condition design and construction is made by SCP method with low replacement ratio more than 70% for the port construction in the safe side. Sand compaction pile(SCP) method has been mainly used to improve the properties of soft clay or loose sandy ground. In design of SCP at soft clay ground, it is very important to determine the stress concentration ratio of composite ground relevant to the area replacement ratio. In this study, 2-dimensional FEM analyses were carried out to evaluate the stress concentration ratio of composite ground depending upon the area replacement ratio. When the interpretation result replacement ratio was 30%, the stress assigned rate showed and as the replacement ratio was high, the stress assigned rate according to the sinkage showed the low stress assigned rate.
A Study on the Development of Flowable Fill Materials for H-pile
Jeong, Won-Jeong ; Im, Jong-Chul ; Kim, Tae-Hyo ; Joo, In-Gon ; Kang, Hyun-Woo ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 8, 2011, Pages 39~50
Nowadays, H-piles are usually used as temporary retaining walls, and sometimes buried in the ground after construction. The purpose of this study is the development of flowable fill materials that are easy to fill holes of retaining wall structure and minimize friction during pulling out H-pile. The first test was performed to decide mix proportion that is reasonable for purpose, in the second test, direct shear test was performed to get pullout resistance between flowable fills material and H-pile, and one dimensional consolidation test was performed to analyze the compressibility. In the test result, it showed that flowable fill material mix proportion is 350-450% of water, 70-100% of cement and 70-100% of sand based on the bentonite weight.
Effect of Underground Dam for the Prevention of Seawater Intrusion at the Seom-jin River
Kim, Sung-Yun ; Kim, Gyoo-Bum ; Park, Joon-Hyeong ; Shin, Seon-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 8, 2011, Pages 51~57
Surface water at the lower part of the Seom-jin river has a high salinity because the erosion at river bottom has made sea water move upstream continuously since 1978. The effect of underground dam on the prevention of sea water intrusion was modelled in this study. Present chloride concentration in surface water decreases exponentially along a river and in groundwater is about one-tenth of surface water's. The finite element method model, FEFLOW, was conducted on the assumption that the underground dam with a height of 25m over a bedrock is located under a water surface at the site of 4.6km from an estuary. The result shows that the position with chloride concentration of 0.25psu moves downstream from the sites of 25km to 22km, if an enough sedimentation with 5m thickness happens in the upper reservoir of underground dam. On the other side, the underground dam is little effective for the prevention of sea water intrusion in case of non-sedimentation.
Verification of Applicability of Hybrid CFFT Pile for Numerical Analysis
Kim, Hong-Taek ; Lee, Myung-Jae ; Park, Jee-Woong ; Yoon, Soon-Jong ; Han, Yeon-Jin ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 8, 2011, Pages 59~67
The interaction of the ground deformation and composite piles, which is made of fiber glass, was analyzed for the effective pile application under vertical loads. This study was performed to conduct experimentation test and propose the material characteristics of the new type concrete injection circular FRP pile for the improvement of the defect of CFFT-Concrete composition piles and FRP-Concrete composition piles(FRP reinforced column direction). Additionally, in order to analyze the behaviour characteristics of composite pile and steel pile the numerical analyses were carried out.