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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 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
Heavy Metal Concentrations in Soils and Crops in the Poongwon Mine Area
Kim, Ja-Kwan ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 2, 2010, Pages 5~11
Abandoned mines release acid mine drainage and cause the contamination of soil and crops around the mine area. The objective of current study is to evaluate effect of mine on the soil and crop contamination. Soils, water, and crops were collected and analyzed, and the heavy metal data were classified into types of the soil, types of crops, and distance from the minehead. Surface soils of the mine area were highly contaminated with heavy metals, especially with zinc and lead. Tailings and cultivated paddy soils were also highly contaminated. Heavy metal concentrations upon distance from minehead decrease steadily as the distance from the minehead increase. The correlation between heavy metals was extracted from soils and the content in the rice samples showed a positive relation for arsenic and cadmium but not a meaningful relation for other metals.
Relationship between Rainfall Intensity and Shear Strength of Slope
Lee, Jung-Sik ; Han, Heui-Soo ; Jang, Jin-Uk ; Yang, Nam-Yong ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 2, 2010, Pages 13~21
The unsaturated slope usually is stable for a long time, but fails during heavy rainfall. And the factors of the rainfall intensity exhibit significant roles because the water content and the shear stress developed along the potential failure surface will be changed by the rainfall intensity. The objective of the study presented in this paper is to analyze the relationship between rainfall intensity and shear stress of the soil slopes by applying the laboratory slope model apparatus and undrained direct shear test with rainfall intensity controlled. The soil sample was taken from the field slope of Youngdong, and particle size analysis was done. To look over the relationship between rainfall intensity and shear strength of slope, the three-dimensional relationships among shear strength, normal stress and water content of the slope soil samples are examined; those are based on the data from the TDR sensor and undrained direct shear test.
An Experimental Study on Behavior of Composite Pile
Lee, Seung-Ho ; Kim, Dong-Min ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 2, 2010, Pages 23~32
Demand on pile foundation is rapidly increasing, as an investment for the social overhead capital getting enlarged in Korea. Steel piles are in general use in construction due to their workability and superior durability. But the recent global rise in steel price led the engineers to seeking for an economical alternative that still has equivalent characteristics as compared with the steel pile. In this regard a composite pile, in which steel suitable to resist the tensile stress are used in the upper part of the pile, while less expensive PHC pile is adopted in the lower part of the pile where axial stress should prevail, was studied and both pile loading test and load transfer test were performed for the piles which have been constructed for the foundation of a bridge in Korea. These test results and some theories already issued were compared, and it was shown that p-y nonlinear analysis gave rise to similar results.
Estimation of Ultimate Methane Yields and Biodegradability from Urban Stream Sediments Using BMP Test
Song, Jae-Hong ; Kim, Seog-Ku ; Lee, Jun-Ki ; Koh, Tae-Hoon ; Lee, Tae-Yoon ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 2, 2010, Pages 33~42
The main objective of this study was to offer informations about the current conditions of stream sediments and to evaluate biochemical methane potentials of stream sediments from the urban streams in Busan city using conventional BMP tests. First we select total 5 urban streams and collect sediment samples. Then, COD, proximate analysis, volatile solid, organic carbon content and elemental analysis were conducted to determine characteristics of the sediments. Results show that COD, volatile solid and organic carbon content are determined in the range of 15.20~75.07 mg
, 2.34~11.54% and 1.28~34.21%, respectively. Also, several biochemical methane potential tests were performed in a laboratory. As a result, pH values of the reactors generally increased and then stabilized at 7.11~7.35. In addition, C/N ratio, ultimate methane and carbon dioxide yield (mL/g VS) and biodegradability (%) were determined to 1.05~10.27, 10.1~179.4, 10.3~34.4 and 4.0~30.1, respectively. For the determination of the correlations between ultimate methane yield and ultimate carbon dioxide yield, C/N ratio, COD, volatile solid and organic carbon content, a linear model was fitted to the data using a least-squares algorithm. As a result, except for COD (
=0.7586) and volatile solid (
=0.7876), Linear model was well fitted to each data with good values of the correlation coefficient (
=0.9795~0.9858). Finally, we propose empirical equations, which contain C/N ratio or TOC, for the prediction of ultimate methane yield for the urban streams in Busan city.
Improvement Plan of Excavation Performance Based on Shield TBM Performance Prediction Models and Field Data
Jung, Hyuk-Sang ; Kang, Hyoung-Nam ; Choi, Jung-Myung ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 2, 2010, Pages 43~52
Shield method is the tunnel boring method that propels a steel cylinder in the ground and excavates tunnels at once. After Marc Isambard Brunel started using the method for the Thames Riverbed Tunnel excavation in London, many kinds of TBM (Tunnel Boring Machine) developed and applied for the construction of road, railway, electricity channel, pipeline, etc. In comparison with NATM concept that allows to observe ground condition and copes with difficulty. The machine selected before starting construction is not able to be changed during construction in shield TBM. Therefore the machine should be designed based on the ground survey result and experiment, so that the tunnel might be excavated effectively by controlling penetration speed, excavation depth and cutter head speed according to the ground condition change. This research was conducted to estimate penetration depth, excavate speed, wear of disc cutter on Boondang Railway of the Han Riverbed Tunnel ground condition by TBM performance prediction models such as NTNU,
, Total Hardness, KICT-SNU and compare the estimated value with the field data. The estimation method is also used to analyze the reason of poor excavation efficiency at south bound tunnel.
A Study on the Application of Soil-Reinforced Retaining Wall for Excavation Slope
Byun, Yoseph ; Wrryu, Woong-Ryeal ; Lee, Dong-Ho ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 2, 2010, Pages 53~60
Considering environmental issues and lack of space, it is a necessity to minimize the amount of excavation. Various types of excavation methods are being used in practice. This study proposes a reasonable method for estimating the earth pressure acting on a reinforced wall in front of a excavated slope. The measured data in the field and numerical analyses were used. Results of the study shows that the earth pressure acting on the excavated wall is less than that estimated by Rankine's equations. It was shown that when the excavated slope is used with the reinforced wall, the pressures acting on the reinforced wall can be greatly reduced.
Field Measurement and Numerical Approach for Lateral Deformation of Retaining Wall
Do, Jong-Nam ; Wrryu, Woong-Ryeal ; An, Yi-Hwan ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 11, issue 2, 2010, Pages 61~68
Recently, it is a trend of the underground excavation to become larger and deeper for more effective use of available space and with the advent of new excavation technologies. The ground typically has a complex stratigraphy. The excavation can lead to large deformation in the nearby structures and large earth pressure on the wall. This can lead to serious problem in the stability of the wall. For the retaining wall to be safely constructed, it is important that the stratigraphy and engineering properties of the ground be accurately estimated, based on the excavation plan and appropriate excavation method. This study uses the measured field data and numerical results to characterize the characteristics of the lateral deformation of the retaining wall. A touredof six field data were analysed. SUNEX, a numerical program which uses the elasto-plastic model to represent the soil, was used. It was shown that the measured deformations exceeded the proposed values for shallow excavations. Overall, the maximum lateral deformation was within the proposed value and hence, the walls were analyzed as safe.