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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 Vibration Propagation Characteristics of Controlled Blasting Methods and Explosives in Tunnelling
Jung, Hyuk-Sang ; Jung, Kyoung-Sik ; Mun, Hong-Nyeon ; Chun, Byung-Sik ; Park, Du-Hee ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 2, 2011, Pages 5~14
The most common problem encountered in domestic tunnel construction sites are solving public resentments caused by damage to adjacent structures and buildings. The most effective excavation method in rock tunnelling is the drilling and blasting, which is the main cause of vibration resulting in the public resentments. In this study, numerical analysis is conducted to compare the vibration reduction effect of line drilling and pre-splitting methods. Furthermore, the numerical simulations are verified and the results are quantified. Finally, various combinations of explosives used in controlled blasting are used and the vibration reduction effects are evaluated, thereby proving the applicability of the controlled blasting for reduction of vibration in tunnelling.
Developing for Reduction Technology of AMD through Coating on the Surface of Pyrite Using Minerals
Yun, Hyun-Shik ; Gee, Eun-Do ; Ji, Min-Kyu ; Lee, Woo-Ram ; Yang, Jung-Seok ; Park, Young-Tae ; Kwon, Hyun-Ho ; Ji, Won-Hyun ; Kim, Ki-Joon ; Jeon, Byong-Hun ; Choi, Jae-Young ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 2, 2011, Pages 15~22
In this study, the effect of surface coating on iron-sulfide mineral for preventing the product acid mine drainage(AMD) was progressed by oxidation process of sulfide minerals abandoned mine Area. Three abandoned mines, Yongdong coal mine, Sil Lim mine, and Il Koang mine were selected as a sulfide mineral resource due to higher contamination rate. Six coating agents, apatite, limestone, mangnite, dolomite, bentonite, and cement were used for preventing the AMD with
and NaClO as a oxidizing agent helping for oxidizing process on sulfide minerals. Experimental results showed that sulfide mineral surface was coated effectively. Cement has a higher ability of preventing AMD when the ratio of cement to mineralis 1:1 and experimental condition is maintaining 4Days.
Unsaturated Soil-Water Characteristics Curve with Silt Contents for Nak-Dong River Sand
Moon, Hong-Duk ; Kim, Dae-Man ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 2, 2011, Pages 23~33
In this paper, we got soil-water characteristic curve(SWCC) of Nak-Dong River's sand respectively as relative density 40%, 60%, 80% and content of silt 0%, 10%, 20%, 30%. As a result, the more the sand densify in the same silt content and the more the sand has silt in the same relative density, the change of volume water content was decreased. we have known effect of silt contents for SWCC and verified existing empirical formula of SWCC. As experiment results of soil-water characteristic curves compared to the empirical solutions, the results of van Genuchten(1980) and Fredlund & Xing(1994) were well-matched showing S type curves with experiment results. Especially the empirical solution of Fredlund & Xing showed almost same results of the coefficient of correlation(
) equal to 0.99.
Characteristics of Groundwater Levels Fluctuation and Quality in Ddan-sum Area
Kim, Gyoo-Bum ; Choi, Doo-Houng ; Shin, Seon-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 2, 2011, Pages 35~43
Confined aquifer, which is separated with upper clayey or silty materials, is partially distributed at the depths of the sediments in Ddan-sum area on the lower Nakdong river. Measurements of groundwater levels at 13 sites explain that groundwater flow shows seasonally various due to seasonal rainfall and agricultural water use. From 9 long-term monitoring data of groundwater levels at 7 sites, 3 types of groundwater levels time series can be classified using principal component analysis. The first type is seen in the center of Ddan-sum and has a round-shape graph due to a weak response to stream water levels. The second type exists in the outer part of Ddan-sum and shows sharply peak-shape graph due to a rapid and strong response to stream water levels and rainfall. The last type, which is seen in a deep layer, has a periodicity by tital effect. From geochemical analysis at each monitoring sites, [
] type happens in the center of Ddan-sum far from Nakdong river, and [
] and [
] types exist in the outer of Ddan-sum affected by river quality.
An Analytical Study on the Relationship between Factor of Safety and Horizontal Displacement of Soil Nailed Walls
Kim, Hong-Taek ; Lee, In ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 2, 2011, Pages 45~53
Soil nailing method was often designed by the slope stability analysis based on limit equilibrium. However, in the case of shorten length of nails, although the calculated factor of safety is within the design factor of safety, the horizontal displacement of soil nailed walls occurred above the allowable limit. In this study, relationship between the load and factor of safety, and relationship between the load and displacement ratio based on the test results were analysed. From the analysed results, the relationship between factor of safety and displacement ratio was estimated. For the mobilized horizontal displacement of the walls within the serviceability limit corresponding to the displacement of less than 0.3% displacement ratio, the calculated factor of safety by limit equilibrium analysis had to satisfy above 1.35. Also, although the minimum factor of safety is estimated above 1.35, the maximum horizontal displacement is often mobilized above 0.3% of excavation height. Therefore, it is necessary to perform the numerical analysis of soil nailed walls in the case of low shear strength or high excavation.
Evaluation and Comparative Physical/Biological Removal Performance for Extremely Low-Concentration NDMA(N-nitrosodimethylamine)
Park, Se-Yong ; Kim, Hui-Joo ; Kim, Moon-Il ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 2, 2011, Pages 55~61
NDMA(N-Nitrosodimethylamine) has been considered as a carcinogenic pollutant even at extremely low-concentration (10ng/L). However, previous researches on NDMA have focused on mainly high concentration due to a difficulty of analysis. In this study, removal efficiencies were evaluated for individual or combined methods with PAC(Powder Activated Carbon), GS(Granular Sludge), MF(Microfiltration), UF(Ultrafiltration) and Silica gel(MCM-41, Diatomite, Spherical silica gel) at both aerobic and anaerobic conditions. Combined method of GS, PAC and UF membrane at anaerobic condition showed the highest removal efficiency of 65% while Silica gel showed the lowest removal efficiency of 6%. The outcomes of this study could be used further study of extremely low-concentration NDMA removal.
Decomposition Characteristics of 1,4-dioxane in an E-beam Process and Toxicity Assessment
Hwang, Hae-Young ; Chang, Soon-Woong ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 2, 2011, Pages 63~68
The aim of this study was 1,4-dioxane's degradation efficiency and toxicity test applying E-beam. The experiments were shows that the degradation efficiency in the initial concentration of 1,4-dioxane and the irradiation capacity of E-beam and the degree of mineralization based on a change of scavenger gas. The biological toxicity test by using on of green algae, Pseudokirchneriella Subcapitata was conducted to lead the reducing toxicity. Degradation efficiency of 1,4-dioxane was improved when E-beam irradiation intensity was higher and the efficiency of TOC removal using Radical scavenger gas was increased by
in order. In 4 days(96hrs), toxicity test results indicated that toxicity effect was decreased by increase of E-beam irradiation intensity.