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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
Strength Development Mechanism of Inorganic Injection Material
Han, Yun-Su ; Lee, Jong-Hwi ; Kang, Hyoung-Nam ; Baeg, Seung-In ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 5~12
Recently, NDS(Natural and Durable Stabilizer)method and other similar methods are composed of inorganic accelerating agent and the ultra-super fine cement have been studied as the ground improvement material in Korea. However, in the existing research, the chemical changing process of NDS in the strength development mechanism with the elapsed curing time and the principles of strength development did not give an explanation. For the popularization of the inorganic grout material, it determined that the mechanism verifying of the curing process had to be clearly preceded. Therefore, unconfined compression test, SEM and XRD analysis were performed by the elapsed curing time and were analyzed. In addition, the same trial for SGR method, that is the representative example of the water glass grout material, was selected as comparative target in order to distinguish properties of NDS more clearly. The result of experiment, the strength development mechanism of NDS could be investigated through the close correlation of the unconfined compression strength-SEM-XRD analysis, and excellence of a performance was confirmed.
Analysis on Relation of S-wave Velocity and N Value for Stratums in Chungcheong Buk-do
Do, Jong-Nam ; Hwang, Pil-Jae ; Chung, Sung-Rae ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 13~22
In this study, features of correlation between S-velocity and N value are derived from 9 suspension PS layers in Chungcheong Buk-do. S-velocity to be measured on Chungcheong Buk-do is classified into 5 as conditions of stratum that are ; cohesive soil layer, sandy soil layer, gravel layer, weathering soil layer, weathered rock layer. Each correlation formulas between N value by SPT and S-velocity is proposed from these classifications. And correlation formula for whole soil body except weathered rock layer also is proposed for reference. Corelation formulas developed this study formed square expression considering existing formulas produced internationally. Strength parameter converted to linear if N value is more than 50. Features of proposed formula which came up with comparative analysis of international result of cohesive soil layer and sandy soil layer and gravel layer show similar to existing ones. But there is deference that result of correlation formula for weathered rock layer is a little smaller than domestic formula's one. Because correlations of weathered rock layer above the N value of 50 is converted into a linear formation.
Adsorption Characteristics of Surfactants on Soil
Lee, Chae-Young ; Park, Seung-Yong ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 23~28
This study was conducted to investigate the adsorption characteristics of various surfactants including biosurfactant, SWA 1503, Triton X-100 and sodium dodecyl sulfate(SDS) on soil. The Freundlich adsorption isotherm equation was found to be the best to describe experimental results. The amount of adsorbed surfactant on soil increased as the content of clay increased. The results showed that surfactant was adsorbed mainly on the surface and the pores of soil since the surface area of clay was larger than that of sand. The amount of adsorbed surfactants on soil was as follows: Biosurfactant > SWA 1503 > Triton X-100 > SDS.
Slope Stability Analysis by Rainfall Infiltration
Han, Heui-Soo ; Cho, Jae-Ho ; Yang, Nam-Yong ; Shin, Baek-Chul ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 29~38
The unsaturated layers by rainfall infiltration are not properly reflected in construction codes to do slope design. The objective of this paper is to analyze the slope behavior according to the saturation layer increase resulted from the rainfall infiltration, to do that the laboratory slope model apparatus was adopted. From the model apparatus, the variation of water content and strength parameters of the model slope were analyzed. The safety factors of model slope was decreased, if saturation layer was increased from 3.0m to 4.5m, which means ground water level 3m selected from construction codes makes higher safety level. Also, if the ground water level is located in soil surface, the lower safety level will show up. Therefore, to make the proper slope design, the experiments and analysis of variation of saturation layer is needed.
An Analysis of the Effect of PBD Discharge Capacity to Leave Period
Lee, Kee-Yong ; Park, Min-Chul ; Jeong, Sang-Guk ; Lee, Song ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 39~49
Recently PBD method, one of acceleration of consolidation methods is used in the soft ground to shorten consolidation time for fast settlement during construction. It is economical and easy to work. Discharge capacity of PBD is sensitive in proportion to thickness of soft ground layer, and drainage of PBD declines due to disturbance effect in surrounding ground by mandrel used for vertical drainage setting and setting machines and type. Also, deviation of discharge capacity is large according to ground condition, construction condition and soil properties. In addition, when embankment loading is not conducted instantly after PBD setting due to rain or lack of embankment material supply, it causes leaving period problems. But cause and analysis of those problems for discharge capacity is lack. So, in this test, ground improvement and discharge capacity is investigated by implementing composite discharge capacity test for analysis of an effect factor of PBD discharge capacity with leaving period. After fixing the vertical drain on a cylindrical cylinder, put churned sample into the cylinder. Then leave 0day, 30day, 60day and 90day. And then, load following the loading step of 30, 70 and 120kPa using a pressure device. As a result, the longer leaving period, discharge capacity is reduced. It is caused by a decrease of discharge area caused by creep transformation moisture absorption of PBD filter after long leaving period.
Application of Pulsed Electric Field Treatment for Scaling Prevention
Choi, Seung-Pil ; Kim, Jong-Oh ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 51~56
This study was conducted to investigate the applicability of pulsed electric field (PEF) treatment for the prevention of scaling formation and membrane fouling reduction. To validate the effect of PEF and to identify the mechanism, some experiments with and without PEF treatment were carried out. PEF treatment affected the precipitation of
particles were actively grown and sedimented. It was confirmed that the calcium ions were decreased as 78% and particle size was grown by PEF treatment. It was also verified that the crystalline structure of
was transformed by PEF treatment from Aragonite, which is formed at a high temperature and hard to be removed, to Calcite being stable at room temperature. In PEF treatment, permeate volume and permeation flux were greater than that of without PEF, case while Langelier Index(LI) decreased. From the experiment results, PEF treatment is believed to be an effective method to prevent scaling formation and to mitigate
fouling as the pretreatment of membrane filtration.
Statistical Analysis of The Influence of Inorganic Anions on MTBE Decomposition by Photolysis(UV/
Chun, Suk-Young ; Chang, Soon-Woong ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 57~62
This study investigated the effects of various inorganic anions(
) on the Methyl tert Butyl Ether(MTBE) degradation by photocatalysis using statistical method. Generally, this process in general demands the generation of hydroxyl radicals(OH radical) in solution in the presence of UV light. The generation of radicals were affected by inorganic anions in solution that inhibited the photodegradation by their trapping hydroxyl radicals. The effects of inorganic anions were mathematically described as the independent variables such as
, and these were designed by mixture analysis that was one of the response surface methodology(RSM). Regression analysis on ANOVA showed significant p-value(p<0.0001) and high coefficients for determination value(
=98.91%). Contour and response surface plots showed that the effects of inorganic anions for MTBE photodegradation based on UV/
process. In the result,
inhibited the photodegradation of the MTBE by their trapping hydroxyl radicals, and the interaction by these two factors was observed.
A Numerical Analysis Study for Estimation of Ultimate Bearing Capacity and An Analysis of the High Capacity Bi-directional Pile Load Tests of the Large-diameter Drilled Shafts
Nam, Moon-Suk ; Kim, Sang-Il ; Hong, Seok-Woo ; Hwang, Seong-Chun ; Choi, Yong-Kyu ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 63~72
The high capacity bi-directional pile load test is an optimum pile load test method for high-rised buildings. Especially, a high pressure and double-acting bi-directional pile load testing, a special type of the high capacity bi-directional pile load test, is the most practical way to overcome limitations of loading capacities and constraints of field conditions, which was judged to be a very useful test method for requiring high loading capacities. Total of 2 high capacity bi-directional pile load tests(P-1 and P-2) were conducted in high-rised building sites in Korea. Based on the field load test results, the sufficiency ratio of loading capacities to design loads for P-1 and P-2 were 3.3 and 2.1, respectively. For P-2, the load test could not verify the design load if 1-directional loads applied slightly smaller than the actual applied load. Also, high capacity bi-directional pile load tests were difficult to determine an ultimate state of ground or piles, although the loads were applied until their maximum loads. Hence, finite element analyses were conducted to determine their ultimate states by calibrating and extrapolate with test results.
Flow and Strength Characteristics of the Lightweight Foamed CLSM(Controlled Low-Strength Materials) with Coal Ash
Lee, Seung-Jun ; Lee, Jong-Hwi ; Chae, Hwi-Young ; Chun, Byung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 73~82
Coal ash of industial by-products was not recycled about 30% in total emissions. Moreover, it caused environmental pollution as well as wasted unnecessary expenses and time. Currently, fly ash(FA) is recycled as construction material however ponded ash(PA) is mostly buried. Lightweight foamed Controlled Low-Strength Materials(CLSM) evaluated in this study reduces unit weight by mixing foam in the traditional Controlled Low-Strength Material and has lightweight and flowability to be available for backfill materials in construction. Flow test, unconfined compressive strength test, and foamed-slurry unit weight test were performed in this study and the applicability of lightweight foamed CLSM for construction materials was evaluated. The results indicate that the mixture ratio(PA:FA) ranging from 70:30 to 50:50, cement of 7%, foam of 2~3%, and water content of 26.5~29.5% were required to satisfy the following standards such as flow value(i.e., 20cm), unconfined compressive strength(i.e., 0.8~1.2MPa), and foamed-slurry unit weight(i.e., 12~15kN/
Centrifugal Model Test on Behavior of Underground Corrugated Steel Plate with Compaction Degree
Heo, Yol ; Kwon, Seon-Uk ; Kim, Hong-Jong ; Bae, Woo-Seok ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 10, 2011, Pages 83~90
A series of centrifugal model test was conducted to investigate the distribution of vertical earth pressure on circular ductile underground corrugated steel plate waterway culvert with considering the compaction degree of the backfill in the high landfilled embankment section. The compaction degree of backfill was varied to 80, 85, 90, and 95% at the 53g-level gravity considering the similarity of the site. As a result of this test, the load reduction factor by the arching effect of the top of corrugated steel plate showing ductile behavior nearly agreed with the load reduction factor according to the compaction degree of backfill specified in the AISI(2002) design method. The vertical earth pressure measured at the top of the corrugated steel plate was linearly decreased as the compaction degree increased. The greater the compaction degree of backfill was, the greater the reduction of surface loading on the top of the corrugated steel plate by arching effect. The load decreased by arching effect on top of the corrugated steel plate was transferred to the side backfill of the corrugated steel plate(EP 1) and the outside of backfill(EP 3).