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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 9, Issue 7 - Dec 2008
Volume 9, Issue 6 - Oct 2008
Volume 9, Issue 5 - Aug 2008
Volume 9, Issue 4 - Jun 2008
Volume 9, Issue 3 - Apr 2008
Volume 9, Issue 2 - Feb 2008
Volume 9, Issue 1 - Jan 2008
Selecting the target year
Residual Settlement for Dredged Soil Deposit Considering Stress History in Incheon Area
Chun, Byung-Sik ; Lee, In-Hoon ; Park, Duk-Hyum ; Sung, Hwa-Don ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 5~13
To identify the reclamation history formed by top dredged soil reclamation layer over the original ground, various field tests and laboratory tests were conducted. Especially when the original ground was not completely consolidated, CPTu test was carried out to calculate rational settlement due to the banking load. CPTu test results showed that the degree of consolidation of weak clay ground by dredged reclamation was on average 80%. As the research area was not completely consolidated by dredged reclamation in the past, the consolidation settlement should account for the residual settlement (20%) in the case of additional banking load. When the degree of consolidation of the original ground was not taken into account, the residual consolidation was expected in excessive settlement (up to 20%) and in such case PBD (Plastic Board Drain) was not effective in obtaining desired degree of consolidation.
Engineering Characteristics of Loess Mixed with Oyster Shell
Chang, Yong-Chai ; Hong, Kwan-Pyo ; Lee, Seung-Eun ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 15~22
Recently loess are used as design and construction materials in some construction sites. However, many problems have come to the fore because the loess was considered merely as ordinary soil, not taking the engineering characteristics of loess into account at all. The purpose of this study is to effectively mix and use the oyster shell-which is the byproduct of oyster farming in the clean and pure water zone of Southwestern region-with loess in a bid to increase the utility, considering that loess itself has the limit for civil engineering purpose, and research the usability of oyster shell as an alternative material for construction.
Efficient Anaerobic Digestion for Highly Concentrated Particulate Organic Wastewater
Lee, Sung-Bum ; Shin, Kyu-Chul ; Kim, Hui-Joo ; Kim, Hyun-Ju ; Choi, Chang-Kyoo ; Kim, Moon-Il ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 23~29
It has been mentioned that CSTR (Completely Stirred Tank Reactor) and UASB (Upflow Anaerobic Sludge Blanket) processes, the existing anaerobic processes, have problems in the treatment of highly concentrated particulate organic wastewater (HCPOW). Therefore, this paper discusses the treatment possibility of distillery wastewater which is a typical HCPOW using ADEPT (anaerobic Digestion Elutriated Phased Treatment) process. In the comparison of CSTR and ADEPT, ADEPT produced much higher gas than that of CSTR removing more organic matters and suspended solids in ADEPT process, ADEPT had no effect on the decrease in pH by volatile fatty acids and showed steady pH in spite of relatively short HRT. In the results of removal rate according to recycle ratios between 6Qin and 2Qin in ADEPT, 6Qin showed high removal rate during the operation time. Therefore it appears that ADEPT had an applicability for the treatment of distillery wastewater. ADEPT could be a economical process, due to the short HRT, the energy recovery by the methane production, and the utilization for carbon source of produced organic acid from the ADEPT-acid reactor.
Evaluation on Efficiency of VOC Removal in Groundwater Using Diffused Aeration System
Seo, Min-Woo ; Suk, Hee-Jun ; Choi, Doo-Hyoung ; Kim, Jin-Hoon ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 31~37
Diffused Aeration System (DAS) is one of the remediation methods used for removing contaminants in groundwater and this method brings air bubbles in contact with contaminated water, afterwards transferring contaminants in liquid phase into air phase. In this study, three applicability tests using DAS were conducted in two highly contaminated sites. For these tests, diffused air bubbles are generated with a in-flow rate of 17.1, 44.8 and 76.5 (1/min), respectively. The concentrations of TCE in grounwater and air phase were measured during the tests. The measured results showed that TCE concentration hit the highest value after 6~8 min and afterwards decreased gradually. Also, it was observed that the TCE concentration in air phase changed depending on the rate of diffused aeration. In addition, KLa values from liquid to air phase were calculated based on the test results and those of three tests (test 1, 2 3) were 0.444, 1.158 and 1.836(1/hr), respectively. From the comparison of
values, the faster air in-flow rate is, the higher the efficiency of the DAS is.
Analysis of Influence Factors for Remediation of Contaminated Soils Using Prefabricated Vertical Drains
Park, Jeong-Jun ; Shin, Eun-Chul ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 39~46
Due to the growth in industrialization, potential hazards in subsurface environments are becoming increasingly significant. The extraction of the contaminant from the soil and movement of the water are restricted due to the low permeability and adsorption characteristics of the reclaimed soils. There are a number of approaches to in-situ remediation that are used in contaminated sites for removing contaminants. These include soil flushing, dual phase extraction, and soil vapor extraction. Among these techniques, soil flushing was the focus of the investigation in this paper. Incorporated technique with PVDs has been used for dewatering from fine-grained soils for the purpose of ground improvement by means of prefabricated vertical drain systems. The laboratory model tests were performed by using the flushing tracer solutions for silty soils and recorded the tracer concentration changes with the elapsed time and flow rates. The modeling was intended to predict the effectiveness and time dependence of the remediation process. Modeling has been performed on the extraction, considering tracer concentration and laboratory model test characteristics. The computer model used herein are SEEP/W and CTRAN/W, this 2-D finite element program allows for modeling to determine hydraulic head and pore water pressure distribution, efficiency of remediation for the subsurface environment. It is concluded that the coefficient of permeability of contaminated soil is related with vertical velocity and extracted flow rate. The vertical velocity and extracted flow rate have an effect on dispersivity and finally are played an important role in-situ soil remediation.
An Analysis of Horizontal Behaviour of H-Pile under Mechanically Stabilized Earth Wall Abutment
Kim, Nag-Young ; Jeon, Kyung-Soo ; Lee, Yong-Jun ; Jun, Jin-Taek ; Shim, Jae-Won ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 47~59
Application of mechanically stabilized earth wall (MSEW) abutment has been rapidly increasing in United States of America, Pennsylvania since 2002. MSEW is effective for reducing construction cost and period compared to general concrete reinforced wall. In the paper, theoretical background and conventional criterion of MSEW abutment that is widely used abroad are analyzed. Based on the results, application of suitable MSEW abutment to domestic bridge type is examined. For the application of MSEW abutment in Korea, load interacting with upper shoe in domestic bridge types and structural analyses of beam seat and pile are investigated. As a result, all applications are possible except for PSC BOX Bridge that has heavy self-weight of girder. Through two and three dimensional numerical analyses, horizontal behaviour mechanisms between pile and MSEW were analyzed and field tests are also carried out for seven piles behind earth walls. From results of field tests, it is confirmed that an angle of internal friction of backfill material needs to be greater than 34 degree to use H-Pile as foundation of MSEW.
Deformation Characteristics of the Pressurized Grouting Soil Nailing Systems from the Field Pull-out Tests
Chun, Byung-Sik ; Park, Joo-Suck ; Park, Si-Sam ; Jung, Jong-Ju ; Kong, Jin-Young ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 61~65
In this study, a newly modified soil nailing technology named as the PGSN (Pressurized Grouting Soil Nailing) system is proposed. Effects of various factors related to the design of the pressurized grouting soil nailing system, such as the length of re-bars and type of reinforcement materials, were examined throughout a series of the displacement-controlled field pull-out tests. 9 displacement-controlled field pull-out tests were performed and the ratio of injected grout volume to grout hole volume were also evaluated based on the measurements. In addition, short-term characteristics of pull-out deformations of the newly proposed PGSN system were analyzed and compared with those of the ordinary soil nailing system by carrying out field pull-out tests. The test results were shown that the displacements of pressurized grouting soil nailing system were decreased 30~36% in comparison with using gravity grouting soil nailing system by the pressurized effect. The displacements of steel tube were diminished 31~32% comparison with using deformed bar by the reinforcement type change from the field pull-out tests.
Estimation on Bearing Capacity of Waste Landfill Reinforced by Geosynthetics Using Numerical Analysis
Shin, Eun-Chul ; Park, Jeong-Jun ;
Journal of the Korean Geoenvironmental Society , volume 9, issue 2, 2008, Pages 67~74
Many industrialized countries of the world have many problems about the reuse of waste landfill area because of the increase of terminated waste disposal landfill. Especially, the effective use of the terminated waste disposal landfill nearby the urban area has been demanded, because of the lack of the usable land. However, in case of the construction of the building on such a landfill, ground settlement and reduced bearing capacity would be occurred without ground stabilization and proper reinforcement. This study is to evaluate the applicability of geosynthetics for the increment of bearing capacity of solid waste landfill ground. A numerical simulation has been undertaken to model a layer of weathered soil overlaying a layer of geosynthetic reinforcement and waste disposal ground. The proposed analytical model can be used to obtain surface settlement characteristic in the two-dimensional deformation related reinforcement.