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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
Drying Characteristics of Soil by Microwave
Cho, Doo-Hwan ; Oh, Myoung-Hak ; Park, Jun-Boum ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 5~12
Water content is one of the significant engineering properties of soil for predicting the behavior of soil matrix. Conventional drying oven can be widely used to obtain the values by drying the soil specimens for 16 to 24 hours at 105
. Although a number of experimental data has been accumulated for the conventional method of drying soil for water contents, shortcomings of the method are still hard to overcome such as long drying time for in situ use and the difficulty of taking prompt actions against emergency cases. Recently, ASTM and JGS have established microwave oven drying techniques for obtaining water contents to cope with those problems. And the reliability evaluation study has been also performed on the microwave oven drying for water contents. Feasibility study of the microwave oven drying was performed to confirm the process of the technique with Jumunjin sand, kaolinite, bentonite, weathered granite soil, and organic soil. Investigation was also conducted on the factors affecting and enhancing the reliability of the technique.
A Study on Strength Characteristics of Sand-gravel Mixtures
Park, Sung-Sik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 13~19
The strength of granular mixtures can be controlled by the majority of the mixture, fine grains. However, in some cases, the small amount of gravel in the mixture may influence the strength of the mixture. In this study, the effect of some dispersed gravels on strength of sand is evaluated. Gravels are embedded in the middle of each cemented sand layer. The size and number of embedded gravels varies. After two days curing, a series of unconfined compression tests is performed on the cemented sand with dispersed gravels. In addition to that, a series of direct shear tests is also carried out on clean sand with gravels to evaluate its friction angle. For the specimens with the same ratio of gravel weight of 7% in which gravel size and number are different, an unconfined compressive strength(UCS) of a specimen with gravels decreases up to 15% compared to a specimen without gravel and then increases with increasing gravel number. For specimens embedded with the same size of gravel, UCS decreases and then increases as a number of gravel increases. As a number of gravel increases, a friction angle of clean sand with gravels decreases up to 5
and then recovers up to that of a specimen without gravel.
A Characteristic Study of Compression Index(
) of the Deep Seabed Soft-Clay
Hong, Soon-Taek ; Lee, Seung-Ho ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 21~28
It is important to obtain detailed physical and mechanical properties of the soil for effective and economical plans and constructions of the structures located on deep seabed soft clay layer. This study is to find out the engineering properties of the seabed soft clay such as water content, initial void ratio, liquid and plastic limits, the compression index, etc., to make correlations between soil parameters, and to compare and analyze the findings with that from the previous researchers. Finally a representative correlation among the soil parameters was determined.
An Experimental Research About Settling and Consolidation Characteristic of Dredged Soil in West Coast
Lee, Seung-Ho ; Lee, Jeong-Hak ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 29~36
In this study, settling experiment was performed about cohesive and sandy soils among representative sample expected to dredge and dump for analysis of settling and consolidation characteristic. The analysis showed the definite difference between cohesive soils and sandy soils of relationships with settling and consolidation coefficient, a water content, interfacial heights. But directly after a dredged reclamation, prediction results about a initial volume change showed that cohesive soil of a water content change was decreased rapidly as time goes by, but sandy soils made no difference in a water content change. Results were compared and analyzed with the settling and consolidation coefficient and a initial settling velocity by real soil amounts for a feasibility check about test conditions applied to these experiment: we judge that test conditions are appropriate, each material by such these analyses suggests the scope of settling and consolidation coefficient, average and the representative relational formula.
Physico-Chemical Properties and Methane Production Rates for Busan Harbor Sediments
Choi, Bo-Ram ; Lee, Tae-Yoon ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 37~42
The main objective of this study was to evaluate the current condition of harbor sediments and to estimate biochemical methane potentials from the harbor sediments. Sediment samples were collected from 10 different sampling sites. Ignition loss, elemental analyses, X-ray diffraction(XRD), X-ray fluorescence(XRF) tests were conducted to determine characteristics of the sediment. All sediments had similar elemental compositions and ignition loss were 8~10%. From the conventional BMP tests for 5 samples, cumulative methane production ranged from 11.9~15.5mL methane/(g of volatile solids), which were significantly lower than that for foods and paper. However, methane production rates for sediments were 5 to 20 times faster than those for foods and paper.
The Engineering Characteristics of the Sludge Mixed Soil
Kim, Jung-Un ; Kim, Myeong-Kyun ; Bae, Woo-Seok ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 43~50
As a result of population growth and economic growth, household and industrial wastes continue to rapidly increase every year. Especially, sewage sludge produced at final stage is increasing with the constant construction and putting in good order of the sewage plant. In addition to the government's prohibition for filling up the sludge, it became more and more difficult to discharge wastes to the sea as London Dumping Convention '96 came into effect. And sewage sludge and the livestock wastes are expected to be thoroughly prohibited from discharging to the sea from 2012. So we need desperately economical and useful alternatives to compact and reuse these wastes. The purpose of this study is to evaluate the utilization of solidified sludge-soil mixture as an enhancement and covering material. To determine the proper mixed ratio of solidified sludge, this study conducted basic physical properties tests, compaction tests, uniaxial compression tests, and permeability test. It was found that the higher the ratio of solidified sludge, the lower the coefficient of permeability. Upon the results of particle size distribution, the mixed ratio of solidified sludge that meet the enhancement material condition was 59% or lower for SP granite soil and 48% or lower for SM granite soil respectively.
Heavy Metal Contamination of Soil by Wash Water of Ready Mixed Concrete
Oh, Se-Wook ; Lee, Bong-Jik ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 51~57
Generally, ready-mixed concrete(RMC) gets hardened by time, so the remaining concrete in the drum should be cleaned. But if the RMC waste water generated from this is discharged to soil without any treatment, the strong alkaline elements and heavy metals affect water and ecosystem pollution. Although about 10 to 15% of water used for cleaning in the RMC factory is discharged to soil or river, the concrete report of this affecting soil pollution has not been sufficient. Hence, in this study it was analyzed the extraction of cleaning water from RMC factories all over the country and heavy metal and pH components remaining in soil when this is penetrated to various soils having water permeability. The specimens used for the experiment are weathering soil and soils having different particle size, and it is made to be penetrated to those for 24 hours while fixed thickness of the layer is maintained. Cleaning water is divided into that before deposition treatment(sludge water) and that after deposition treatment(upper water) to be penetrated into soil, and according to the result of penetrating sludge water to soil, Cu and Mn, Fe, and Zn were found to be remained over 23 to 90%. However, it is analyzed that in upper water having deposition treatment, Cu and Mn remain as 60% or more only in weathering soil.
Characteristics of Dynamic Parameter of Sandy Soil According to Grout Injection Ratio
Ahn, Kwang-Kuk ; Park, Jun-Young ; Oh, Jong-Geun ; Lee, Jun-Dae ; Han, Ki-Hwan ;
Journal of the Korean Geoenvironmental Society , volume 12, issue 5, 2011, Pages 59~63
Ground dynamic parameter such as shear elastic modulus and damping ratio is a very important variable in design of ground-structure with repeated load and dynamic load. Shear elastic modulus and damping ratio on small strain below linear limit strain is constant regardless of strain. Shear elastic modulus as the maximum shear elastic modulus and damping ratio as the minimum damping ratio were considered. As a lot of experiment related to the maximum shear elastic modulus, which is in dynamic deformation characteristics, have been conducted, many factors including voiding ratio, over consolidation ratio(OCR), confining pressure, geology time, PI, and the number of load cycle affect to dynamic soil characteristic. However, the research of ground dynamic characteristic improved with grout is absent such as underground continuous wall construction, deep mixing method, umbrella arch method. In order to investigate the dynamic soil characteristics improved with grout, in this study, resonant column tests were performed with changing water content(20%, 25%, 30%) and injection ratio of grout(5%, 10%, 15%), cure time(7th day, 28th day) As a result, shear elastic modulus and damping ratio, which are ground dynamic parameter, are affected by the injection ratio of milk grout, cure time and water content.